Specifications | Emerson 848T Satellite Radio User Manual

Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T High Density Temperature
Transmitter with FOUNDATION™ fieldbus
Device Revision 7
www.rosemount.com
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Rosemount 848T High Density
Temperature Transmitter with
FOUNDATION fieldbus
NOTICE
Read this manual before working with the product. For personal and system safety, and for
optimum product performance, make sure to thoroughly understand the contents before
installing, using, or maintaining this product.
The United States has two toll-free assistance numbers and one international number.
Customer Central
1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)
National Response Center
1-800-654-7768 (24 hours a day)
Equipment service needs
International
1-(952) 906-8888
The products described in this document are NOT designed for nuclear-qualified
applications.
Using non-nuclear qualified products in applications that require nuclear-qualified hardware
or products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact an Emerson Process
Management Sales Representative.
www.rosemount.com
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table of Contents
SECTION 1
Introduction
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
SECTION 2
Installation
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Mounting to a DIN Rail Without an Enclosure . . . . . . . . . . . . . . . . 2-2
Mounting to a Panel with a Junction Box . . . . . . . . . . . . . . . . . . . . 2-2
Mounting to a 2-in. Pipe Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Surges/Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Using Cable Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Using Conduit Entries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
SECTION 3
Configuration
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Transmitter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Custom Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Configure the Differential Sensors . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Configure Measurement Validation . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Common Configurations for High Density Applications . . . . . . . . . . . . 3-4
Interfacing Analog Transmitters to Foundation fieldbus . . . . . . . . . 3-6
Block Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
PlantWeb™ Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Recommended Actions for PlantWeb Alerts . . . . . . . . . . . . . . . . 3-14
Transducer Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Transducer Block Sub-Parameter Tables . . . . . . . . . . . . . . . . . . 3-20
TOC-1
Reference Manual
Rosemount 848T
00809-0100-4697, Rev EA
October 2011
SECTION 4
Operation and
Maintenance
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Foundation fieldbus Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Commissioning (Addressing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Sensor Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Communication/Power Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Resetting the Configuration (RESTART) . . . . . . . . . . . . . . . . . . . . 4-3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Foundation fieldbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Transducer Block Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . 4-4
APPENDIX A
Reference Data
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
APPENDIX B
Product Certificates
Hazardous Locations Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
North American Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
European Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Intrinsically Safe and Non-Incendive Installations . . . . . . . . . . . . . . . B-11
Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12
APPENDIX C
Foundation™ fieldbus
Technology
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1
Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1
Device Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3
Block Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3
Instrument- Specific Function Blocks . . . . . . . . . . . . . . . . . . . . . . .C-3
Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3
Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4
Link Active Scheduler (LAS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4
Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6
Scheduled Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6
Unscheduled Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-7
Function Block Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-8
APPENDIX D
Function Blocks
Analog Input (AI) Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1
Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-3
AI Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-8
Multiple Analog Input (MAI) Function Block. . . . . . . . . . . . . . . . . . . . .D-9
Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-10
MAI Block Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-14
Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-15
Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-17
ISEL Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-20
TOC-2
Reference Manual
00809-0100-4697, Rev EA
October 2011
Section 1
Rosemount 848T
Introduction
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-3
SAFETY MESSAGES
Instructions and procedures in this section may require special precautions to
ensure the safety of the personnel performing the operations. Information that
potentially raises safety issues is indicated by a warning symbol ( ). Please
refer to the following safety messages before performing an operation
preceded by this symbol.
Warnings
Failure to follow these installation guidelines could result in death or
serious injury.
•
Make sure only qualified personnel perform the installation.
Process leaks could result in death or serious injury.
•
Do not remove the thermowell while in operation. Removing while in operation may
cause process fluid leaks.
•
Install and tighten thermowells and sensors before applying pressure, or process
leakage may result.
Electrical shock could cause death or serious injury.
www.rosemount.com
•
If the sensor is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on transmitter leads and
terminals.
•
Use extreme caution when making contact with the leads and terminals.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
OVERVIEW
Transmitter
The Rosemount 848T is optimal for process temperature measurement
because of its ability to simultaneously measure eight separate and
independent temperature points with one transmitter. Multiple temperature
sensor types may be connected to each 848T transmitter. In addition, the
848T can accept 4-20 mA inputs. The enhanced measurement capability of
the 848T allows it to communicate these variables to any FOUNDATION
fieldbus host or configuration tool.
Manual
This manual is designed to assist in the installation, operation, and
maintenance of the Rosemount 848T Temperature Transmitter.
Section 1: Introduction
• Overview
• Considerations
• Return of Materials
Section 2: Installation
• Mounting
• Installation
• Wiring
• Power Supply
• Commissioning
Section 3: Configuration
• FOUNDATION fieldbus Technology
• Configuration
• Function Block Configuration
Section 4: Operation and Maintenance
• Hardware Maintenance
• Troubleshooting
Appendix A: Specification and Reference Data
• Specifications
• Dimensional Drawings
• Ordering Information
Appendix B: Product Certificates
• Hazardous Locations Certificates
• Intrinsically Safe and Non-Incendive Installations
• Installation Drawings
Appendix C: Foundation™ Fieldbus Technology
•
Device Descriptions
•
Block Operation
Appendix D: Function Blocks
• Analog Input (AI) Function Block
• Multiple Analog Input (MAI) Function Block
• Input Selector Function Block
1-2
Reference Manual
00809-0100-4697, Rev EA
October 2011
SERVICE SUPPORT
Rosemount 848T
To expedite the return process in North America, call the Emerson Process
Management National Response Center toll-free at 800-654-7768. This
center, available 24 hours a day, will assist with any needed information or
materials.
The center will ask for the following information:
•
Product model
•
Serial numbers
•
The last process material to which the product was exposed
The center will provide
•
A Return Material Authorization (RMA) number
•
Instructions and procedures that are necessary to return goods that
were exposed to hazardous substances
For other locations, please contact an Emerson Process Management sales
representative.
NOTE
If a hazardous substance is identified, a Material Safety Data Sheet (MSDS),
required by law to be available to people exposed to specific hazardous
substances, must be included with the returned materials.
1-3
Reference Manual
Rosemount 848T
1-4
00809-0100-4697, Rev EA
October 2011
Reference Manual
00809-0100-4697, Rev EA
October 2011
Section 2
Rosemount 848T
Installation
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-8
Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-10
Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-11
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-12
SAFETY MESSAGES
Instructions and procedures in this section may require special precautions to
ensure the safety of the personnel performing the operations. Information that
potentially raises safety issues is indicated by a warning symbol ( ). Please
refer to the following safety messages before performing an operation
preceded by this symbol.
Warnings
Failure to follow these installation guidelines could result in death or
serious injury.
•
Make sure only qualified personnel perform the installation.
Process leaks could result in death or serious injury.
•
Do not remove the thermowell while in operation. Removing while in operation may
cause process fluid leaks.
•
Install and tighten thermowells and sensors before applying pressure, or process
leakage may result.
Electrical shock could cause death or serious injury.
MOUNTING
www.rosemount.com
•
If the sensor is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on transmitter leads and
terminals.
•
Use extreme caution when making contact with the leads and terminals.
The 848T is always mounted remote from the sensor assembly. There are
three mounting configurations:
•
To a DIN rail without an enclosure
•
To a panel with an enclosure
•
To a 2-in pipe stand with an enclosure using a pipe mounting kit
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Mounting to a DIN Rail
Without an Enclosure
To mount the 848T to a DIN rail without an enclosure, follow these steps:
1.
Pull up the DIN rail mounting clip located on the top back side of the
transmitter.
2.
Hinge the DIN rail into the slots on the bottom of the transmitter.
3.
Tilt the 848T and place onto the DIN rail. Release the mounting clip.
The transmitter should be securely fastened to the DIN rail.
Figure 2-1. Mounting the 848T
to a DIN Rail
848T without
installed
enclosure
DIN Rail
DIN Rail Mounting Clip
Mounting to a Panel with
a Junction Box
When inside of a plastic or aluminum junction box, the 848T mounts to a
panel using four 1/4-20 x 1.25-in. screws.
When inside of a stainless steel junction box, the 848T mounts to a panel
using two 1/4-20 x 1/2-in. screws.
Figure 2-2. Mounting the 848T
junction box to a panel
Aluminum/Plastic
Stainless Steel
848T with aluminum or plastic box
Cover
Screws (4)
848T with a stainless steel box
Mounting
Screws (2)
Mounting
Screws (4)
Panel
2-2
Panel
Reference Manual
00809-0100-4697, Rev EA
October 2011
Mounting to a 2-in.
Pipe Stand
Rosemount 848T
Use the optional mounting bracket (option code B6) to mount the 848T to a
2-in. pipe stand when using a junction box.
Aluminum/Plastic Junction Box
(styles JA and JP)
Front View
5.1
(130)
10.2
(260)
Side View
6.6 (167)
fully
assembled
Stainless Steel Junction Box
(style JS)
Front View
4.7
(119)
Side View
7.5 (190)
fully
assembled
Dimensions are in inches (millimeters)
Aluminum/Plastic Junction Box
Mounted on a Vertical Pipe
Stainless Steel Junction Box
Mounted on a Vertical Pipe
2-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
WIRING
If the sensor is installed in a high-voltage environment and a fault condition or
installation error occurs, the sensor leads and transmitter terminals could
carry lethal voltages. Use extreme caution when making contact with the
leads and terminals.
NOTE
Do not apply high voltage (e.g. AC line voltage) to the transmitter terminals.
Abnormally high voltage can damage the unit (bus terminals are rated to 42.4
VDC).
Figure 2-3. 848T Transmitter
Field Wiring
6234 ft (1900 m) max
(depending upon cable
characteristics)
Integrated Power
Conditioner
and Filter
Terminators
(Trunk)
(Spur)
(Spur)
Power
Supply
FOUNDATION
fieldbus Host or
configuration tool
Signal
Wiring
Devices 1 through 16*
* Intrinsically safe installations may allow fewer devices per I.S. barrier
Connections
The 848T transmitter is compatible with 2 or 3-wire RTD, thermocouple, Ohm,
and millivolt sensor types. Figure 2-4 shows the correct input connections to
the sensor terminals on the transmitter. The 848T can also accept inputs from
analog devices using the optional analog input connector. Figure 2-5 shows
the correct input connections to the analog input connector when installed on
the transmitter. Tighten the terminal screws to ensure proper connection.
Figure 2-4. Sensor Wiring
Diagram
1 2 3
2-wire
RTD and
Ohms
*
**
2-4
1 2 3
3-wire
RTD and
Ohms*
1 2 3
Thermocouples /
Ohms and
Millivolts
1 2 3
2-Wire RTD
with
Compensation
Loop**
Emerson Process Management provides 4-wire sensors for all single-element RTDs. Use these
RTDs in 3-wire configurations by clipping the fourth lead or leaving it disconnected and insulated
with electrical tape.
The transmitter must be configured for a 3-wire RTD in order to recognize an RTD with a
compensation loop.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
RTD or Ohm Inputs
Various RTD configurations, including 2-wire and 3-wire are used in industrial
applications. If the transmitter is mounted remotely from a 3-wire RTD, it will
operate within specifications, without recalibration, for lead wire resistances of
up to 60 ohms per lead (equivalent to 6,000 feet of 20 AWG wire). If using a
2-wire RTD, both RTD leads are in series with the sensor element, so errors
can occur if the lead lengths exceed one foot of 20 AWG wire. Compensation
for this error is provided when using 3-wire RTDs.
Thermocouple or Millivolt Inputs
Use appropriate thermocouple extension wire to connect the thermocouple to
the transmitter. Make connections for millivolt inputs using copper wire. Use
shielding for long runs of wire.
Analog Inputs
The analog connector converts the 4–20 mA signal to a 20–100 mV signal
that can be read by the 848T and transmitted using FOUNDATION fieldbus.
Use the following steps when installing the 848T with the analog connector:
1. The 848T, when ordered with option code S002, comes with four analog
connectors. Replace the standard connector with the analog connector
on the desired channels.
2. Wire one or two analog transmitters to the analog connector according to
Figure 2-5. There is space available on the analog connector label for
identification of the analog inputs.
NOTE
Power supply should be rated to support the connected transmitter(s).
3. If the analog transmitters can communicate using HART protocol, the
analog connectors are supplied with the ability to switch in a 250 ohm
resistor for HART communication (see Figure 2-6).
One switch is supplied for each input (top switch for “A” inputs and
bottom switch for “B” inputs). Setting the switch in the “ON” position (to
the right) bypasses the 250 ohm resistor. Terminals are provided for each
analog input to connect a Field Communicator for local configuration.
2-5
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Figure 2-5. 848T Analog Input
Wiring Diagram
Analog Input
Connectors
Analog Transmitters
Power Supply
Figure 2-6. 848T Analog
Connector
250 ohm resistor in the loop when switched to the left
HART
Channel B
HART
Channel A
Space available for
identification of inputs
2-6
Reference Manual
00809-0100-4697, Rev EA
October 2011
Power Supply
Rosemount 848T
Connections
The transmitter requires between 9 and 32 VDC to operate and provide
complete functionality. The DC power supply should provide power with less
than 2% ripple. A fieldbus segment requires a power conditioner to isolate the
power supply filter and decouple the segment from other segments attached
to the same power supply.
All power to the transmitter is supplied over the signal wiring. Signal wiring
should be shielded, twisted pair for best results in electrically noisy
environments. Do not use unshielded signal wiring in open trays with power
wiring or near heavy electrical equipment.
Use ordinary copper wire of sufficient size to ensure that the voltage across the
transmitter power terminals does not go below 9 VDC. The power terminals are
polarity insensitive. To power the transmitter:
1.
Connect the power leads to the terminals marked “Bus,” as shown in
Figure 2-7.
2.
Tighten the terminal screws to ensure adequate contact. No
additional power wiring is necessary.
Figure 2-7. Transmitter Label
NOT USED
SECURITY
SIMULATE ENABLE
Ground
(required with T1 option)
Connect Power Leads Here
Surges/Transients
The transmitter will withstand electrical transients encountered through static
discharges or induced switching transients. However, a transient protection
option (option code T1) is available to protect the 848T against high-energy
transients. The device must be properly grounded using the ground terminal
(see Figure 2-7).
2-7
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
GROUNDING
The 848T transmitter provides input/output isolation up to 620 V rms.
NOTE
Neither conductor of the fieldbus segment can be grounded. Grounding out
one of the signal wires will shut down the entire fieldbus segment.
Shielded Wire
Each process installation has different requirements for grounding. Use the
grounding options recommended by the facility for the specific sensor type or
begin with grounding option 1 (most common).
Ungrounded Thermocouple, mV, and RTD/Ohm Inputs
Option 1:
1.
Connect signal wiring shield to the sensor wiring shield(s).
2.
Ensure the shields are tied together and electrically isolated from the
transmitter enclosure.
3.
Only ground shield at the power supply end.
4.
Ensure that the sensor shield(s) is electrically isolated from the
surrounding grounded fixtures.
848T
Power
Supply
Sensor Wires
Shield ground point
Option 2:
1.
Connect sensor wiring shield(s) to the transmitter enclosure (only if
the enclosure is grounded).
2.
Ensure the sensor shield(s) is electrically isolated from surrounding
fixtures that may be grounded.
3.
Ground signal wiring shield at the power supply end.
848T
Power
Supply
Sensor Wires
Shield ground points
2-8
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Grounded Thermocouple Inputs
1.
Ground sensor wiring shield(s) at the sensor.
2.
Ensure that the sensor wiring and signal wiring shields are electrically
isolated from the transmitter enclosure.
3.
Do not connect the signal wiring shield to the sensor wiring shield(s).
4.
Ground signal wiring shield at the power supply end.
Power
Supply
848T
Sensor Wires
Shield ground points
Analog Device Inputs
1.
Ground analog signal wire at the power supply of the analog devices.
2.
Ensure that the analog signal wire and the fieldbus signal wire shields
are electrically isolated from the transmitter enclosure.
3.
Do not connect the analog signal wire shield to the fieldbus signal
wire shield.
4.
Ground fieldbus signal wire shield at the power supply end.
FOUNDATION
fieldbus bus
4-20 mA loop
Analog Device
Power Supply
Analog
Device
848T
Power
Supply
Shield ground points
Transmitter Enclosure (optional)
Ground the transmitter in accordance with local electrical requirements.
2-9
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
SWITCHES
Figure 2-8. Switch Location on
the Rosemount 848T
NOT USED
SECURITY
SIMULATE ENABLE
Security
After configuring the transmitter, the data can be protected from unwarranted
changes. Each 848T is equipped with a security switch that can be positioned
“ON” to prevent the accidental or deliberate change of configuration data.
This switch is located on the front side of the electronics module and
is labeled SECURITY.
See Figure 2-8 for switch location on the transmitter label.
Simulate Enable
The switch labeled SIMULATE ENABLE is used in conjunction with the
Analog Input (AI) and Multiple Analog Input (MAI) function blocks. This switch
is used to simulate temperature measurement.
Not Used
The switch is not functional.
2-10
Reference Manual
00809-0100-4697, Rev EA
October 2011
TAGGING
Rosemount 848T
Commissioning Tag
The 848T has been supplied with a removable commissioning tag that
contains both the Device ID (the unique code that identifies a particular device
in the absence of a device tag) and a space to record the device tag (the
operational identification for the device as defined by the Piping and
Instrumentation Diagram (P&ID)).
When commissioning more than one device on a fieldbus segment, it can be
difficult to identify which device is at a particular location. The removable tag,
provided with the transmitter, can aid in this process by linking the Device ID
to its physical location. The installer should note the physical location of the
transmitter on both the upper and lower location of the commissioning tag.
The bottom portion should be torn off for each device on the segment and
used for commissioning the segment in the control system.
Figure 2-9. Commissioning Tag
Device ID
Device Tag
to denote
physical
location
Transmitter Tag
Hardware
• Tagged in accordance with customer requirements
• Permanently attached to the transmitter
Software
• The transmitter can store up to 32 characters
• If no characters are specified, the first 30 characters of the hardware tag
will be used
Sensor Tag
Hardware
• A plastic tag is provided to record identification of eight sensors
• This information can be printed at the factory upon request
• In the field, the tag can be removed, printed onto, and reattached to the
transmitter
Software
• If sensor tagging is requested, the Transducer Block SERIAL_NUMBER
parameters will be set at the factory
• The SERIAL_NUMBER parameters can be updated in the field
2-11
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
INSTALLATION
Using Cable Glands
Use the following steps to install the 848T with Cable Glands:
1.
Remove the junction box cover by unscrewing the four cover screws.
2.
Run the sensor and power/signal wires through the appropriate cable
glands using the pre-installed cable glands (see Figure 2-10).
3.
Install the sensor wires into the correct screw terminals (follow the
label on the electronics module).
4.
Install the power/signal wires onto the correct screw terminals. Power
is polarity insensitive, allowing the user to connect positive (+) or
negative (–) to either Fieldbus wiring terminal labeled “Bus.”
5.
Replace the enclosure cover and securely tighten all cover screws.
Figure 2-10. Installing the 848T
with Cable Glands
Enclosure Cover
Screw (4)
Sensor 7
Sensor 5
Sensor 3
Sensor 1
Power/Signal
Cable Gland
Using Conduit Entries
Use the following steps to install the 848T with Conduit Entries:
1.
Remove the junction box cover by unscrewing the four cover screws.
2.
Remove the five conduit plugs and install five conduit fittings
(supplied by the installer).
3.
Run pairs of sensor wires through each conduit fitting.
4.
Install the sensor wires into the correct screw terminals (follow the
label on the electronics module).
5.
Install the power/signal wires into the correct screw terminals. Power
is polarity insensitive, allowing the user to connect positive (+) or
negative (–) to either Fieldbus wiring terminal labeled “Bus.”
6.
Replace the junction box cover and securely tighten all cover screws.
Figure 2-11. Installing the 848T
with Conduit Entries
Sensor 3 and 4 Conduit
Enclosure
Cover Screw
2-12
Sensor 8
Sensor 6
Sensor 4
Sensor 2
Sensors
1 and 2
Conduit
Sensor 7 and 8 Conduit
Sensor
5 and 6
Conduit
Power/Signal
Conduit
Reference Manual
00809-0100-4697, Rev EA
October 2011
Section 3
Rosemount 848T
Configuration
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-2
Common Configurations for High Density Applications page 3-4
Block Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-7
SAFETY MESSAGES
Instructions and procedures in this section may require special precautions to
ensure the safety of the personnel performing the operations. Information that
potentially raises safety issues is indicated by a warning symbol ( ). Please
refer to the following safety messages before performing an operation
preceded by this symbol.
Warnings
Failure to follow these installation guidelines could result in death or
serious injury.
•
Make sure only qualified personnel perform the installation.
Process leaks could result in death or serious injury.
•
Do not remove the thermowell while in operation. Removing while in operation may
cause process fluid leaks.
•
Install and tighten thermowells and sensors before applying pressure, or process
leakage may result.
Electrical shock could cause death or serious injury.
www.rosemount.com
•
If the sensor is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on transmitter leads and
terminals.
•
Use extreme caution when making contact with the leads and terminals.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
CONFIGURATION
Standard
Each FOUNDATION fieldbus configuration tool or host system has a different
way of displaying and performing configurations. Some will use Device
Descriptions (DDs) and DD Methods to make configuration and displaying of
data consistent across host platforms.
Unless otherwise specified, the 848T will be shipped with the following
configuration (default):
Table 3-1. Standard
Configuration Settings
Sensor Type(1)
Damping(1)
Measurement Units(1)
Output(1)
Line Voltage Filter(1)
Temperature Specific Blocks
FOUNDATION fieldbus Function Blocks
Type J Thermocouple
5 seconds
°C
Linear with Temperature
60 Hz
• Transducer Block (1)
• Analog Input (8)
• Multiple Analog Input (2)
• Input Selector (4)
(1) For all eight sensors
Refer to that systems documentation to perform configuration changes using
a FOUNDATION fieldbus host or configuration tool.
NOTE
To make configuration changes, ensure that the block is Out of Service (OOS)
by setting the MODE_BLK.TARGET to OOS, or set the SENSOR_MODE to
Configuration.
Transmitter
Configuration
The transmitter is available with the standard configuration setting. The
configuration settings and block configuration may be changed in the field
with the Emerson Process Management Systems DeltaV®, with AMSinside, or
other FOUNDATION fieldbus host or configuration tool.
Custom Configuration
Custom configurations are to be specified when ordering.
Methods
For FOUNDATION fieldbus hosts or configuration tools that support device
description (DD) methods, there are two configuration methods available in
the Transducer block. These methods are included with the DD software.
•
Sensor Configuration
•
Sensor Input Trim (user input trim)
See the host system documentation for information on running DD methods
from the host system. If the FOUNDATION fieldbus host or configuration tool
does not support DD methods, refer to “Block Configuration” on page 3-7 for
information on how to modify sensor configuration parameters.
3-2
Reference Manual
00809-0100-4697, Rev EA
October 2011
Alarms
Rosemount 848T
Use the following steps to configure the alarms, which are located in the
Resource Function Block.
1.
Set the resource block to OOS.
2.
Set WRITE_PRI to the appropriate alarm level (WRITE_PRI has a
selectable range of priorities from 0 to 15, see “Alarm Priority Levels”
on page 3-11. Set the other block alarm parameters at this time.
3.
Set CONFIRM_TIME to the time, in 1/32 of a millisecond, that the
device will wait for confirmation of receiving a report before trying
again (the device does not retry if CONFIRM_TIME is 0).
4.
Set LIM_NOTIFY to a value between zero and MAX_NOTIFY.
LIM_NOTIFY is the maximum number of alert reports allowed before
the operator needs to acknowledge an alarm condition.
5.
Enable the reports bit in FEATURES_SEL. (When Multi-bit alerts is
enabled, every active alarm is visible for any of the eight sensors,
generated by a PlantWeb alert. This is different than only viewing the
highest priority alarm.)
6.
Set the resource block to AUTO.
For modifying alarms on individual function blocks (AI or ISEL blocks), refer to
Appendix D: Function Blocks.
Damping
Configure the Differential
Sensors
Configure Measurement
Validation
Use the following steps to configure the damping, which is located in the
Transducer Function Block.
1.
Set Sensor Mode to Out of Service.
2.
Change DAMPING to the desired filter rate (0.0 to 32.0 seconds).
3.
Set Sensor Mode to In Service.
Use the following steps to configure the Differential Sensors:
1.
Set Dual Sensor Mode to Out of Service.
2.
Set Input A and Input B to the sensor values that are to be used in the
differential equation diff = A–B. (NOTE: Unit types must be the same.)
3.
Set the DUAL_SENSOR_CALC to either Not Used, Absolute, or
INPUT A minus INPUT B.
4.
Set Dual Sensor Mode to In Service.
Use the following steps to configure Measurement Validation:
1.
Set mode to Disabled for specific sensor.
2.
Select sample rate. 1-10 sec/sample is available. 1 second/sample is
preferred for sensor degradation. The higher the number of seconds
between samples, the more emphasis put on process variation.
3.
Select Deviation Limit from 0 to 10 units. If deviation limit is exceeded,
a status event will be triggered.
4.
Select Increasing Limit. Sets the limit for increasing rate of change. If
limit is exceeded, a status event will be triggered.
5.
Select Decreasing Limit. Sets the limit for decreasing rate of change.
If limit is exceeded, a status event will be triggered.
NOTE:
The decreasing limit selected is required to be a negative value.
3-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
COMMON
CONFIGURATIONS FOR
HIGH DENSITY
APPLICATIONS
6.
Set the Deadband from 0 to 90%. This threshold is used to clear the
PV status.
7.
Set Status Priority. This determines what happens when the specific
limit has been exceeded. No Alert - Ignores limit settings. Advisory Sets Advisory Plant Web Alert, but does not do anything with PV
status. Warning - Sets a Maintenance Plant Web Alert and sets PV
status to uncertain. Failure - Sets A Failure Plant Web Alert and sets
PV status to Bad.
8.
Set mode to Enabled for specific sensor.
For the application to work properly, configure the links between the function
blocks and schedule the order of their execution. The Graphical User
Interface (GUI) provided by the FOUNDATION fieldbus host or configuration tool
will allow easy configuration.
The measurement strategies shown in this section represent some of the
common types of configurations available in the 848T. Although the
appearance of the GUI screens will vary from host to host, the configuration
logic is the same.
NOTE
Please ensure that the host system or configuration tool is properly configured
before downloading the transmitter configuration. If configured improperly, the
FOUNDATION fieldbus host or configuration tool could overwrite the default
transmitter configuration.
Typical Profiling Application
Example: Distillation column temperature profile where all channels have the
same sensor units (°C, °F, etc.).
Out_1
Out_2
Out_3
1.
Place the Multiple Analog Input (MAI) function block in OOS mode
(set MODE_BLK.TARGET to OOS).
2.
Set CHANNEL= “channels 1 to 8.” Although the CHANNEL_X
parameters remain writable, CHANNEL_X can only be set = X when
CHANNEL=1.
3.
Set L_TYPE to direct or indirect.
4.
Set XD_SCALE (transducer measurement scaling) to the appropriate
upper and lower range values, the appropriate sensor units, and
display decimal point.
5.
Set OUT_SCALE (MAI output scaling) to the appropriate upper and
lower range values, the appropriate sensor units, and display decimal
point.
Out_4
Out_5
MAI
Function
Block
Out_6
Out_7
Out_8
3-4
6.
Place the MAI Function Block in auto mode.
7.
Verify that the function blocks are scheduled.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Monitoring Application with a Single Selection
Example: Average exhaust temperature of gas and turbine where there is a
single alarm level for all inputs.
IN_1
Out
Out_2
IN_2
Out_D
Out_3
IN_3
Out_4
IN_4
Out_5
IN_5
Out_6
IN_6
Out_7
IN_7
Out_8
IN_8
Out_1
MAI
Function
Block
ISEL
Function
Block
1.
Link the MAI outputs to the ISEL inputs.
2.
Place the Multiple Analog Input (MAI) function block in OOS mode
(set MODE_BLK.TARGET to OOS).
3.
Set CHANNEL= “channels 1 to 8.” Although the CHANNEL_X
parameters remain writable, CHANNEL_X can only be set = X when
CHANNEL=1.
4.
Set L_TYPE to direct or indirect.
5.
Set XD_SCALE (transducer measurement scaling) to the appropriate
upper and lower range values, the appropriate sensor units, and
display decimal point.
6.
Set OUT_SCALE (MAI output scaling) to the appropriate upper and
lower range values, the appropriate sensor units, and display decimal
point.
7.
Place the MAI function block in auto mode.
8.
Place the Input Selector (ISEL) function block in OOS mode by
setting MODE_BLK.TARGET to OOS.
9.
Set OUT_RANGE to match the OUT_SCALE in the MAI block.
10. Set SELECT_TYPE to the desired function (Maximum Value,
Minimum Value, First Good Value, Midpoint Value, or Average Value).
11. Set the alarm limits and parameters if necessary.
12. Place the ISEL function block in auto mode.
13. Verify that the function blocks are scheduled.
Measuring Temperature Points Individually
Example: Miscellaneous monitoring of temperature in a “close proximity”
where each channel can have different sensor inputs with different units and
there are independent alarm levels for each input.
Out
AI
Function
Block 1
Out_D
Out
AI
Function
Block 8
1.
Place the first Analog Input (AI) function block in OOS mode (set
MODE_BLK.TARGET to OOS).
2.
Set CHANNEL to the appropriate channel value. Refer to “Alarm
Priority Levels” on page 3-11 for a listing of channel definitions.
3.
Set L_TYPE to direct.
4.
Set XD_SCALE (transducer measurement scaling) to the appropriate
upper and lower range values, the appropriate sensor units, and
display decimal point.
5.
Set OUT_SCALE (AI output scaling) to the appropriate upper and
lower range values, the appropriate sensor units, and display decimal
point.
6.
Set the alarm limits and parameters if necessary.
7.
Place the AI function block in auto mode.
8.
Repeat steps 1 through 7 for each AI function block.
9.
Verify that the function blocks are scheduled.
Out_D
3-5
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Interfacing Analog
Transmitters to
FOUNDATION fieldbus
Transducer Block Configuration
Use the sensor configuration method to set the sensor type to mV – 2-wire for
the applicable transducer block or follow these steps.
1.
Set the MODE_BLK.TARGET to OOS mode, or set the
SENSOR_MODE to configuration.
2.
Set the SENSOR to mV.
3.
Set the MODE_BLK.TARGET to AUTO, or set the SENSOR_MODE
to operation.
Multiple Analog Input or Analog Input Block Configuration
Follow these steps to configure the applicable block.
3-6
1.
Set the MODE_BLK.TARGET to OOS mode, or set the
SENSOR_MODE to configuration.
2.
Set CHANNEL to the transducer block configured for the analog
input.
3.
Set XD_SCALE.EU_0 to 20
Set XD_SCALE.EU_100 to 100
Set XD_SCALE.ENGUNITS to mV
4.
SET OUT_SCALE to match the desired scale and units for the
connected analog transmitter.
Flow Example: 0 – 200 gpm
OUT_SCALE.EU_0 = 0
OUT_SCALE.EU_100 = 200
OUT_SCALE.ENGUNITS = gpm
5.
Set L_TYPE to INDIRECT.
6.
Set the MODE_BLK.TARGET to AUTO, or set the SENSOR_MODE
to operation.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
BLOCK
CONFIGURATION
Resource Block
The resource block defines the physical resources of the device including
type of measurement, memory, etc. The resource block also defines
functionality, such as shed times, that is common across multiple blocks.
The block has no linkable inputs or outputs and it performs
memory-level diagnostics.
Table 3-2. Resource Block Parameters
Number
Parameter
Description
01
02
03
04
05
ST_REV
TAG_DESC
STRATEGY
ALERT_KEY
MODE_BLK
06
BLOCK_ERR
07
RS_STATE
08
09
TEST_RW
DD_RESOURCE
10
MANUFAC_ID
11
DEV_TYPE
12
DEV_REV
13
DD_REV
14
GRANT_DENY
15
HARD_TYPES
16
17
RESTART
FEATURES
18
19
FEATURE_SEL
CYCLE_TYPE
20
21
22
CYCLE_SEL
MIN_CYCLE_T
MEMORY_SIZE
23
NV_CYCLE_T
24
25
26
FREE_SPACE
FREE_TIME
SHED_RCAS
27
SHED_ROUT
The revision level of the static data associated with the function block.
The user description of the intended application of the block.
The strategy field can be used to identify grouping of blocks.
The identification number of the plant unit.
The actual, target, permitted, and normal modes of the block. For further description, see the
Mode parameter formal model in FF-890.
This parameter reflects the error status associated with the hardware or software components
associated with a block. Multiple errors may be shown. For a list of enumeration values, see
FF-890, Block_Err formal model.
State of the function block application state machine. For a list of enumeration values, see
FF-890.
Read/write test parameter - used only for conformance testing.
String identifying the tag of the resource which contains the Device Description for the
resource.
Manufacturer identification number - used by an interface device to locate the DD file for the
resource.
Manufacturer's model number associated with the resource - used by interface devices to
locate the DD file for the resource.
Manufacturer revision number associated with the resource - used by an interface device to
locate the DD file for the resource.
Revision of the DD associated with the resource - used by the interface device to locate the
DD file for the resource.
Options for controlling access of host computer and local control panels to operating, tuning
and alarm parameters of the block.
The types of hardware available as channel numbers. The supported hardware type is:
SCALAR_INPUT
Allows a manual restart to be initiated.
Used to show supported resource block options. The supported features are: Unicode,
Reports, Soft_Write_Lock, Hard_Write_Lock, and Multi-Bit Alarms.
Used to select resource block options.
Identifies the block execution methods available for this resource. The supported cycle types
are: SCHEDULED, and COMPLETION_OF_BLOCK_EXECUTION
Used to select the block execution method for this resource.
Time duration of the shortest cycle interval of which the resource is capable.
Available configuration memory in the empty resource. To be checked before attempting a
download.
Minimum time interval specified by the manufacturer for writing copies of NV parameters to
non-volatile memory. Zero means it will never be automatically copied. At the end of
NV_CYCLE_T, only those parameters which have changed need to be updated in NVRAM.
Percent of memory available for further configuration. Zero in preconfigured resource.
Percent of the block processing time that is free to process additional blocks.
Time duration at which to give up on computer writes to function block RCas locations. Shed
from RCas will never happen when SHED_RCAS = 0.
Time duration at which to give up on computer writes to function block ROut locations. Shed
from ROut will never happen when SHED_ROUT = 0.
3-7
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-2. Resource Block Parameters
Number
3-8
Parameter
28
FAULT_STATE
29
30
SET_FSTATE
CLR_FSTATE
31
32
33
MAX_NOTIFY
LIM_NOTIFY
CONFIRM_TIME
34
WRITE_LOCK
35
36
UPDATE_EVT
BLOCK_ALM
37
ALARM_SUM
38
39
40
41
ACK_OPTION
WRITE_PRI
WRITE_ALM
ITK_VER
42
43
DISTRIBUTOR
DEV_STRING
44
45
46
47
48
49
50
51
XD_OPTIONS
FB_OPTIONS
DIAG_OPTIONS
MISC_OPTIONS
RB_SFTWR_REV_MAJOR
RB_SFTWR_REV_MINOR
RB_SFTWR_REV_BUILD
RB_SFTWR_REV_ALL
52
53
54
55
HARDWARE_REV
OUTPUT_BOARD_SN
FINAL_ASSY_NUM
DETAILED_STATUS
56
57
58
SUMMARY_STATUS
MESSAGE_DATE
MESSAGE_TEXT
59
SELF_TEST
Description
Condition set by loss of communication to an output block, fault promoted to an output block
or physical contact. When FAIL_SAFE condition is set, then output function blocks will
perform their FAIL_SAFE actions.
Allows the FAIL_SAFE condition to be manually initiated by selecting Set.
Writing a Clear to this parameter will clear the device FAIL_SAFE if the field condition has
cleared.
Maximum number of unconfirmed notify messages possible.
Maximum number of unconfirmed alert notify messages allowed.
The time the resource will wait for confirmation of receipt of a report before trying again. Retry
will not happen when CONFIRM_TIME=0.
If set, all writes to static and non-volatile parameters are prohibited, except to clear
WRITE_LOCK. Block inputs will continue to be updated.
This alert is generated by any change to the static data.
The BLOCK_ALM is used for all configuration, hardware, connection failure or system
problems in the block. The cause of the alert is entered in the subcode field. The first alert to
become active will set the Active status in the Status attribute. As soon as the Unreported
status is cleared by the alert reporting task, another block alert may be reported without
clearing the Active status, if the subcode has changed.
The current alert status, unacknowledged states, unreported states, and disabled states of
the alarms associated with the function block.
Selection of whether alarms associated with the block will be automatically acknowledged.
Priority of the alarm generated by clearing the write lock.
This alert is generated if the write lock parameter is cleared.
Major revision number of the interoperability test case used in certifying this device as
interoperable. The format and range are controlled by the Fieldbus FOUNDATION.
Reserved for use as distributor ID. No FOUNDATION enumerations defined at this time.
This is used to load new licensing into the device. The value can be written but will always
read back with a value of 0.
Indicates which transducer block licensing options are enabled.
Indicates which function block licensing options are enabled.
Indicates which diagnostics licensing options are enabled.
Indicates which miscellaneous licensing options are enabled.
Major revision of software that the resource block was created with.
Minor revision of software that the resource block was created with.
Build of software that the resource block was created with.
The string will contains the following fields:
Major rev: 1-3 characters, decimal number 0-255
Minor rev: 1-3 characters, decimal number 0-255
Build rev: 1-5 characters, decimal number 0-255
Time of build: 8 characters, xx:xx:xx, military time
Day of week of build: 3 characters, Sun, Mon, …
Month of build: 3 characters, Jan, Feb.
Day of month of build: 1-2 characters, decimal number 1-31
Year of build: 4 characters, decimal
Builder: 7 characters, login name of builder
Hardware revision of that hardware that has the resource block in it.
Output board serial number.
The same final assembly number placed on the label.
Indicates the state of the transmitter. NOTE: Will be writable when PWA_SIMULATE is On
during simulation mode.
An enumerated value of repair analysis.
Date associated with the MESSAGE_TEXT parameter
Used to indicate changes made by the user to the device’s installation, configuration, or
calibration.
Used to self test the device. Tests are device specific.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-2. Resource Block Parameters
Number
Parameter
60
DEFINE_WRITE_LOCK
61
62
SAVE_CONFIG_NOW
SAVE_CONFIG_BLOCKS
63
START_WITH_DEFAULTS
64
65
66
SIMULATE_IO
SECURITY_IO
SIMULATE_STATE
67
DOWNLOAD_MODE
68
69
70
RECOMMENDED_ACTION
FAILED_PRI
FAILED_ENABLE
71
FAILED_MASK
72
73
74
75
FAILED_ACTIVE
FAILED_ALM
MAINT_PRI
MAINT_ENABLE
76
MAINT_MASK
77
78
MAINT_ACTIVE
MAINT_ALM
79
80
ADVISE_PRI
ADVISE_ENABLE
81
ADVISE_MASK
82
ADVISE_ACTIVE
Description
Allows the operator to select how WRITE_LOCK behaves. The initial value is “lock
everything”. If the value is set to “lock only physical device” then the resource and transducer
blocks of the device will be locked but changes to function blocks will be allowed.
Allows the user to optionally save all non-volatile information immediately.
Number of EEPROM blocks that have been modified since last burn. This value will count
down to zero when the configuration is saved.
0 = Uninitialized
1 = do not power-up with NV defaults
2 = power-up with default node address
3 = power-up with default pd_tag and node address
4 = power-up with default data for the entire communications stack (no application data)
Status of Simulate jumper/switch
Status of Security jumper/switch
The state of the simulate jumper
0 = Uninitialized
1 = Jumper/switch off, simulation not allowed
2 = Jumper/switch on, simulation not allowed (need to cycle jumper/switch)
3 = Jumper/switch on, simulation allowed
Gives access to the boot block code for over the wire downloads
0 = Uninitialized
1 = Run Mode
2 = Download Mode
Enumerated list of recommended actions displayed with a device alert.
Designates the alarming priority of the FAILED_ALM.
Enabled FAILED_ALM alarm conditions. Corresponds bit for bit to the FAILED_ACTIVE. A bit
on means that the corresponding alarm condition is enabled and will be detected. A bit off
means the corresponding alarm condition is disabled and will not be detected.
Mask of FAILED_ALM. Corresponds bit for bit to FAILED_ACTIVE. A bit on means that the
condition is masked out from alarming.
Enumerated list of failure conditions within a device.
Alarm indicating a failure within a device which makes the device non-operational.
Designates the alarming priority of the MAINT_ALM
Enabled MAINT_ALM alarm conditions. Corresponds bit for bit to the MAINT_ACTIVE. A bit
on means that the corresponding alarm condition is enabled and will be detected. A bit off
means the corresponding alarm condition is disabled and will not be detected.
Mask of MAINT_ALM. Corresponds bit for bit to MAINT_ACTIVE. A bit on means that the
condition is masked out from alarming.
Enumerated list of maintenance conditions within a device.
Alarm indicating the device needs maintenance soon. If the condition is ignored, the device
will eventually fail.
Designates the alarming priority of the ADVISE_ALM
Enabled ADVISE_ALM alarm conditions. Corresponds bit for bit to the ADVISE_ACTIVE. A
bit on means that the corresponding alarm condition is enabled and will be detected. A bit off
means the corresponding alarm condition is disabled and will not be detected.
Mask of ADVISE_ALM. Corresponds bit for bit to ADVISE_ACTIVE. A bit on means that the
condition is masked out from alarming.
Enumerated list of advisory conditions within a device.
3-9
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-2. Resource Block Parameters
Number
Parameter
83
ADVISE_ALM
84
HEALTH_INDEX
85
PWA_SIMULATE
Description
Alarm indicating advisory alarms. These conditions do not have a direct impact on the
process or device integrity.
Parameter representing the overall health of the device, 100 being perfect and 1 being
non-functioning. The value will be set based on the active PWA alarms in accordance with the
requirements stated in “Device Alerts and Health Index PlantWeb Implementation Rules”.
Each device may implement its own unique mapping between the PWA parameters and
HEALTH_INDEX although a default mapping will be available based on the following rules.
HEALTH_INDEX will be set based on the highest priority PWA *_ACTIVE bit as follows:
FAILED_ACTIVE: 0 to 31 - HEALTH_INDEX = 10
MAINT_ACTIVE: 29 to 31 - HEALTH_INDEX = 20
MAINT_ACTIVE: 26 to 28 - HEALTH_INDEX = 30
MAINT_ACTIVE: 19 to 25 - HEALTH_INDEX = 40
MAINT_ACTIVE: 10 to 16 - HEALTH_INDEX = 50
MAINT_ACTIVE: 5 to 9 - HEALTH_INDEX = 60
MAINT_ACTIVE: 0 to 4 - HEALTH_INDEX = 70
ADVISE_ACTIVE: 16 to 31 - HEALTH_INDEX = 80
ADVISE_ACTIVE: 0 to 15 - HEALTH_INDEX = 90
NONE - HEALTH_INDEX = 100
Allows direct writes to the PlantWeb Alert "ACTIVE" parameters and
RB.DETAILED_STATUS. The simulate jumper must be "ON' and the SIMULATE_STATE
must be "Jumper on, simulation allowed" before PWA_SIMULATE can be active.
Block Errors
Table 3-3 lists conditions reported in the BLOCK_ERR parameter.
Table 3-3. BLOCK_ERR
Conditions
.
Number
0
1
Name and Description
Other
Block Configuration Error: A feature in CYCLE_SEL is set that is not supported by
CYCLE_TYPE.
Simulate Active: This indicates that the simulation jumper is in place. This is not an
indication that the I/O blocks are using simulated data.
Input failure/process variable has bad status
Memory Failure: A memory failure has occurred in FLASH, RAM, or EEPROM
memory.
Lost Static Data: Static data that is stored in non-volatile memory
has been lost.
Lost NV Data: Non-volatile data that is stored in non-volatile memory
has been lost.
Device Needs Maintenance Now
Power Up: The device was just powered-up.
OOS: The actual mode is out of service.
3
7
9
10
11
13
14
15
Modes
The resource block supports two modes of operation as defined by the
MODE_BLK parameter:
Automatic (Auto)
The block is processing its normal background memory checks.
3-10
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Out of Service (OOS)
The block is not processing its tasks. When the resource block is in OOS,
all blocks within the resource (device) are forced into OOS. The
BLOCK_ERR parameter shows Out of Service. In this mode, changes can
be made to all configurable parameters. The target mode of a block may
be restricted to one or more of the supported modes.
Alarm Detection
A block alarm will be generated whenever the BLOCK_ERR has an error bit
set. The types of block error for the resource block are defined above. A write
alarm is generated whenever the WRITE_LOCK parameter is cleared. The
priority of the write alarm is set in the following parameter:
•
WRITE_PRI
Table 3-4. Alarm Priority Levels
Number
0
1
2
3-7
8-15
Description
The priority of an alarm condition changes to 0 after the condition that caused the
alarm is corrected.
An alarm condition with a priority of 1 is recognized by the system, but is not
reported to the operator.
An alarm condition with a priority of 2 is reported to the operator, but does not
require operator attention (such as diagnostics and system alerts).
Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.
Status Handling
There are no status parameters associated with the resource block.
PlantWeb™ Alerts
The alerts and recommended actions should be used in conjunction with
“Operation and Maintenance” on page 4-1.
The Resource Block will act as a coordinator for PlantWeb alerts. There will
be three alarm parameters (FAILED_ALARM, MAINT_ALARM, and
ADVISE_ALARM) which will contain information regarding some of the device
errors which are detected by the transmitter software. There will be a
RECOMMENDED_ACTION parameter which will be used to display the
recommended action text for the highest priority alarm and a HEALTH_INDEX
parameters (0 - 100) indicating the overall health of the transmitter.
FAILED_ALARM will have the highest priority followed by MAINT_ALARM
and ADVISE_ALARM will be the lowest priority.
FAILED_ALARMS
A failure alarm indicates a failure within a device that will make the device or
some part of the device non-operational. This implies that the device is in
need of repair and must be fixed immediately. There are five parameters
associated with FAILED_ALARMS specifically, they are described below.
FAILED_ENABLED
This parameter contains a list of failures in the device which makes the
device non-operational that will cause an alert to be sent. Below is a list of
the failures with the highest priority first.
3-11
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-5. Failure Alarms
Alarm
Priority
Electronics Failure
1
Memory Failure
2
Hardware/Software Incompatible
3
Body Temperature Failure
4
Sensor 8 Failure
5
Sensor 7 Failure
6
Sensor 6 Failure
7
Sensor 5 Failure
7
Sensor 4 Failure
9
Sensor 3 Failure
10
Sensor 2 Failure
11
Sensor 1 Failure
12
FAILED_MASK
This parameter will mask any of the failed conditions listed in
FAILED_ENABLED. A bit on means that the condition is masked out from
alarming and will not be reported.
FAILED_PRI
Designates the alerting priority of the FAILED_ALM, see Table 3-4 on
page 3-11. The default is 0 and the recommended value are between 8
and 15.
FAILED_ACTIVE
This parameter displays which of the alarms is active. Only the alarm with
the highest priority will be displayed. This priority is not the same as the
FAILED_PRI parameter described above. This priority is hard coded within
the device and is not user configurable.
FAILED_ALM
Alarm indicating a failure within a device which makes the device
non-operational.
MAINT_ALARMS
A maintenance alarm indicates the device or some part of the device needs
maintenance soon. If the condition is ignored, the device will eventually fail.
There are five parameters associated with MAINT_ALARMS, they are
described below.
MAINT_ENABLED
The MAINT_ENABLED parameter contains a list of conditions indicating
the device or some part of the device needs maintenance soon.
3-12
Reference Manual
00809-0100-4697, Rev EA
October 2011
Table 3-6. Maintenance
Alarms/Priority Alarm
Rosemount 848T
Alarm
Priority
Sensor 8 Degraded
1
Sensor 7 Degraded
2
Sensor 6 Degraded
3
Sensor 5 Degraded
4
Sensor 4 Degraded
5
Sensor 3 Degraded
6
Sensor 2 Degraded
7
Sensor 1 Degraded
8
Body Temperature Out of Range
9
CJC Degraded
10
MAINT_MASK
The MAINT_MASK parameter will mask any of the failed conditions listed
in MAINT_ENABLED. A bit on means that the condition is masked out
from alarming and will not be reported.
MAINT_PRI
MAINT_PRI designates the alarming priority of the MAINT_ALM, Table 3-4
on page 3-11. The default is 0 and the recommended values is 3 to 7.
MAINT_ACTIVE
The MAINT_ACTIVE parameter displays which of the alarms is active.
Only the condition with the highest priority will be displayed. This priority is
not the same as the MAINT_PRI parameter described above. This priority
is hard coded within the device and is not user configurable.
MAINT_ALM
An alarm indicating the device needs maintenance soon. If the condition is
ignored, the device will eventually fail.
Advisory Alarms
An advisory alarm indicates informative conditions that do not have a direct
impact on the device's primary functions. There are five parameters
associated with ADVISE_ALARMS, they are described below.
ADVISE_ENABLED
The ADVISE_ENABLED parameter contains a list of informative
conditions that do not have a direct impact on the device's primary
functions. Below is a list of the advisories with the highest priority first.
Alarm
PWA Simulate Active
Excessive Deviation
Excessive Rate of Change
Priority
1
2
3
NOTE
Alarms are only prioritized if Multi-Bit Alerts are disabled. If MBA is enabled,
all alerts are visible.
3-13
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
ADVISE_MASK
The ADVISE_MASK parameter will mask any of the failed conditions listed
in ADVISE_ENABLED. A bit on means the condition is masked out from
alarming and will not be reported.
ADVISE_PRI
ADVISE_PRI designates the alarming priority of the ADVISE_ALM, see
Table 3-4 on page 3-11. The default is 0 and the recommended values are
1 or 2.
ADVISE_ACTIVE
The ADVISE_ACTIVE parameter displays which of the advisories is
active. Only the advisory with the highest priority will be displayed. This
priority is not the same as the ADVISE_PRI parameter described above.
This priority is hard coded within the device and is not user configurable.
ADVISE_ALM
ADVISE_ALM is an alarm indicating advisory alarms. These conditions do
not have a direct impact on the process or device integrity.
Recommended Actions
for PlantWeb Alerts
Table 3-7.
RB.RECOMMENDED_ACTION
RECOMMENDED_ACTION
The RECOMMENDED_ACTION parameter displays a text string that will give
a recommended course of action to take based on which type and which
specific event of the PlantWeb alerts are active.
Alarm Type
None
Advisory
None
PWA Simulate Active
Advisory
Advisory
Excessive Deviation
Excessive Rate of
Change
CJC Degraded
Maintenance
Maintenance
3-14
Active Event
Maintenance
Body Temperature Out
of Range
Sensor 1 Degraded
Maintenance
Sensor 2 Degraded
Maintenance
Sensor 3 Degraded
Maintenance
Sensor 4 Degraded
Maintenance
Sensor 5 Degraded
Maintenance
Sensor 6 Degraded
Maintenance
Sensor 7 Degraded
Recommended Action
No action is required.
Disable simulation to return to process
monitoring.
If T/C sensors are being used, restart the
device. If condition persists, replace the
device.
Verify the ambient temperature is within
operating limits.
Confirm the operating range of Sensor 1
and/or verify the sensor connection and
device environment.
Confirm the operating range of Sensor 2
and/or verify the sensor connection and
device environment.
Confirm the operating range of Sensor 3
and/or verify the sensor connection and
device environment.
Confirm the operating range of Sensor 4
and/or verify the sensor connection and
device environment.
Confirm the operating range of Sensor 5
and/or verify the sensor connection and
device environment.
Confirm the operating range of Sensor 6
and/or verify the sensor connection and
device environment.
Conform the operating range of Sensor 7
and/or verify the sensor connection and
device environment.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Alarm Type
Active Event
Maintenance
Sensor 8 Degraded
Failed
Sensor 1 Failure
Failed
Sensor 2 Failure
Failed
Sensor 3 Failure
Failed
Sensor 4 Failure
Failed
Sensor 5 Failure
Failed
Sensor 6 Failure
Failed
Sensor 7 Failure
Failed
Sensor 8 Failure
Failed
Body Temperature
Failure
Hardware/Software
Incompatible
Failed
Failed
Memory Error
Failed
Electronics Failure
Recommended Action
Confirm the operating range of Sensor 8
and/or verify the sensor connection and
device environment.
Verify the Sensor 1 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 2 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 3 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 4 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 5 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 6 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 7 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify the Sensor 8 Instrument process is
within the Sensor range and/or confirm
sensor configuration and wiring.
Verify that the body temperature is within
the operating limits of this device.
Contact Service Center to verify the
Device Information
(RESOURCE.HARDWARE_REV, AND
RESOURCE.RB_SFTWR_REV_ALL).
Restart the device. If the problem persists,
replace the device.
Restart the device. If the problem persists,
replace the device.
NOTE
If status is set up to flag failure/warning you will see associated sensor
degraded or failure alert.
Transducer Blocks
The transducer block allows the user to view and manage the channel
information. There is one Transducer Block for the eight sensors that contains
specific temperature measurement data, including:
•
Sensor Type
•
Engineering Units
•
Damping
•
Temperature Compensation
•
Diagnostics
3-15
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Transducer Block Channel Definitions
The 848T supports multiple sensor inputs. Each input has a channel assigned
to it allowing an AI or MAI Function Blocks to be linked to that input. The
channels for the 848T are as follows:
Table 3-8. Channel Definitions
for the 848T
Channel
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Description
Channel
Sensor One
Sensor Two
Sensor Three
Sensor Four
Sensor Five
Sensor Six
Sensor Seven
Sensor Eight
Differential Sensor 1
Differential Sensor 2
Differential Sensor 3
Differential Sensor 4
Body Temperature
Sensor 1 Deviation
Sensor 2 Deviation
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Description
Sensor 3 Deviation
Sensor 4 Deviation
Sensor 5 Deviation
Sensor 6 Deviation
Sensor 7 Deviation
Sensor 8 Deviation
Sensor 1 Rate Change
Sensor 2 Rate Change
Sensor 3 Rate Change
Sensor 4 Rate Change
Sensor 5 Rate Change
Sensor 6 Rate Change
Sensor 7 Rate Change
Sensor 8 Rate Change
Channel
1
Units/Ranging
Temperature
Compensation
A/D
Signal
Conversion
Linearization
Figure 3-1. Transducer Block
Data Flow
Diagnostics
Measurement
Validation
Damping
CJC
Channel
2
Channel
3
Channel
4
Channel
5
Channel
6
Channel
7
Channel
8
Channel
9
Channel
10
Channel
11
Channel
12
Channel
13
S1
S2
S3
S4
S5
S6
S7
S8
DS1
DS2
DS3
DS4
BT
Transducer Block Errors
The following conditions are reported in the BLOCK_ERR and XD_ERROR
parameters.
3-16
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
BLOCK_ERR
Table 3-9. Block/Transducer
Error
Condition Number, Name, and Description
0
7
15
Other(1)
Input failure/process variable has bad status
Out of service: The actual mode is out of service
(1) If BLOCK_ERR is “other,” then see XD_ERROR.
Transducer Block Modes
The transducer block supports two modes of operation as defined by the
MODE_BLK parameter:
Automatic (Auto)
The block outputs reflect the analog input measurement.
Out of Service (OOS)
The block is not processed. Channel outputs are not updated and the
status is set to Bad: Out of Service for each channel. The BLOCK_ERR
parameter shows Out of Service. In this mode, changes can be made to all
configurable parameters. The target mode of a block may be restricted to
one or more of the supported modes.
Transducer Block Alarm Detection
Alarms are not generated by the transducer block. By correctly handling the
status of the channel values, the down stream block (AI or MAI) will generate
the necessary alarms for the measurement. The error that generated this
alarm can be determined by looking at BLOCK-ERR and XD_ERROR.
Transducer Block Status Handling
Normally, the status of the output channels reflect the status of the
measurement value, the operating condition of the measurement electronics
card, and any active alarm conditions. In a transducer, PV reflects the value
and status quality of the output channels.
Table 3-10. Transducer Block Parameters
Number Parameter
Description
0
1
2
3
4
5
6
BLOCK
ST_REV
TAG_DESC
STRATEGY
ALERT_KEY
MODE_BLK
BLOCK_ERR
7
8
UPDATE_EVENT
BLOCK_ALM
9
TRANSDUCER_DIRECTORY
10
11
TRANSDUCER_TYPE
XD_ERROR
The revision level of the static data associated with the function block.
The user description of the intended application of the block.
The strategy field can be used to identify grouping of blocks.
The identification number of the plant unit.
The actual, target, permitted, and normal modes of the block.
This parameter reflects the error status associated with the hardware or software
components associated with a block. Multiple errors may be shown. For a list of
enumeration values, see FF-890, Block_Err formal model.
This alert is generated by any change to the static data.
The BLOCK-ALM is used for all configuration, hardware, connection failure or system
problems in the block. The cause of the alert is entered in the subcode field. The first alert
to become active will set the Active status in the Status attribute. As soon as the
Unreported status is cleared by the alert reporting task, another block alert may be
reported without clearing the Active status, if the subcode has changed.
A directory that specified the number and stating indices of the transducers in the
transducer block.
Identifies the transducer that follows 101 – Standard Temperature with Calibration.
Provides additional error codes related to transducer blocks. For a list of enumeration
values, see FF-902. Please see tables below for a list of sub-parameters that pertain to
XD_ERROR messages.
3-17
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-10. Transducer Block Parameters
Number Parameter
Description
12
COLLECTION_DIRECTORY
13
SENSOR_1_CONFIG
14
15
PRIMARY_VALUE_1
SENSOR_2_CONFIG
16
17
PRIMARY_VALUE_2
SENSOR_3_CONFIG
18
19
PRIMARY_VALUE_3
SENSOR_4_CONFIG
20
21
PRIMARY_VALUE_4
SENSOR_5_CONFIG
22
23
PRIMARY_VALUE_5
SENSOR_6_CONFIG
24
25
PRIMARY_VALUE_6
SENSOR_7_CONFIG
26
27
PRIMARY_VALUE_7
SENSOR_8_CONFIG
28
29
PRIMARY_VALUE_8
SENSOR_STATUS
30
SENSOR_CAL
31
CAL_STATUS
32
33
34
35
ASIC_REJECTION
BODY_TEMP
BODY_TEMP_RANGE
TB_SUMMARY_STATUS
36
DUAL_SENSOR_1_CONFIG
37
38
DUAL_SENSOR_VALUE_1
DUAL_SENSOR_2_CONFIG
39
40
DUAL_SENSOR_VALUE_2
DUAL_SENSOR_3_CONFIG
41
42
DUAL_SENSOR_VALUE_3
DUAL_SENSOR_4_CONFIG
43
44
DUAL_SENSOR_VALUE_4
DUAL_SENSOR_STATUS
45
VALIDATION_SNSR1_CONFIG
46
VALIDATION_SNSR1_VALUES
47
VALIDATION_SNSR2_CONFIG
3-18
A directory that specifies the number, starting indices, and DD Item ID’s of the data
collections in each transducer block.
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block.
Sensor Configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block.
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block.
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block.
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block.
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block.
Sensor Configuration Parameters. Please see tables below for a list of sub-parameters
that pertain to Sensor Configuration functions.
The measured value and status available to the function block
Status of each individual sensor. Please see tables below for a list of possible status
messages.
Parameter structure to allow for calibration of each sensor. Please see tables below for a
list of sub-parameters that pertain to Sensor Calibration functions.
Status of the calibration that was previously performed. Please see tables below for a list
of possible Calibration Statuses.
A configurable power line noise rejection setting.
Body Temperature of the device.
The range of the body temperature including the units index.
Overall summary status of the sensor transducer. Please see tables below for a list of
possible transducer statuses.
Parameter structure to allow for calibration of each differential measurement. Please see
tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions.
The measured value and status available to the function block.
Parameter structure to allow for calibration of each differential measurement. Please see
tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions.
The measured value and status available to the function block.
Parameter structure to allow for calibration of each differential measurement. Please see
tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions.
The measured value and status available to the function block.
Parameter structure to allow for calibration of each differential measurement. Please see
tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions.
The measured value and status available to the function block.
Status of each individual differential measurement. Please see tables below for a list of
possible Dual Sensor statuses.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-10. Transducer Block Parameters
Number Parameter
Description
48
VALIDATION_SNSR2_VALUES
49
VALIDATION_SNSR3_CONFIG
50
VALIDATION_SNSR3_VALUES
51
VALIDATION_SNSR4_CONFIG
52
VALIDATION_SNSR4_VALUES
53
VALIDATION_SNSR5_CONFIG
54
VALIDATION_SNSR5_VALUES
55
VALIDATION_SNSR6_CONFIG
56
VALIDATION_SNSR6_VALUES
57
VALIDATION_SNSR7_CONFIG
58
VALIDATION_SNSR7_VALUES
59
VALIDATION_SNSR8_CONFIG
60
VALIDATION_SNSR8_VALUES
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Validation configuration parameters. Please see tables below for a list of sub-parameters
that pertain to Validation Configuration functions.
Validation value parameters. Please see tables below for a list of sub-parameters that
pertain to Validation values.
Changing the Sensor Configuration in the Transducer Block
If the FOUNDATION fieldbus configuration tool or host system does not support
the use of DD methods for device configuration, the following steps illustrate
how to change the sensor configuration in the transducer block:
1.
Set the MODE_BLK.TARGET to OOS, or set the SENSOR_MODE to
configuration.
2.
Set SENSOR_n_CONFIG.SENSOR to the appropriate sensor type,
and then set SENSOR_n_CONFIG.CONNECTION to the appropriate
type and connection.
3.
In the Transducer Block, set MODE_BLK.TARGET to AUTO, or set
the SENSOR_MODE to operation.
3-19
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Transducer Block
Sub-Parameter Tables
Table 3-11. XD_ERROR
Sub-Parameter Structure
XD ERROR
0
20
Electronics Failure
An error has occurred that could not be classified as
one of the errors listed below.
An error occurred during calibration of the device or a
calibration error has been detected during operation of
the device.
An error occurred during configuration of the device or
a configuration error has been detected during
operation of the device.
An electronic component has failed.
22
I/O Failure
An I/O failure has occurred.
Data Integrity Error
Indicates that data stored within the system may no
longer be valid due to non-volatile memory checksum
failure, data verify after write failure, etc.
The software has detected an error. This could be
caused by an improper interrupt service routine, an
arithmetic overflow, a watchdog timer, etc.
The algorithm used in the transducer block produced
an error. This could be due to an overflow, data
reasonableness.
17
General Error
Calibration Error
18
Configuration Error
19
23
Software Error
24
Algorithm Error
25
Table 3-12. SENSOR_CONFIG
Sub-Parameter Structure
SENSOR CONFIG
STRUCTURE
Parameter
SENSOR_MODE
SENSOR_TAG
SERIAL_NUMBER
SENSOR
DAMPING
INPUT_TRANSIENT_FILTER
RTD_2_WIRE_OFFSET
ENG_UNITS
UPPER_RANGE
LOWER_RANGE
3-20
Description
No Error
Description
Disables or enables a sensor for configuration.
Sensor description.
Serial number for the attached sensor.
Sensor Type and Connection. MSB is the sensor type and
LSB is the connection.
Sampling Interval used to smooth output using a first order
linear filter. A value entered between 0 and the Update_Rate,
will result in a damping value equal to the Update_Rate.
Enables or Disables the option for reporting fast changing
sensor inputs without temporary holdoff. 0 = Disable, 1 =
Enabled.
User entered value for constant lead-wire resistance
correction in a 2-wire RTD and Ohm sensor types.
The engineering units used for reporting measured sensor
values.
The upper sensor limit for the selected sensor is displayed
using Units_Index sub parameter.
The lower sensor limit for the selected sensor is displayed
using Units_Index sub parameter.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Table 3-13. SENSOR_STATUS
Sub-Parameter Structure
Table 3-14. SENSOR_CAL
Sub-Parameter Structure
Rosemount 848T
Sensor Status Table
0x00
Active
0x01
Out of Service
0x02
Inactive
0x04
Open
0x08
Short
0x10
Out of Range
0x20
Beyond Limits
0x40
Excess EMF Detected
0x80
Other
SENSOR CALIBRATION
STRUCTURE
Parameter
Description
SENSOR_NUMBER
The sensor number to calibrate
CALIB_POINT_HI
The High calibration point for the selected sensor
CALIB_POINT_LO
The Low calibration point for the selected sensor
CALIB_UNIT
CALIB_METHOD
The engineering units used for calibrating the sensor
The method of the last calibration for sensor
103 - factory trim standard calibration
104 - user trim standard calibration
CALIB_INFO
Information regarding the calibration
CALIB_DATE
Date that the calibration was completed
CALIB_MIN_SPAN
The minimum calibration span value allowed. This minimum span
information is necessary to ensure that when calibration is done,
the two calibrated points are not too close together
CALIB_PT_HI_LIMIT
The High calibration unit
CALIB_PT_LO_LIMIT
The Low calibration unit
Table 3-15. CAL_STATUS
Structure
Cal Status
0
No Command Active
1
Command Executing
2
Command Done
3
Command Done: Errors
Table 3-16. Transducer Status
Sub-Parameter Structure
Transducer Status Table
0x01
A/D Failure
0x02
Sensor Failure
0x04
Dual Sensor Failure
0x08
CJC Degraded
0x10
CJC Failure
0x20
Body Temp Failure
0x40
Sensor Degraded
0x80
Body Temperature Degraded
3-21
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 3-17. DUAL_SENSOR
CONFIG Sub-Parameter
Structure
DUAL SENSOR CONFIG
STRUCTURE
Parameter
Description
DUAL_SENSOR_MODE
DUAL_SENSOR_TAG
Sensor to be used in DUAL_SENSOR_CALC
INPUT_B
Sensor to be used in DUAL_SENSOR_CALC
ENG_UNITS
Table 3-19. Validation Value
Sub-Parameter Structure
Equation used for the dual sensor measurement including:
Not Used, Difference (Input A - Input B), and Absolute
Difference (Input A - Input B)
Units used to display sensor parameter
UPPER_RANGE
Upper Differential Limit (Input A High - Input B Low)
LOWER_RANGE
Lower Differential Limit (Input A Low - Input B High)
Dual Sensor Status Table
0x00
Active
0x01
Out of Service
0x02
Inactive
0x04
Component Sensor Open
0x08
Component Sensor Short
0x10
Component Sensor Out of Range or Degraded
0x20
Component Sensor Out of Limits
0x40
Component Sensor Inactive
0x80
Configuration Error
Validation Value Sub-Parameter
Structure
Parameter
VALIDATION_STATUS
DEVIATION_VALUE
Description
State of the channel specific measurement validation
measurement
Deviation output value
DEVIATION_STATUS
Status of the deviation output
RATE_OF_CHANGE_VALUE
Rate of change value output
RATE_OF_CHANGE_STATUS
3-22
Differential description
INPUT_A
DUAL_SENSOR_CALC
Table 3-18. DUAL_SENSOR_
STATUS Sub-Parameter
Structure
Disables or enables a sensor for configuration
Status of Rate of change output
Reference Manual
00809-0100-4697, Rev EA
October 2011
Table 3-20. Validation Config
Sub-Parameter Structure
Rosemount 848T
Validation Value Sub-Parameter
Structure
Parameter
VALIDATION_MODE
Description
Activates the measurement validation data gathering
process
0 = Disable
1 = Enable
SAMPLE_RATE
Number of seconds per sample used for measurement
validation data collection. This shouldn't exceed 10 seconds
per sample, but currently there are no upper limits.
DEVIATION_LIMIT
Sets the limit for the deviation diagnostic. DD limits the upper
range to 10.
DEVIATION_ENG_UNITS
Units tied to the deviation output value
Advisory, Maintenance, Failure
0 = Disabled = Does not use the limits, but provides an
output
1 = Advisory = No effect on sensor status, sets advisory
PWA
DEVIATION_ALERT_SEVERITY
2 = Maint = Sets sensor status to uncertain, sets
advisory PWA
3 = Failure = Sets sensor status to Bad, sets advisory
PWA
DEVIATION_PCNT_LIM_HYST
Deviation Hysteresis Limit = (1 DEVIATION_PCNT_LIM_HYST/100) * DEVIATION_LIMIT
RATE_INCREASING_LIMIT
Increasing Rate of Change limit set point
RATE_DECREASING_LIMIT
Decreasing Rate of Change limit set point
RATE_ENG_UNITS
Units tied to the rate of change output value
RATE_ALERT_SEVERITY
Advisory, Maintenance, Failure
0 = Disabled = Does not use the limits, but provides an
output
1 = Advisory = No effect on sensor status, sets advisory
PWA
2 = Maint = Sets sensor status to uncertain, sets
advisory PWA
3 = Failure = Sets sensor status to Bad, sets advisory
PWA
RATE_PCNT_LIM_HYST
Rate of Change Increasing Hysteresis Limit = (1 RATE_PCNT_LIM_HYST/100) *
RATE_INCREASING_LIMIT
Sensor Calibration in the Sensor Transducer Block
If the FOUNDATION fieldbus configuration tool or host system does not support
the use of DD methods for device configuration, the following steps illustrate
how to calibrate the sensor from the sensor transducer block:
NOTE:
Active calibrators should not be used in conduction with RTDs on any multiple
input temperature transmitter such as the 848T.
3-23
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
3-24
1.
Under SENSOR_CALIB, the SENSOR_NUMBER to the number of
the sensor to calibrate.
2.
Set CALIB_UNIT to calibration unit.
3.
Set CALIB_METHOD to User Trim (seeTable 3-8 on page 3-16 for
valid values).
4.
Set the input value of the sensor simulator to be within the range
defined by CALIB_LO_LIMIT and CALIB_HI_LIMIT.
5.
Set CALIB_POINT_LO (CALIB_POINT_HI) to the value set at the
sensor simulator.
6.
Read CALIB_STATUS and wait until it reads “Command Done”
7.
Repeat steps 3 to 5 if performing a two-point trim. Note that the
difference in values between CALIB_POINT_LO and
CALIB_POINT_HI must be greater than CALIB_MIN_SPAN.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Section 4
Rosemount 848T
Operation and Maintenance
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-1
Foundation fieldbus Information . . . . . . . . . . . . . . . . . . . . page 4-1
Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-4
SAFETY MESSAGES
Instructions and procedures in this section may require special precautions to
ensure the safety of the personnel performing the operations. Information that
potentially raises safety issues is indicated by a warning symbol ( ). Please
refer to the following safety messages before performing an operation
preceded by this symbol.
Warnings
Failure to follow these installation guidelines could result in death or
serious injury.
•
Make sure only qualified personnel perform the installation.
Process leaks could result in death or serious injury.
•
Do not remove the thermowell while in operation. Removing while in operation may
cause process fluid leaks.
•
Install and tighten thermowells and sensors before applying pressure, or process
leakage may result.
Electrical shock could cause death or serious injury.
FOUNDATION FIELDBUS
INFORMATION
www.rosemount.com
•
If the senor is installed in a high voltage environment and a fault condition or
installation error occurs, high voltage may be present on transmitter leads and
terminals.
•
Use extreme caution when making contact with the leads and terminals.
FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop
communication protocol that interconnects devices such as transmitters and
valve controllers. It is a local area network (LAN) for instruments that enable
basic control and I/O to be moved to the field devices. The Model 848T uses
FOUNDATION fieldbus technology developed and supported by Emerson
Process Management and the other members of the independent Fieldbus
FOUNDATION.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table 4-1. Block Diagram for the
Rosemount 848T
Function Blocks
• AI, MAI, and ISEL
FOUNDATION
Fieldbus
Communications
Stack
Analog-to-Digital
Signal
Conversion
(8 sensors)
Resource
Block
• physical
device
information
Transducer Block
Measurement Sensor
• sensor and differential
temp
• terminal temp.
• sensor configuration
• calibration
• diagnostics
Cold Junction
Input-to-Output
Isolation
Commissioning
(Addressing)
To be able to setup, configure, and have it communicate with other devices on
a segment, a device must be assigned a permanent address. Unless
requested otherwise, it is assigned a temporary address when shipped from
the factory.
If there are two or more devices on a segment with the same address, the first
device to start up will use the assigned address (ex. Address 20). Each of the
other devices will be given one of the four available temporary addresses. If a
temporary address is not available, the device will be unavailable until a
temporary address becomes available.
Use the host system documentation to commission a device and assign a
permanent address.
4-2
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
HARDWARE
MAINTENANCE
The 848T has no moving parts and requires a minimal amount of scheduled
maintenance. If a malfunction is suspected, check for an external cause
before performing the diagnostics presented below.
Sensor Check
To determine whether the sensor is causing the malfunction, connect a sensor
calibrator or simulator locally at the transmitter. Consult an Emerson Process
Management representative for additional temperature sensor and accessory
assistance.
Communication/Power
Check
If the transmitter does not communicate or provides an erratic output, check
for adequate voltage to the transmitter. The transmitter requires between 9.0
and 32.0 VDC at the terminals to operate with complete functionality. Check
for wire shorts, open circuits, and multiple grounds.
Resetting the
Configuration
(RESTART)
There are two types of restarts available in the Resource Block. The following
section outlines the usage for each of these. For further information, see
RESTART in Table 3-2 on page 3-6.
Restart Processor (cycling)
Performing a Restart Processor has the same effect as removing power from
the device and reapplying power.
Restart with Defaults
Performing a Restart with Defaults resets the static parameters for all of the
blocks to their initial state. This is commonly used to change the configuration
and/or control strategy of the device, including any custom configurations
done at the Rosemount factory.
4-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
TROUBLESHOOTING
FOUNDATION fieldbus
Symptom
Possible Cause
Corrective Action
Device does not show
up in the live list
Network configuration parameters
are incorrect
Set the network parameters of the LAS (host system) according to the FF
Communications Profile
ST: 8
MRD: 4
DLPDU PhLO: 4
MID: 7
TSC: 4 (1 ms)
T1: 96000 (3 seconds)
T2: 9600000 (300 seconds)
T3: 480000 (15 seconds)
Set first Unpolled Node and Number of UnPolled Nodes so that the device
address is within range
Increase the power to at least 9V
Network address is not in polled
range
Power to the device is below the
9 VDC minimum
Noise on the power /
communication is too high
Device that is acting as
a LAS does not send
out CD
All devices go off live
list and then return
LAS Scheduler was not
downloaded to the Backup LAS
device
Live list must be reconstructed by
Backup LAS device
Verify terminators and power conditioners are within specification
Verify that the shield is properly terminated and not grounded at both ends. It is
best to ground the shield at the power conditioner
Ensure that all of the devices that are intended to be a Backup LAS are
marked to receive the LAS schedule
Current link setting and configured links settings are different. Set the current
link setting equal to the configured settings.
Resource Block
Symptom
Possible Causes
Corrective Action
Mode will not leave
OOS
Target mode not set
Set target mode to something other than OOS.
Memory Failure
Features
BLOCK_ERR will show the lost NV Data or Lost Static Data bit set. Restart the
device by setting RESTART to Processor. If the block error does not clear, call
the factory.
FEATURES_SEL does not have Alerts enabled. Enable the report bit.
Notification
LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY.
Block Alarms Will not
work
Transducer Block Troubleshooting
Symptom
Possible Causes
Corrective Action
Mode will not leave
OOS
Target mode not set
A/D board check sum error
Resource block
Set target mode to something other than OOS.
The A/D board has a checksum error.
The actual mode of the Resource block is in OOS. See Resource Block
Diagnostics for corrective action.
The actual mode of the Transducer Block is OOS.
Look at the SENSOR_STATUS parameter (See Table 3-16 on page 3-21)
The primary value is
BAD
4-4
Transducer Block
Measurement
Reference Manual
00809-0100-4697, Rev EA
October 2011
Appendix A
Rosemount 848T
Reference Data
Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . page A-1
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-3
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . page A-4
Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-4
Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-8
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-12
FUNCTIONAL
SPECIFICATIONS
Inputs
Eight independently configurable channels including combinations of 2- and
3-wire RTDs, thermocouples, mV, 2- and 3-wire and ohm inputs.
4–20 mA inputs using optional connector(s).
Outputs
Manchester-encoded digital signal that conforms to IEC 61158 and ISA 50.02.
Status
• 600 Vdc channel to channel isolation(1)
• 10 Vdc channel to channel isolation for all operating conditions with
maximum 150 m. (500 ft) of sensor lead length 18 AWG.
Ambient Temperature Limits
–40 to 185 °F (–40 to 85 °C)
Isolation
Isolation between all sensor channels is rated to 10Vdc over all operating
conditions. No damage will occur to the device with up to 600 Vdc between
any sensor channel.
Power Supply
Powered over FOUNDATION fieldbus with standard fieldbus power supplies.
The transmitter operates between 9.0 and 32.0 V dc, 22 mA maximum.
(Transmitter power terminals are rated to 42.4 V dc.)
(1)
www.rosemount.com
Reference conditions are -40 to 60 °C (-40 to 140 °F) with 30 m. (100 ft) of sensor lead
length 18 AWG wire.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Transient Protection
The transient protector (option code T1) helps to prevent damage to the
transmitter from transients induced on the loop wiring by lightning, welding,
heavy electrical equipment, or switch gears. This option is installed at the
factory for the Rosemount 848T and is not intended for field installation.
Update Time
Approximately 1.5 seconds to read all 8 inputs.
Humidity Limits
0–99% non-condensing relative humidity
Turn-on Time
Performance within specifications is achieved in less than 30 seconds after
power is applied to the transmitter.
Alarms
The AI and ISEL function blocks allow the user to configure the alarms to
HI-HI, HI, LO, or LO-LO with a variety of priority levels and hysteresis settings.
Backup Link Active Scheduler (LAS)
The transmitter is classified as a device link master, which means it can
function as a Link Active Scheduler (LAS) if the current link master device fails
or is removed from the segment.
The host or other configuration tool is used to download the schedule for the
application to the link master device. In the absence of a primary link master,
the transmitter will claim the LAS and provide permanent control for the H1
segment.
FOUNDATION fieldbus Parameters
Schedule Entries
Links
Virtual Communications Relationships (VCR)
A-2
20
30
20
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
PHYSICAL SPECIFICATIONS
Mounting
The Rosemount 848T can be mounted directly onto a DIN rail or it can be
ordered with an optional junction box. When using the optional junction box,
the transmitter can be mounted onto a panel or a 2-in. pipe stand (with option
code B6).
Entries for Optional Junction Box
No entry
• Used for custom fittings
Cable Gland
• 9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable
Conduit
• 5 plugged 0.86-in. diameter holes suitable for installing 1/2-in. NPT fittings.
Materials of Construction for Optional Junction Box
Junction Box Type
Aluminum
Plastic
Stainless Steel
Aluminum Explosion-proof
Paint
Epoxy Resin
NA
NA
NA
Weight
Assembly
Rosemount 848T only
Aluminum(1)
Plastic (1)
Stainless Steel (1)
Aluminum Explosion-proof
Weight
oz
lb
7.5
78.2
78.2
77.0
557
.47
4.89
4.89
4.81
34.8
kg
.208
2.22
2.22
2.18
15.5
(1) Add 35.2 oz. (2.2 lb., 0.998 kg) for nickel-plated brass glands
Environmental Ratings
NEMA Type 4X and IP66 with optional junction box. JX3 Explosion-proof
enclosure rated to -4 °F (-20 °C).
A-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
FUNCTION BLOCKS
Analog Input (AI)
• Processes the measurement and makes it available on the
fieldbus segment.
• Allows filtering, alarming, and engineering unit changes.
Input Selector (ISEL)
• Used to select between inputs and generate an output using specific
selection strategies such as minimum, maximum, midpoint, or average
temperature.
• Since the temperature value always contains the measurement status, this
block allows the selection to be restricted to the first “good” measurement.
Multiple Analog Input Block (MAI)
• The MAI block allows the eight AI blocks to be multiplexed together so
they serve as one function block on the H1 segment, resulting in greater
network efficiency.
PERFORMANCE
SPECIFICATIONS
Stability
• ±0.1% of reading or 0.1 °C (0.18 °F), whichever is greater, for 2 years
for RTDs
• ±0.1% of reading or 0.1 °C (0.18 °F), whichever is greater, for 1 year for
thermocouples.
Self Calibration
The transmitter’s analog-to-digital circuitry automatically self-calibrates for
each temperature update by comparing the dynamic measurement to
extremely stable and accurate internal reference elements.
Vibration Effect
Transmitters are tested to high pipeline vibration specification per IEC
60770-1 1999 with no effect on performance.
Electromagnetic Compatibility Compliance Testing
• Meets the criteria under IEC 61326:2006
• Meets the criteria under European Union Directive 2004/108/EC
A-4
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Accuracy
Table 1. Input Options/Accuracy
Input Ranges
Sensor Option
Sensor Reference
2- and 3-Wire RTDs
Pt 50 ( = 0.00391)
GOST 6651-94
Pt 100 ( = 0.00391)
GOST 6651-94
Pt 100 ( = 0.00385)
IEC 751; = 0.00385, 1995
Pt 100 ( = 0.003916)
JIS 1604, 1981
Pt 200 ( = 0.00385)
IEC 751; = 0.00385, 1995
Pt 200 ( = 0.003916)
JIS 1604; = 0.003916, 1981
Pt 500
IEC 751; = 0.00385, 1995
Pt 1000
IEC 751; = 0.00385, 1995
Ni 120
Edison Curve No. 7
Cu 10
Edison Copper Winding No. 15
Cu 100 (a=428)
GOST 6651-94
Cu 50 (a=428)
GOST 6651-94
Cu 100 (a=426)
GOST 6651-94
Cu 50 (a=426)
GOST 6651-94
Thermocouples—Cold Junction Adds + 0.5 °C to Listed Accuracy
NIST Type B (Accuracy varies
NIST Monograph 175
according to input range)
NIST Type E
NIST Monograph 175
NIST Type J
NIST Monograph 175
NIST Type K
NIST Monograph 175
NIST Type N
NIST Monograph 175
NIST Type R
NIST Monograph 175
NIST Type S
NIST Monograph 175
NIST Type T
NIST Monograph 175
DIN L
DIN 43710
DIN U
DIN 43710
w5Re26/W26Re
ASTME 988-96
GOST Type L
GOST R 8.585-2001
Terminal Temperature
Ohm Input
Millivolt Input
1000 mV
4–20 mA (Rosemount)(1)
4–20 mA (NAMUR)(1)
Multipoint Sensors(2)
Accuracy Over Range(s)
°C
°F
°C
°F
–200 to 550
–200 to 550
–200 to 850
–200 to 645
–200 to 850
–200 to 645
–200 to 850
–200 to 300
–70 to 300
–50 to 250
-185 to 200
-185 to 200
-50 to 200
-50 to 200
–328 to 1022
–328 to 1022
–328 to 1562
–328 to 1193
–328 to 1562
–328 to 1193
–328 to 1562
–328 to 572
–94 to 572
–58 to 482
-365 to 392
-365 to 392
-122 to 392
-122 to 392
± 0.57
± 0.28
± 0.30
± 0.30
± 0.54
± 0.54
± 0.38
± 0.40
± 0.30
± 3.20
± 0.48
± 0.96
± 0.48
± 0.96
± 1.03
± 0.50
± 0.54
± 0.54
± 0.98
± 0.98
± 0.68
± 0.72
± 0.54
± 5.76
±0.86
±1.73
±0.86
±1.73
100 to 300
212 to 572
301 to 1820
573 to 3308
–200 to 1000
–328 to 1832
–180 to 760
–292 to 1400
–180 to 1372
–292 to 2501
–200 to 1300
–328 to 2372
0 to 1768
32 to 3214
0 to 1768
32 to 3214
–200 to 400
–328 to 752
–200 to 900
–328 to 1652
–200 to 600
–328 to 1112
0 to 2000
32 to 3632
-200 to 800
-392 to 1472
-50 to 85
-58 to 185
0 to 2000 ohms
-10 to 100 mV
-10 to 1000 mV
4–20 mA
4–20 mA
± 6.00
± 10.80
± 1.54
± 2.78
± 0.40
± 0.72
± 0.70
± 1.26
± 1.00
± 1.80
± 1.00
± 1.80
± 1.50
± 2.70
± 1.40
± 2.52
± 0.70
± 1.26
± 0.70
± 1.26
± 0.70
± 1.26
± 1.60
± 2.88
± 0.71
± 1.28
±3.50
± 6.30
± 0.90 ohms
± 0.05 mV
± 1.0 mA
± 0.01 mA
± 0.01 mA
(1) Requires the S002 option code.
(2) Multipoint (up to 8 points) thermocouples and RTDs are available for purchase with the Rosemount 848T. Input ranges and accuracy for these sensors will
depend on the specific multipoint sensor chosen. For more information, contact your local Emerson representative.
Differential Configuration Notes
Differential capability exists between any two sensor types.
For all differential configurations, the input range is X to Y where X = Sensor A minimum - Sensor B max.
Y = Sensor A maximum - Sensor B min.
Accuracy for Differential Configurations:
If sensor types are similar (for example, both RTDs or both thermocouples), the accuracy = 1.5 times worst case accuracy of either sensor type.
If sensor types are dissimilar (for example, one RTD and one thermocouple), the accuracy = Sensor 1 Accuracy + Sensor 2 Accuracy.
A-5
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Analog Sensors 4–20mA
Two types of 4–20 mA sensors are compatible with the Rosemount 848T. These types must be ordered with the S002 option code complete
with an analog connector kit. The alarm levels, accuracy for each type are listed in Table 2.
Table 2. Analog Sensors
Sensor Option
Alarm Levels
Accuracy
4–20mA (Rosemount
Standard)
4–20mA (NAMUR)
3.9 to 20.8 mA
± 0.01mA
3.8 to 20.5 mA
± 0.01mA
A-6
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Ambient Temperature Effect
Transmitter may be installed in locations where the ambient temperature is between -40 and 85 °C (-40 and 185 °F)
Table 3. Ambient Temperature Effects
NIST Type
Accuracy per 1.0 °C (1.8 °F) Change in Ambient Temperature(1)C
Temperature Range (°C)
RTD
Pt 50 ( = 0.00391)
• 0.004 °C (0.0072 °F)
NA
Pt 100 ( = 0.00391)
• 0.002 °C (0.0036 °F)
NA
Pt 100 ( = 0.00385)
• 0.003 °C (0.0054 °F)
NA
Pt 100 ( = 0.003916)
• 0.003 °C (0.0054 °F)
NA
Pt 200 ( = 0.003916)
• 0.004 °C (0.0072 °F)
NA
Pt 200 ( = 0.00385)
• 0.004 °C (0.0072 °F)
NA
Pt 500
• 0.003 °C (0.0054 °F)
NA
Pt 1000
• 0.003 °C (0.0054 °F)
NA
Cu 10
• 0.03 °C (0.054 °F)
NA
Cu 100 (a=428)
• 0.002 °C (0.0036 °F)
NA
Cu 50 (a=428)
• 0.004 °C (.0072 °F)
NA
Cu 100 (a=426)
• 0.002 °C (0.0036 °F)
NA
Cu 50 (a=426)
• 0.004 °C (.0072 °F)
NA
Ni 120
• 0.003 °C (0.0054 °F)
NA
Thermocouple (R = the value of the reading)
Type B
• 0.014 °C
• 0.032 °C - (0.0025% of (R - 300))
• 0.054 °C - (0.011% of (R - 100))
• R 1000
• 300  R < 1000
• 100  R < 300
Type E
• 0.005 °C + (0.00043% of R)
• All
Type J, DIN Type L
• 0.0054 °C + (0.00029% of R)
• 0.0054 °C + (0.0025% of |R|)
• R0
• R 0
Type K
• 0.0061 °C + (0.00054% of R)
• 0.0061 °C + (0.0025% of |R|)
• R0
• R 0
Type N
• 0.0068 °C + (0.00036% of R)
• All
Type R, Type S
• 0.016 °C
• 0.023 °C - (0.0036% of R)
• R  200
• R 200
Type T, DIN Type U
• 0.0064 °C
• 0.0064 °C + (0.0043% of |R|)
• R0
• R 0
GOST Type L
• 0.007 °C
• 0.007 °C + (0.003% of IRI)
• R 0
• R0
Millivolt
• 0.0005 mV
NA
2- and 3-wire Ohm
• 0.0084 ohms
NA
4–20 mA (Rosemount)
• 0.0001 mA
NA
4-20 mA (NAMUR)
• 0.0001 mA
NA
(1) Change in ambient is in reference to the calibration temperature of the transmitter (20 °C (68 °F) typical from the factory).
A-7
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Ambient Temperature Notes
Examples:
When using a Pt 100 ( = 0.00385) sensor input at 30 °C ambient
temperature:
• Digital Temperature Effects: 0.003 °C x (30 - 20) = .03 °C
• Worst Case Error: Digital + Digital Temperature Effects = 0.3 °C + .03 °C =
.33 °C
• Total Probable Error 0.30 2 + 0.03 2 = 0.30C
DIMENSIONAL
DRAWINGS
Junction Boxes with no entries (option codes JP1, JA1, and JS1)– external
dimensions are the same as those outlined for the other junction box
materials in this section.
Rosemount 848T
Top View
Security Switch
3-D View
Side View
1.7
(43)
Simulation Switch
6.7
(170)
3.7
(93)
Removable Wiring
Connection
Dimensions are in inches (millimeters)
A-8
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Aluminum/Plastic Junction Box—Cable Gland (option codes JA2 and JP2)
Top View
3-D View
10.24 (260)
Ground Screw
Side View
Front View
7.84 (199.2)
2.44 (62)
1.57 (40)
6.30 (160)
4.41 (112)
1.73 (44)
2.28 (58)
3.78 (96)
1.10 (28)
Dimensions are in inches (millimeters)
Stainless Steel Junction Box—Cable Gland (option code JS2)
Top View
3-D View
9.91 (231)
7.7 (196)
Ground Screw
Side View
Front View
9.14 (232.2)
1.8 (46)
1.1 (28)
7.72 (196)
6.61 (168)
1.73 (44)
4.0 (102)
2.4 (62)
1.2 (30)
1.8 (47)
Dimensions are in inches (millimeters)
A-9
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Aluminum/Plastic Junction Box—Conduit Entry (option codes JA3 and JP3)
Top View
3-D View
10.2 (260)
Front View
Side View
157 (40)
2.44 (62)
10.2 (260)
3.5 (89)
1.7 (42)
Five Plugged 0.86-in. diameter
holes suitable for installing 1/2-in.
NPT fittings
Dimensions are in inches (millimeters)
Stainless Steel Junction Box—Conduit Entry (option code JS3)
Top View
3-D View
9.1 (231)
7.7 (196)
Ground Screw
Front View
Side View
1.4 (35)
1.1 (27)
2.8 (70)
1.2 (30)
4.0 (102)
2.4 (62)
1.6 (42)
1.8 (4.7)
0.06 (1.5)
Five Plugged 0.86-in. diameter holes suitable for installing 1/2-in. NPT fittings
Dimensions are in inches (millimeters)
A-10
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Mounting Options
Aluminum/Plastic Junction Box
(styles JA and JP)
Front View
5.1
(130)
10.2
(260)
Side View
Stainless Steel Junction Box
(style JS)
Front View
Side View
4.5
(114)
6.6 (167) fully
assembled
7.5 (190) fully
assembled
Dimensions are in inches (millimeters)
Aluminum/Plastic Junction Box
Mounted on a Vertical Pipe
Stainless Steel Junction Box
Mounted on a Vertical Pipe
A-11
Reference Manual
Rosemount 848T
00809-0100-4697, Rev EA
October 2011
ORDERING INFORMATION
Table A-1. Rosemount 848T FOUNDATION fieldbus Ordering Information
★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.
__The Expanded offering is subject to additional delivery lead time.
Model
848T
Product Description
High Density Temperature Measurement Family
Transmitter Output
Standard
F
Standard
FOUNDATION fieldbus digital signal (includes AI, MAI, and ISEL function blocks, and Backup Link Active
Scheduler)
Product Certifications(1)
★
Rosemount
Junction
Box required?
Standard
Standard
I1
ATEX Intrinsic Safety
No
★
I3
NEPSI Intrinsic Safety
No
★
I4
TIIS Intrinsically Safety (FISCO) Type '1a’
No
★
H4
TIIS Intrinsic Safety (FISCO) Type '1b’
No
★
I5(2)
FM Intrinsically Safe
No
★
I6(2)
CSA Intrinsically Safe
No
★
I7
IECEx Intrinsic Safety
No
★
IA
ATEX FISCO Intrinsic Safety
No
★
IE
FM FISCO Intrinsically Safe
No
★
CSA FISCO Intrinsically Safe, Division 2
No
★
IG
IECEx FISCO (Intrinsic Safety)
No
★
N1
ATEX Type n (enclosure required)
Yes
★
N5
FM Class I, Division 2, and Dust Ignition-proof (enclosure required)
Yes
★
N6
CSA Class I, Division 2
No
★
N7
IECEx Type n (enclosure required)
Yes
★
NC
ATEX Type n Component (Ex nA nL)
No(3)
★
ND
ATEX Dust (enclosure required)
Yes
★
NJ
IECEx Type n Component (Ex nA nL)
No(3)
★
NK
FM Class 1, Division 2
No
★
NA
No Approval
No
★
CSA Explosion-proof, Dust Ignition-proof, Division 2 (JX3 enclosure required)
Yes(4)
IF(2)
Expanded
E6
Options (Include with selected model number)
Input Types
Standard
S001
S002(5)
Standard
RTD, Thermocouple, mV, Ohm Inputs
★
RTDs, Thermocouple, mV, Ohm and 4–20 mA Inputs
★
PlantWeb Advanced Diagnostics
Standard
D04
Standard
Measurement Validation Diagnostic
★
Transient Protection
Standard
T1
Standard
Integral Transient Protector
★
Mounting Bracket
B6
A-12
Mounting Bracket for 2-in. pipe mounting – SST bracket and bolts
★
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table A-1. Rosemount 848T FOUNDATION fieldbus Ordering Information
★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.
__The Expanded offering is subject to additional delivery lead time.
Enclosure Options
Standard
Standard
JP1
Plastic Junction Box; No Entries
★
JP2
Plastic Box, Cable Glands (9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable)
★
JP3
Plastic Box, Conduit Entries (5 Plugged Holes, suitable for installing 1/2-in. NPT fittings)
★
JA1
Aluminum Junction Box; No Entries
★
JA2
Aluminum Cable Glands (9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable)
★
JA3
Aluminum Conduit Entries (5 Plugged Holes, suitable for installing 1/2-in. NPT fittings)
★
JS1
Stainless Steel Junction Box; No Entries
★
JS2
Stainless Steel Box, Cable Glands (9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable)
★
JS3
Stainless Steel Box, Conduit Entries (5 Plugged Holes, suitable for installing 1/2-in. NPT fittings)
★
JX3(6)
Explosion-proof Box, Conduit Entries (4 Plugged Holes, suitable for installing 1/2-in. NPT fittings)
★
Software Configuration
Standard
C1
Standard
Custom Configuration of Date, Descriptor, Message and Wireless Parameters (Requires CDS with Order)
★
Line Filter
Standard
F5
Standard
★
50 Hz Line Voltage Filter
Calibration Certificate
Standard
Q4
Standard
★
Calibration Certificate (3-Point Calibration)
Shipboard Certification
Standard
Standard
SBS
American Bureau of Shipping (ABS) Type Approval
★
SLL
Lloyd's Register (LR) Type Approval
★
Special Temperature Test
Expanded
LT
Test to -60 °F (-51.1 °C)
Conduit Electrical Connector
Standard
Standard
★
GE(7)
M12, 4-pin, Male Connector (eurofast®)
GM(7)
A size Mini, 4-pin, Male Connector (minifast®)
Typical Model Number:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
848T
F
I5
S001
T1
B6
★
JA2
Consult factory for availability.
Available only with S001 option.
The Rosemount 848T ordered with component approval is not approved as a stand-alone unit. Additional system certification is required.
Enclosure Option JX3 must be ordered with Product Certification Code E6. (O-ring for the JX3 enclosure rated to -20 °C).
S002 is only available with Product Certification N5, N6, N1, NC, NK, and NA.
JX3 Explosion-proof enclosure rated to -4 °F (-20 °C).
Available with no approval or Intrinsically Safe approvals only. For FM Intrinsically Safe (option code I5), install in accordance with Rosemount drawing
00848-4402.
A-13
Reference Manual
Rosemount 848T
A-14
00809-0100-4697, Rev EA
October 2011
Reference Manual
00809-0100-4697, Rev EA
October 2011
Appendix B
Rosemount 848T
Product Certificates
Hazardous Locations Certificates . . . . . . . . . . . . . . . . . . . page B-1
Intrinsically Safe and Non-Incendive Installations . . . . . page B-11
Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page B-12
HAZARDOUS
LOCATIONS
CERTIFICATES
North American
Approvals
Factory Mutual (FM) Approvals
I5
Intrinsically Safe and Non-Incendive
Intrinsically Safe for use in Class I, Division 1, Groups A, B, C, D; when
installed per Rosemount drawing 00848-4404.
Temperature Code:
T4 (Tamb = –40 to 60 °C)
Non-Incendive for use in Class I, Division 2, Groups A, B, C, D (suitable
for use with Non-Incendive field wiring) when installed in accordance with
Rosemount Drawing 00848-4404.
Temperature Code:
T4A (Tamb = -40 to 85 °C)
T5 (Tamb = -40 to 70 °C)
Rosemount Enclosure Required.
Indoor Hazardous (Classified) Locations.
Table B-1. FM Approved Entity Parameters
Power/Bus
Vmax = 30 V
Imax = 300 mA
Pi = 1.3 W
Ci = 2.1 nF
Li = 0
Sensor(1)
VOC = 12.5 V
ISC= 4.8 mA
Po = 15 mW
CA = 1.2 F
LA = 1 H
(1) Entity parameters apply to entire device, not individual sensor channels.
Table B-2. Entity Parameters for Non Incendive Field Wiring
Power/Bus
Sensor(1)
Vmax = 42.4 V
Ci = 2.1nF
Li = 0
VOC = 12.5 V
ISC = 4.8 mA
Po = 15 mW
CA = 1.2 F
LA = 1 H
(1) Entity parameters apply to entire device, not individual sensor channel.
www.rosemount.com
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
IE
FISCO (Fieldbus Intrinsically Safe Concept) Intrinsic Safety
Intrinsically safe for use in Class I, Division 1, Groups A, B, C, D; when
installed in accordance with Rosemount Drawing 00848-4404.
Temperature Code:
T4 (Tamb = –40 to 60 °C)
Non-incendive for use in Class I, Division 2, Groups A, B, C, D (suitable
for use with non-incendive field wiring); when installed in accordance
with Rosemount Drawing 00848-4404.
Temperature Code:
T4A (Tamb = –40 to 85 °C)
T5 (Tamb = –40 to 70 °C)
Table B-3. Entity Parameters
Power/Bus
Sensor(1)
Vmax = 17.5 V
Imax = 380 mA
Pi = 5.32 W
Ci = 2.1nF
Li = 0
VOC = 12.5 V
ISC = 4.8 mA
Po = 15 mW
CA = 1.2 F
LA = 1 H
(1) Entity parameters apply to entire device, not individual sensor channels.
N5 Dust Ignition-Proof
For use in Class II, III, Division 1, Groups E, F, G. Class I, Division 2,
Groups A, B, C, D;
Non-incendive for Class 1, Division 2, Groups A, B, C, D when installed
to Rosemount Control Drawing 00848-4404.
Rosemount Enclosure Required.
Valid with both S001 and S002 options.
Temperature Code:
T4A (Tamb = –40 to 85 °C)
T5 (Tamb = –40 to 70 °C)
NK Non-Incendive for use in Class I, Division 2, Groups A, B, C, D (suitable
for use with Non-Incendive field wiring) when installed in accordance with
Rosemount Drawing 00848-4404.
Temperature Code:
T4A (Tamb = -40 to 85 °C)
T5 (Tamb = -40 to 70 °C)
Rosemount Enclosure Required.
Indoor Hazardous (Classified) Locations.
Table B-4. FM Approved Entity Parameters(1)
Power/Bus
Sensor
Vmax = 42.4 V
Ci = 2.1 F
Li = 0 H
VOC = 12.5 V
ISC = 4.8 mA
Po = 15 mW
CA = 1.2 F
LA = 1 H
(1) Intrinsically safe and non-incendive parameters.
B-2
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Canadian Standards Association (CSA) Certifications
E6 Explosion-Proof and Dust Ignition-Proof
Class I, Division 1, Groups B, C, and D.
Class II, Division 1, Groups E, F, and G.
Class III
Must be installed in enclosure option JX3.
Install per drawing 00848-1041.
Conduit seal not required.
Suitable for use in Class I, Division 2, Groups A, B, C, D. when installed
per Rosemount drawing 00848-4405.
Temperature Code:
T3C = (– 50 Tamb  60 °C)
Must be installed in a suitable enclosure as determined acceptable by
the local inspection authority.
I6
Intrinsically Safe, Division 2
For use in Class I, Division 1, Groups A, B, C, D; when installed per
Rosemount drawing 00848-4405.
Temperature Code:
T3C (Tamb = –50 to 60 °C)
Suitable for Class I, Division 2, Groups A, B, C, D. Rated 42.4 VDC max.
Not valid with S002 option.
Table B-5. CSA Approved Entity Parameters
Power/Bus
Sensor(1)
Vmax = 30 V
Imax = 300 mA
Ci = 2.1nF
Li = 0
VOC = 12.5 V
ISC = 4.8 mA
Po = 15 mW
CA = 1.2 F
LA = 1 H
(1) Entity parameters apply to entire device, not individual sensor channels.
IF
FISCO (Intrinsically Safe)
For use in Class I, Division 1, Groups A, B, C, D; when installed per
Rosemount drawing 00848-4405.
Temperature Code:
T3C (Tamb = –50 to 60 °C)
Suitable for Class I, Division 2, Groups A, B, C, D. Rated 42.4 VDC max.
Not valid with S002 option.
Table B-6. CSA Approved Entity Parameters
Power/Bus
Sensor(1)
Ui = 17.5 V
Ii = 380 mA
Pi = 5.32 W
Ci = 2.1nF
Li = 0
VOC = 12.5 V
ISC = 4.8 mA
Po = 15 mW
Ca = 1.2 F
La = 1 H
(1) Entity parameters apply to entire device, not individual sensor channels.
B-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
N6 Class I, Division 2
Suitable for use in Class I, Division 2, Groups A, B, C, D. when installed
per Rosemount drawing 00848-4405.
Temperature Code:
T3C = (–50 Ta  60 °C)
Must be installed in a suitable enclosure as determined acceptable by
the local inspection authority.
European Approvals
ATEX Certifications
I1
Intrinsic Safety
Certification Number: Baseefa09ATEX0093X
ATEX Marking
II 1 G
Ex ia IIC T4 (Tamb = –50 to 60 °C)
1180
Table B-7. ATEX Approved Entity Parameters
Power/Bus
Sensor
Ui = 30 V
Ii = 300 mA
Pi = 1.3 W
Ci = 0
Li = 0
Uo = 12.5 V
Io = 4.8 mA
Po = 15 mW
Ci = 1.2 F
Li = 1 H
Special Conditions for Safe Use (x):
IA
1.
This apparatus must be installed in an enclosure which affords it a
degree of protection of at least IP20. Non-metallic enclosures must
have a surface resistance of less than 1Gohm. Light alloy or
zirconium enclosures must be protected from impact and friction
when installed.
2.
The apparatus will not meet the 500V rms isolation test required by
Clause 6.4.12 on EN 60079-11:2007. This must be taken into account
when installing the apparatus.
FISCO (Fieldbus Intrinsically Safe Concept) Intrinsic Safety
Certificate Number: BASEEFA09ATEX0093X
ATEX Marking
II 1 G
Ex ia IIC T4 (Tamb = –50 to 60 °C)
1180
Table B-8. ATEX Approved Entity Parameters
B-4
Power/Bus
Sensor
Ui = 17.5 V
Ii = 380 mA
Pi = 5.32 W
Ci = 0
Li = 0
Uo = 12.5 V
Io = 4.8 mA
Po = 15 mW
Ci = 1.2 F
Li = 1 H
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Special Conditions for Safe Use (x):
1.
This apparatus must be installed in an enclosure which affords it a
degree of protection of at least IP20. Non-metallic enclosures must
have a surface resistance of less than 1Gohm. Light alloy or
zirconium enclosures must be protected from impact and friction
when installed.
2.
The apparatus will not meet the 500V rms isolation test required by
Clause 6.4.12 on EN 60079-11:2007. This must be taken into account
when installing the apparatus.
NE ATEX TYPE ‘n’ APPROVAL
Certification Number: BASEFFA09ATEX0095X
ATEX Marking
II 3 G
Ex nA nL IIC T5 (Tamb = –40 to 65 °C)
Table B-9. Baseefa Approved Entity Parameters
Power/Bus
Sensor
Ui = 42.4 Vdc
Uo = 5 Vdc
Ci = 0
Li = 0
Io = 2.5 mA
Co = 1000 F
Lo = 1000 mH
Special Conditions for Safe Use (x):
1.
Provisions shall be made, external to the apparatus to prevent the
rated voltage (42.4 Vdc) from being exceeded by transient
disturbances of more than 40%.
2.
The ambient temperature range of use shall be the most restrictive of
the apparatus, cable gland, or blanking plug.
NOTE:
NE is valid with S001 Input Type ONLY
N1 ATEX Type n
Certification Number: Baseefa09ATEX0095X
ATEX Marking
II 3 G
Ex nL IIC T5 (Tamb = –40 to 65 °C)
Table B-10. Entity Parameters
Power/Bus
Sensor
Ui = 42.4 Vdc
Ci = 0
Li = 0
Uo = 12.5 Vdc
Io = 4.8 mA
Po = 15 mW
Co = 1.2 F
Lo = 1 H
B-5
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Special Conditions for Safe Use (x):
1.
Provisions shall be made, external to the apparatus, to prevent the
rated voltage of the apparatus supply is not exceeded by transient
disturbances of more than 40%
2.
The electrical circuit is connected directly to earth; this must be taken
into account when installing the apparatus.
NC ATEX Type n Component
Certification Number: Baseefa09ATEX0094U
ATEX Marking
II 3 G
Ex nA nL IIC T4 (Tamb = –50 to 85 °C)
Ex nA nL IIC T5 (Tamb = –50 to 70 °C)
Special Conditions for Safe Use (x):
1.
The component must be housed in a suitable certified enclosure that
provides a degree of protection of at least IP54 and meets the
relevant material and environmental requirements of EN 60079-0,
and EN-60079-15.
2.
Provisions shall be made, external to the apparatus, to prevent the
rated voltage (42.4 VDC) being exceeded by transient disturbances
of more than 40%.
3.
The electrical circuit is connected directly to earth: this must be taken
into account when installing the apparatus.
NOTE
NC is valid with S001 Input Type ONLY
ND ATEX Dust Ignition Proof
Certification Number: BAS01ATEX1315X
ATEX Marking
II 1 D
T90C (Tamb = – 40 to 65 °C) IP66
Special Conditions for Safe Use (x):
1. The user must ensure that the maximum rated voltage and current
(42.4 volts, 22 mA, DC) are not exceeded. All connections to other
apparatus or associated apparatus shall have control over this
voltage and current equivalent to a category “ib” circuit according to
EN50020.
2. Component approved EEx e cable entries must be used which
maintain the ingress protection of the enclosure to at least IP66.
3. Any unused cable entry holes must be filled with component
approved EEx e blanking plugs.
4. The ambient temperature range of use shall be the most restrictive of
the apparatus, cable gland, or blanking plug.
Table B-11. Baseefa Approved Entity Parameters
Power/Bus
Ui = 42.4 V
Ci = 0
Li = 0
B-6
Sensor
Uo = 5V dc
Io = 2.5 mA
Co = 1000 F
Lo = 1 H
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Special Conditions of Safe Use (x):
1. The component must be housed in a suitable certified enclosure.
2. Provisions shall be made, external to the apparatus, to prevent the
rated voltage (42.2 V dc) being exceeded by transient disturbances of
more than 40%.
IECEx Certifications
I7
IECEx Intrinsic Safety
Certificate No.: IECExBAS09.0030X
Ex ia IIC T4 (Tamb = –50 to 60 °C)
Table B-12. IECEx Approved Entity Parameters
Power/Bus
Sensor
Ui = 30 V
Ii = 300 mA
Pi = 1.3 W
Ci = 2.1 F
Li = 0
Uo = 12.5 V
Io = 4.8 mA
Po = 15 mW
Ci = 1.2 F
Li = 1 H
Special Conditions of Safe Use (x):
IG
1.
The apparatus must be installed in an enclosure that provides a
degree of protection of at least IP20. Non-metallic enclosures must be
suitable to prevent electrostatic hazards and light alloy or zirconium
enclosures must be protected from impact and friction when installed.
2.
The apparatus is not capable of withstanding the 500V isolation test
required by IEC 60079-11: 2006 clause 6.3.12. This must be taken
into account when installing the apparatus.
IECEx FISCO
Certificate No.: IECExBAS09.0030X
Ex ia IIC T4 (Tamb = – 50 to 60 °C)
Table B-13. IECEx Approved Entity Parameters
Power/Bus
Sensor
Ui =17.5 Vdc
Ii = 380 mA
Pi = 5.32 W
Ci = 2.1 F
Li = 0
Uo = 12.5 Vdc
Io = 4.8 mA
Po = 15 mW
Ci = 1.2 F
Li = 1 H
Special Conditions of Safe Use (x):
1.
The apparatus must be installed in an enclosure that provides a
degree of protection of at least IP20. Non-metallic enclosures must be
suitable to prevent electrostatic hazards and light alloy or zirconium
enclosures must be protected from impact and friction when installed.
2.
The apparatus is not capable of withstanding the 500V isolation test
required by IEC 60079-11: 2006 clause 6.3.12. This must be taken
into account when installing the apparatus.
B-7
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
N7 IECEx Type n Approval
Certificate No.” IECExBAS09.0032X
Ex Na nL IIC T5 (Tamb = – 40 to 65 °C)
NOTE:
N7 is valid with S001 and S002 Input Types
Table B-14. IECEx Approved Entity Parameters
Power/Bus
Ui = 42.4 Vdc
Ci = 0
Li = 0
Sensor
Uo = 5 Vdc
Io = 2.5 mA
Co = 1000 F
Lo = 1000 mH
Special Conditions of Safe Use:
1.
The component must be housed in a suitable component certified
enclosure that provides a degree of protection of at least IP54 and
meets the relevant material and environmental requirements of IEC
60079-0: 2004 & IEC 60079-15: 2005.
2.
Provision must be made, external to the component, to ensure the
rated voltage of the component supply is not exceeded by transient
disturbances of more than 40%.
3.
The electrical circuit is connected directly to earth; this must be taken
into account when installing the component.
NJ IECEx Type n COMPONENT Approval
Certification Number: IECExBAS09.0031U
EEx nA nL IIC T4 (Tamb = -50 to 85 °C)
EEx nA nL IIC T5 (Tamb = -50 to 70 °C)
NOTE:
NJ is valid with S001 and S002 Input Types
Table B-15. IECEx Approved Entity Parameters
Power/Bus
Ui = 42.4 Vdc
Ci = 0
Li = 0
Sensor
Uo = 5 Vdc
Io = 2.5 mA
Co = 1000 F
Lo = 1000 mH
Special Conditions of Safe Use:
B-8
1.
The component must be housed in a suitable component certified
enclosure that provides a degree of protection of at least IP54 and
meets the relevant material and environmental requirements of IEC
60079-0: 2004 & IEC 60079-15: 2005.
2.
Provision must be made, external to the component, to ensure the
rated voltage of the component supply is not exceeded by transient
disturbances of more than 40%.
3.
The electrical circuit is connected directly to earth; this must be taken
into account when installing the component.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
China (NEPSI)Certifications
I3 Intrinsic Safety
Ex ia IIC T4
Certification Number: GYJ111365X
Special Conditions for Safe Use (x):
2.1. Only when temperature transmitter is installed in IP
20(GB4208-2008) housing, it could be used in hazardous location.
The metallic housing should observe the requirements of
GB3836.1-2000 Clause 8. The non-metallic housing should observe
the requirements of GB3836.1-2000 Clause 7.3. This apparatus is
not capable of withstanding the 500V rms insulation test required by
Clause 6.4.12 of GB3836.4-2000.
2.2. The ambient temperature range is:
Output
T code
Ambient temperature
F
T4
-50 °C < Ta < + 60 °C
2.3. Parameters:
Terminals of power/loop (1-2):
Maximum
Output Voltage:
Maximum
Maximum
Uo (V)
Output Current: Output Power:
Io (mA)
Po (mW)
Output
Maximum external
parameters:
Co (F)
Lo (H)
F
30
300
1.3
2.1
0
F (FISCO)
17.5
380
5.32
2.1
0
NOTE
Non-FISCO parameters listed above must be derived from a linear supply
with a resistance limited output.
Terminals of sensor:
Output
Maximum
Maximum
Maximum
Terminals Output Voltage: Output Current: Output Power: Maximum external
Uo (V)
Io (mA)
Po (mW)
parameters:
Co (F)
F
1-8
12.5
4.8
15
Lo (H)
1.2
1
2.4. The product complies to the requirements for FISCO field devices
specified in IEC60079-27: 2008. For the connection of an intrinsically
safe circuit in accordance FISCO model, FISCO parameters of this
product are as above.
2.5. The product should be used with Ex-certified associated apparatus to
establish explosion protection system that can be used in explosive
gas atmospheres. Wiring and terminals should comply with the
instruction manual of the product and associated apparatus.
2.6. The cables between this product and associated apparatus should be
shielded cables (the cables must have insulated shield). The shielded
cable has to be grounded reliably in non-hazardous area.
B-9
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
2.7. End users are not permitted to change any component’s insides, but
to settle the problem, in conjunction with manufacturer to avoid
damage to the product.
2.8. During installation, use and maintenance of this product, observe
following standards:
GB3836.13-1997 "Electrical apparatus for explosive gas
atmospheres Part 13: Repair and overhaul for apparatus used in
explosive gas atmospheres."
GB3836.15-2000 "Electrical apparatus for explosive gas atmospheres
Part 15: Electrical installations in hazardous area (other than mines)."
GB3836.16-2006 "Electrical apparatus for explosive gas atmospheres
Part 16: Inspection and maintenance of electrical installation (other
than mines)."
GB50257-1996 "Code for construction and acceptance of electric
device for explosion atmospheres and fire hazard electrical
equipment installation engineering."
Japanese Certifications
I4 TISS Intrinsic Safety FISCO Type ‘1a’
Ex ia IIC T4
Certification Number: TC19713
H4 TISS Intrinsic Safety FISCO Type ‘1b’
Ex ia IIB T4
Certification Number: TC19714
B-10
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
INTRINSICALLY SAFE AND NON-INCENDIVE INSTALLATIONS
Zone 2
(category 3)
Approval
Safe Area
Division 2
Zone 1
(category 2)
Zone 0
(category 1)
Division 1
GAS INSTALLATIONS
I5, I6, I1,
I7, IE, IA
Approved I.S. or
FISCO barrier
848T without
enclosure
Non-approved
power supply
N1, N7
848T with enclosure
N5
Non-approved
power supply
848T with enclosure
I5, I6, IE
Approved
non-incendive
power supply
or barrier
848T without enclosure
DUST INSTALLATIONS
N5, ND
Non-approved
power supply
848T with enclosure
Standard cable
Division 2 wiring
B-11
Reference Manual
Rosemount 848T
INSTALLATION
DRAWINGS
00809-0100-4697, Rev EA
October 2011
The installation guidelines presented by the drawings must be followed in
order to maintain certified ratings for installed transmitters.
Rosemount Drawing 00848-4404, 3 Sheets
Factory Mutual Intrinsic Safety/ FISCO Installation Drawing
Rosemount Drawing 00848-4405, 2 Sheets
Canadian Standards Association Intrinsic Safety/FISCO Installation Drawing
B-12
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary
Figure B-1. FM Intrinsic Safety/ FISCO
B-13
Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary
Reference Manual
Rosemount 848T
B-14
00809-0100-4697, Rev EA
October 2011
00809-0100-4697, Rev EA
October 2011
Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary
Reference Manual
Rosemount 848T
B-15
Reference Manual
Rosemount 848T
00809-0100-4697, Rev EA
October 2011
Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary
Figure B-2. CSA Intrinsic Safety/ FISCO
B-16
00809-0100-4697, Rev EA
October 2011
Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary
Reference Manual
Rosemount 848T
B-17
Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary
Reference Manual
Rosemount 848T
B-18
00809-0100-4697, Rev EA
October 2011
Reference Manual
00809-0100-4697, Rev EA
October 2011
Appendix C
Rosemount 848T
FOUNDATION™ fieldbus
Technology
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-1
Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-1
Device Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-3
Block Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-3
Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . page C-4
OVERVIEW
FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop
communication protocol that interconnects devices such as transmitters,
sensors, actuators, and valve controllers. Fieldbus is a Local Area Network
(LAN) for instruments that are used in both process and manufacturing
automation, having the built-in capability to distribute the control applications
across the network. The fieldbus environment is the base level group of digital
networks and the hierarchy of plant networks.
The FOUNDATION fieldbus retains the desirable features of the 4–20 mA
analog system, including standardized physical interface to the wire,
bus-powered devices on a single pair of wires, and intrinsic safety options. It
also enables the following capabilities:
•
Increased capabilities due to full digital communication.
•
Reduced wiring and wire terminations due to multiple devices on one
pair of wires.
•
Increased supplier selection due to interoperability
•
Reduced loading on control room equipment due to the distribution of
some control and input/output functions to field devices.
FOUNDATION fieldbus devices work together to provide I/O and control for
automated processes and operations. The Fieldbus FOUNDATION provides a
framework for describing these systems as a collection of physical devices
interconnected by a fieldbus network. One of the ways that the physical
devices are used is to perform their portion of the total system operation by
implementing one or more function blocks.
FUNCTION BLOCKS
www.rosemount.com
Function blocks perform process control functions, such as analog input (AI)
and analog output (AO) functions as well as proportional-integral-derivative
(PID) functions. The standard function blocks provide a common structure for
defining function block inputs, outputs, control parameters, events, alarms,
and modes, and combining them into a process that can be implemented
within a single device or over the fieldbus network. This simplifies the
identification of characteristics that are common to function blocks.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
The Fieldbus FOUNDATION has established the function blocks by defining a
small set of parameters used in all function blocks called universal
parameters. The FOUNDATION has also defined a standard set of function
block classes, such as input, output, control, and calculation blocks. Each of
these classes has a small set of parameters established for it. They have also
published definitions for transducer blocks commonly used with standard
function blocks. Examples include temperature, pressure, level, and flow
transducer blocks.
The FOUNDATION specifications and definitions allow vendors to add their own
parameters by importing and subclassing specified classes. This approach
permits extending function block definitions as new requirements are
discovered and as technology advances.
Figure C-1 illustrates the internal structure of a function block. When
execution begins, input parameter values from other blocks are snapped-in by
the block. The input snap process ensures that these values do not change
during the block execution. New values received for these parameters do not
affect the snapped values and will not be used by the function block during
the current execution.
Figure C-1. Function
Block Internal Structure
Input Events
Input
Parameter
Linkages
Input
Snap
Status
Execution
Control
Output Events
Processing
Algorithm
Output
Snap
Output
Parameter
Linkages
Status
Once the inputs are snapped, the algorithm operates on them, generating
outputs as it progresses. Algorithm executions are controlled through the
setting of contained parameters. Contained parameters are internal to
function blocks and do not appear as normal input and output parameters.
However, they may be accessed and modified remotely, as specified by the
function block.
Input events may affect the operation of the algorithm. An execution control
function regulates the receipt of input events and the generation of output
events during execution of the algorithm. Upon completion of the algorithm,
the data internal to the block is saved for use in the next execution, and the
output data is snapped, releasing it for use by other function blocks.
A block is a tagged logical processing unit. The tag is the name of the block.
System management services locate a block by its tag. Thus the service
personnel need only know the tag of the block to access or change the
appropriate block parameters.
Function blocks are also capable of performing short-term data collection and
storage for reviewing their behavior.
C-2
Reference Manual
00809-0100-4697, Rev EA
October 2011
DEVICE DESCRIPTIONS
Rosemount 848T
Device Descriptions (DD) are specified tool definitions that are associated
with the Resource and Transducer Blocks. Device descriptions provide the
definition and description of the function blocks and their parameters.
To promote consistency of definition and understanding, descriptive
information, such as data type and length, is maintained in the device
description. Device Descriptions are written using an open language called
the Device Description Language (DDL). Parameter transfers between
function blocks can be easily verified because all parameters are described
using the same language. Once written, the device description can be stored
on an external medium, such as a CD-ROM or diskette. Users can then read
the device description from the external medium. The use of an open
language in the device description permits interoperability of function blocks
within devices from various vendors. Additionally, human interface devices,
such as operator consoles and computers, do not have to be programmed
specifically for each type of device on the bus. Instead their displays and
interactions with devices are driven from the device descriptions.
Device descriptions may also include a set of processing routines called
methods. Methods provide a procedure for accessing and manipulating
parameters within a device.
BLOCK OPERATION
In addition to function blocks, fieldbus devices contain two other block types
to support the function blocks. These are the resource block and the
transducer block.
Instrument- Specific
Function Blocks
Resource Blocks
Resource blocks contain the hardware–specific characteristics associated
with a device; they have no input or output parameters. The algorithm within a
resource block monitors and controls the general operation of the physical
device hardware. The execution of this algorithm is dependent on the
characteristics of the physical device, as defined by the manufacturer. As a
result, the algorithm may cause the generation of events. There is only one
resource block defined for a device. For example, when the mode of a
resource block is “Out of Service (OOS),” it impacts all of the other blocks.
Transducer Blocks
Transducer blocks connect function blocks to local input/output functions.
They read sensor hardware and write to effector (actuator) hardware. This
permits the transducer block to execute as frequently as necessary to obtain
good data from sensors and ensure proper writes to the actuator without
burdening the function blocks that use the data. The transducer block also
isolates the function block from the vendor–specific characteristics of the
physical I/O.
Alerts
When an alert occurs, execution control sends an event notification and waits
a specified period of time for an acknowledgment to be received. This occurs
even if the condition that caused the alert no longer exists. If the
acknowledgment is not received within the pre-specified time-out period, the
event notification is retransmitted, assuring that alert messages are not lost.
C-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Two types of alerts are defined for the block: events and alarms. Events are
used to report a status change when a block leaves a particular state, such as
when a parameter crosses a threshold. Alarms not only report a status
change when a block leaves a particular state, but also report when it returns
back to that state.
NETWORK
COMMUNICATION
Figure C-2 illustrates a simple fieldbus network consisting
of a single segment (link).
Figure C-2. Simple, Single-Link
Fieldbus Network
Fieldbus Link
LAS
Link Master
Basic Devices and/or link master devices
Link Active Scheduler
(LAS)
All links have one Link Active Scheduler (LAS). The LAS operates as the bus
arbiter for the link. The LAS does the following:
•
recognizes and adds new devices to the link.
•
removes non-responsive devices from the link.
•
distributes Data Link Time (DL) and Link Scheduling Time (LS) on the
link. DL is a network-wide time periodically distributed by the LAS to
synchronize all device clocks on the bus. LS time is a link-specific time
represented as an offset from DL. It is used to indicate when the LAS
on each link begins and repeats its schedule. It is used by system
management to synchronize function block execution with the data
transfers scheduled by the LAS.
•
polls devices for process loop data at scheduled transmission times.
•
distributes a priority-driven token to devices between
scheduled transmissions.
Any device on the link may become the LAS. The devices that are capable of
becoming the LAS are called Link Master devices (LM). All other devices are
referred to as basic devices. When a segment first starts up, or upon failure of
the existing LAS, the link master devices on the segment bid to become the
LAS. The link master that wins the bid begins operating as the LAS
immediately upon completion of the bidding process. Link masters that do not
become the LAS act as basic devices. However, the link masters can act as
LAS backups by monitoring the link for failure of the LAS and then bidding to
become the LAS when a LAS failure is detected.
Only one device can communicate at a time. Permission to communicate on
the bus is controlled by a centralized token passed between devices by the
LAS. Only the device with the token can communicate. The LAS maintains a
list of all devices that need access to the bus. This list is called the “Live List.”
Two types of tokens are used by the LAS. A time-critical token, Compel Data
(CD), is sent by the LAS according to a schedule. A non-time critical token,
pass token (PT), is sent by the LAS to each device in ascending numerical
order according to address.
C-4
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
There may be many LM devices on a segment but only the LAS is actively
controlling communication traffic. The remaining LM devices on the segment
are in a stand-by state, ready to take over if the primary LAS fails. This is
achieved by constantly monitoring the communication traffic on the bus and
determining if activity is not present. Since there can be multiple LM devices
on the segment when the primary LAS fails, the device with the lowest node
address will become the primary LAS and take control of the bus. Using this
strategy, multiple LAS failures can be handled with no loss of the LAS
capability of the communications bus.
LAS Parameters
There are many bus communication parameters but only a few are used. For
standard RS-232 communications, the configuration parameters are baud
rate, start / stop bits, and parity. The key parameters for H1 FOUNDATION
fieldbus are as follows.
•
Slot Time (ST) – Used during the bus master election process. It is the
maximum amount of time permitted for device A to send a message to
device B. Slot time is a parameter which defines a worst case delay
which includes internal delay in the sending device and the receiving
device. Increasing the value of ST slows down bus traffic because a
LAS device must wait longer prior to determining that the LM is down.
•
Minimum Inter-PDU Delay (MID) – The minimum gap between two
messages on the fieldbus segment or it is the amount of time between
the last byte of one message and the first byte of the next message.
The units of the MID are octets. An octet is 256 s, hence the units for
MID are approximately 1/4 ms. This would mean an MID of 16 would
specify approximately a minimum of 4 ms between messages on the
Fieldbus. Increasing the value of MID slows down bus traffic because a
larger “gap” between messages occurs.
•
Maximum Response (MRD) – Defines the maximum amount of time
permitted to respond to an immediate response request, e.g. CD, PT.
When a published value is requested using the CD command, the MRD
defines how long before the device publishes the data. Increasing this
parameter will slow down the bus traffic by decreasing how fast CDs
can be put onto the network. The MRD is measured in units of ST.
•
Time Synchronization Class (TSC) – A variable that defines how long
the device can estimate its time before drifting out of specific limits. The
LM will periodically send out time update messages to synchronize
devices on the segment. Decreasing the parameter number increases
the number of times that time distribution messages must be published,
increasing bus traffic and overhead for the LM device. See Figure C-3.
Figure C-3. LAS Parameter
diagram
FB 1
C
D
MID
Data
MID
FB 2
MID x ST
C-5
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Backup LAS
A LM device is one that has the ability to control the communications on the
bus. The LAS is the LM capable device that is currently in control of the bus.
While there can be many LM devices acting as backups, there can only be
one LAS. The LAS is typically a host system but for stand-alone applications,
a device may be providing the role of primary LAS.
Addressing
To setup, configure, and communicate with other devices on a segment, a
device must be assigned a permanent address. Unless requested otherwise,
it is assigned a temporary address when shipped from the factory.
FOUNDATION fieldbus uses addresses between 0 and 255. Addresses 0
through 15 are reserved for group addressing and for use by the data link
layer.
If there are two or more devices on a segment with the same address, the first
device to start up will use the assigned address. Each of the other devices will
be given one of the four temporary addresses. If a temporary address is not
available, the device will be unavailable until a temporary address is available.
Use the host system documentation to commission a device and assign a
permanent address.
Scheduled Transfers
Information is transferred between devices over the FOUNDATION fieldbus
using three different types of reporting.
Publisher/Subscriber
This type of reporting is used to transfer critical process loop data, such as the
process variable. The data producers (publishers) post the data in a buffer
that is transmitted to the subscriber, when the publisher receives the Compel
Data (CD). The buffer contains only one copy of the data. New data
completely overwrites previous data. Updates to published data are
transferred simultaneously to all subscribers in a single broadcast. Transfers
of this type can be scheduled on a precisely periodic basis.
Report Distribution
This type of reporting is used to broadcast and multicast event and trend
reports. The destination address may be predefined so that all reports are
sent to the same address, or it may be provided separately with each report.
Transfers of this type are queued. They are delivered to the receivers in the
order transmitted, although there may be gaps due to corrupted transfers.
These transfers are unscheduled and occur between scheduled transfers at a
given priority.
Client/Server
This type of reporting is used for request/response exchanges between pairs
of devices. Like Report Distribution reporting, the transfers are queued,
unscheduled, and prioritized. Queued means the messages are sent and
received in the order submitted for transmission, according to their priority,
without overwriting previous messages. However, unlike Report Distribution,
these transfers are flow controlled and employ a retransmission procedure to
recover from corrupted transfers.
C-6
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Figure C-4 diagrams the method of scheduled data transfer. Scheduled data
transfers are typically used for the regular cyclic transfer of process loop data
between devices on the fieldbus. Scheduled transfers use publisher/
subscriber type of reporting for data transfer. The LAS maintains a list of
transmit times for all publishers in all devices that need to be cyclically
transmitted. When it is time for a device to publish data, the LAS issues a CD
message to the device. Upon receipt of the CD, the device broadcasts or
“publishes” the data to all devices on the fieldbus. Any device that is
configured to receive the data is called a “subscriber.”
Figure C-4. Scheduled Data
Transfer
LAS
Schedule
X, Y, Z
DT(A)
CD(X,A)
A B
C A
D A
P S
P
P
Device X
S
Device Y
S
Device Z
LAS = Link Active Scheduler
P = Publisher
S = Subscriber
CD = Compel Data
DT = Data Transfer Packet
Unscheduled Transfers
Figure C-5 diagrams an unscheduled transfer. Unscheduled transfers are
used for things like user-initiated changes, including set point changes, mode
changes, tuning changes, and upload/download. Unscheduled transfers use
either report distribution or client/server type of reporting for transferring data.
All of the devices on the FOUNDATION fieldbus are given a chance to send
unscheduled messages between transmissions of scheduled data. The LAS
grants permission to a device to use the fieldbus by issuing a pass token (PT)
message to the device. When the device receives the PT, it is allowed to send
messages until it has finished or until the “maximum token hold time” has
expired, whichever is the shorter time. The message may be sent to a single
destination or to multiple destinations.
Figure C-5. Unscheduled Data
Transfer
LAS
PT(Z)
Schedule
X, Y, Z
DT(M)
A
B
C
A
D
M
P
S
Device X
P = Publisher
S = Subscriber
A
M
P
S
Device Y
PT = Pass Token
P
S
Device Z
M = Message
C-7
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Function Block
Scheduling
Figure C-6 shows an example of a link schedule. A single iteration of the
link-wide schedule is called the macrocycle. When the system is configured
and the function blocks are linked, a master link-wide schedule is created for
the LAS. Each device maintains its portion of the link-wide schedule, known
as the Function Block Schedule. The Function Block Schedule indicates when
the function blocks for the device are to be executed. The scheduled
execution time for each function block is represented as an offset from the
beginning of the macrocycle start time.
Figure C-6. Example Link
Schedule Showing Scheduled
and Unscheduled
Communication
Macrocycle Start Time
Offset from macrocycle
start time = 0 for AI
Execution
Device 1
AI
Scheduled
Communication
Sequence
Repeats
AI
Offset from macrocycle start
time = 20 for AI Communication
Unscheduled
Communication
Offset from macrocycle start
time = 30 for PID Execution
Device 2
PID
AO
PID
AO
Offset from macrocycle start
time = 50 for AO Execution
Macrocycle
To support synchronization of schedules, periodically Link Scheduling (LS)
time is distributed. The beginning of the macrocycle represents a common
starting time for all Function Block schedules on a link and for the LAS
link-wide schedule. This permits function block executions and their
corresponding data transfers to be synchronized in time.
C-8
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Appendix D
Function Blocks
Analog Input (AI) Function Block . . . . . . . . . . . . . . . . . . . page D-1
Multiple Analog Input (MAI) Function Block . . . . . . . . . . page D-9
Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . . page D-15
ANALOG INPUT (AI)
FUNCTION BLOCK
The Analog Input (AI) function block processes field device measurements
and makes them available to other function blocks. The output value from the
AI block is in engineering units and contains a status indicating the quality of
the measurement. The measuring device may have several measurements or
derived values available in different channels. Use the channel number to
define the variable that the AI block processes.
OUT_D
AI
OUT
Out = The block output value and status
Out_D = Discrete output that signals a
selected alarm condition
The AI block supports alarming, signal scaling, signal filtering, signal status
calculation, mode control, and simulation. In Automatic mode, the block’s
output parameter (OUT) reflects the process variable (PV) value and status.
In Manual mode, OUT may be set manually. The Manual mode is reflected on
the output status. A discrete output (OUT_D) is provided to indicate whether a
selected alarm condition is active. Alarm detection is based on the OUT value
and user specified alarm limits. The block execution time is 30 ms.
Table D-1. Analog Input Function Block Parameters
Number
Parameter
Units
Description
01
ST_REV
None
02
03
TAG_DESC
STRATEGY
None
None
04
ALERT_KEY
None
05
MODE_BLK
None
06
BLOCK_ERR
None
07
08
PV
OUT
09
SIMULATE
www.rosemount.com
EU of XD_SCALE
EU of OUT_SCALE
or XD_SCALE if in
direct L_TYPE
None
The revision level of the static data associated with the function block. The
revision value will be incremented each time a static parameter value in the block is
changed.
The user description of the intended application of the block.
The strategy field can be used to identify a grouping of blocks. This data is not
checked or processed by the block.
The identification number of the plant unit. This information may be used in the host
for sorting alarms, etc.
The actual, target, permitted, and normal modes of the block.
Actual: The mode the “block is currently in”
Target: The mode to “go to”
Permitted: Allowed modes that target may take on
Normal: Most common mode for target
This parameter reflects the error status associated with the hardware or software
components associated with a block. It is a bit string, so that multiple errors may be
shown.
The process variable used in block execution.
The block output value and status.
A group of data that contains the current transducer value and status, the simulated
transducer value and status, and the enable/disable bit.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table D-1. Analog Input Function Block Parameters
Number
Parameter
10
XD_SCALE
None
11
OUT_SCALE
None
12
GRANT_DENY
None
13
IO_OPTS
None
14
STATUS_OPTS
None
15
CHANNEL
None
16
L_TYPE
None
17
18
LOW_CUT
PV_FTIME
%
Seconds
19
FIELD_VAL
Percent
20
21
UPDATE_EVT
BLOCK_ALM
None
None
22
ALARM_SUM
None
23
24
ACK_OPTION
ALARM_HYS
None
Percent
25
26
27
28
29
30
31
32
33
HI_HI_PRI
HI_HI_LIM
HI_PRI
HI_LIM
LO_PRI
LO_LIM
LO_LO_PRI
LO_LO_LIM
HI_HI_ALM
34
HI_ALM
None
35
LO_ALM
None
D-2
Units
Description
None
EU of PV_SCALE
None
EU of PV_SCALE
None
EU of PV_SCALE
None
EU of PV_SCALE
None
The high and low scale values, engineering units code, and number of digits to
the right of the decimal point associated with the channel input value. The
XD_SCALE units code must match the units code of the measurement channel in
the transducer block. If the units do not match, the block will not transition to MAN
or AUTO.
The high and low scale values, engineering units code, and number of digits to the
right of the decimal point associated with OUT when L_TYPE is not direct.
Options for controlling access of host computers and local control panels to
operating, tuning, and alarm parameters of the block. Not used by device.
Allows the selection of input/output options used to alter the PV. Low cutoff enabled
is the only selectable option.
Allows the user to select options for status handling and processing. The options
supported in the AI block are the following:
Propagate fault forward
Uncertain if limited
Bad if limited
Uncertain if Manual mode.
The CHANNEL value is used to select the measurement value. Configure the
CHANNEL parameter before configuring the XD_SCALE parameter. Refer to Table
3-5 on page 3-11.
Linearization type. Determines whether the field value is used directly (Direct), is
converted linearly (Indirect), or is converted with the square root (Indirect Square
Root).
If percentage value of transducer input fails below this, PV = 0.
The time constant of the first-order PV filter. It is the time required for a 63% change
in the PV or OUT value.
The value and status from the transducer block or from the simulated input when
simulation is enabled.
This alert is generated by any change to the static data.
The block alarm is used for all configuration, hardware, connection failure or system
problems in the block. The cause of the alert is entered in the subcode field. The first
alert to become active will set the Active status in the Status parameter. As soon as
the Unreported status is cleared by the alert reporting task, another block alert may
be reported without clearing the Active status, if the subcode has changed.
The summary alarm is used for all process alarms in the block. The cause of the
alert is entered in the subcode field. The first alert to become active will set the
Active status in the Status parameter. As soon as the Unreported status is cleared
by the alert reporting task, another block alert may be reported without clearing the
Active status, if the subcode has changed.
Used to set auto acknowledgment of alarms.
The amount the alarm value must return within the alarm limit before the associated
active alarm condition clears.
The priority of the HI HI alarm.
The setting for the alarm limit used to detect the HI HI alarm condition.
The priority of the HI alarm.
The setting for the alarm limit used to detect the HI alarm condition.
The priority of the LO alarm.
The setting for the alarm limit used to detect the LO alarm condition.
The priority of the LO LO alarm.
The setting for the alarm limit used to detect the LO LO alarm condition.
The HI HI alarm data, which includes a value of the alarm, a timestamp of
occurrence and the state of the alarm.
The HI alarm data, which includes a value of the alarm, a timestamp of occurrence
and the state of the alarm.
The LO alarm data, which includes a value of the alarm, a timestamp of occurrence
and the state of the alarm.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table D-1. Analog Input Function Block Parameters
Number
Parameter
Units
Description
36
LO_LO_ALM
None
37
38
OUT_D
ALM_SEL
None
None
39
40
STDDEV
CAP_STDDEV
% of OUT Range
% of OUT Range
Functionality
The LO LO alarm data, which includes a value of the alarm, a timestamp of
occurrence and the state of the alarm.
Discrete output to indicate a selected alarm condition.
Used to select the process alarm conditions that will cause the OUT_D parameter to
be set.
Standard deviation of the measurement for 100 macrocycles.
Capability standard deviation, the best deviation that can be achieved.
Simulation
To support testing, either change the mode of the block to manual and adjust
the output value, or enable simulation through the configuration tool and
manually enter a value for the measurement value and its status. In
simulation, the ENABLE jumper must be set on the field device.
NOTE
All FOUNDATION fieldbus instruments have a simulation jumper. As a safety
measure, the jumper has to be reset every time there is a power interruption.
This measure is to prevent devices that went through simulation in the staging
process from being installed with simulation enabled.
With simulation enabled, the actual measurement value has no impact on the
OUT value or the status.
Figure D-1. Analog Input
Function Block Timing Diagram
OUT (mode in man)
OUT (mode in auto)
PV
63% of Change
FIELD_VAL
Time (seconds)
PV_FTIME
D-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Figure D-2. Analog Input
Function Block Schematic
Analog
Measurement
ALM_SEL
Access
Analog
Meas.
HI_HI_LIM
HI_LIM
LO_LO_LIM
LO_LIM
CHANNEL
Alarm
Detection
OUT_D
ALARM_HYS
LOW_CUT
OUT
Cutoff
Convert
Filter
PV
Status
Calc.
SIMULATE
L_TYPE
FIELD_VAL
PV_FTIME
IO_OPTS
MODE
STATUS_OPTS
F
OUT_SCALE
XD_SCALE
OUT = Block output value and status
OUT_D = Discrete output that signals a selected alarm condition
Filtering
The filtering feature changes the response time of the device to smooth
variations in output readings caused by rapid changes in input. Adjust the
filter time constant (in seconds) using the PV_FTIME parameter. Set the filter
time constant to zero to disable the filter feature.
Signal Conversion
Set the signal conversion type with the Linearization Type (L_TYPE)
parameter. View the converted signal (in percent of XD_SCALE) through the
FIELD_VAL parameter.
100   Channel Value – EU*@0% 
FIELD_VAL = ------------------------------------------------------------------------------------------- EU*@100% – EU*@0% 
* XD_SCALE values
Choose from direct, indirect, or indirect square root signal conversion with the
L_TYPE parameter.
Direct
Direct signal conversion allows the signal to pass through the accessed
channel input value (or the simulated value when simulation is enabled).
PV = Channel Value
Indirect
Indirect signal conversion converts the signal linearly to the accessed channel
input value (or the simulated value when simulation is enabled) from its
specified range (XD_SCALE) to the range and units of the PV and OUT
parameters (OUT_SCALE).
FIELD_VAL
PV =  -------------------------------   EU**@100% – EU**@0%  + EU**@0%


100
** OUT_SCALE values
D-4
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Indirect Square Root
Indirect Square Root signal conversion takes the square root of the value
computed with the indirect signal conversion and scales it to the range and
units of the PV and OUT parameters.
PV =
 FIELD_VAL
-------------------------------   EU**@100% – EU**@0%  + EU**@0%


100
** OUT_SCALE values
When the converted input value is below the limit specified by the LOW_CUT
parameter, and the Low Cutoff I/O option (IO_OPTS) is enabled (True), a
value of zero is used for the converted value (PV). This option eliminates false
readings when the differential pressure measurement is close to zero and it
may be useful with zero-based measurement devices such as flowmeters.
NOTE
Low Cutoff is the only I/O option supported by the AI block. Set the I/O option
when the block is OOS.
Block Errors
Table D-2 lists conditions reported in the BLOCK_ERR parameter. Conditions
in bold are inactive for the AI block and are given here for reference.
Table D-2. BLOCK_ERR
Conditions
Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Name and Description
Other
Block Configuration Error: the selected channel carries a measurement that is
incompatible with the engineering units selected in XD_SCALE, the L_TYPE
parameter is not configured, or CHANNEL = zero.
Link Configuration Error
Simulate Active: Simulation is enabled and the block is using a simulated value in
its execution.
Local Override
Device Fault State Set
Device Needs Maintenance Soon
Input Failure/Process Variable has Bad Status: The hardware is bad, or a bad
status is being simulated.
Output Failure: The output is bad based primarily upon a bad input.
Memory Failure
Lost Static Data
Lost NV Data
Readback Check Failed
Device Needs Maintenance Now
Power Up
Out of Service: The actual mode is out of service.
D-5
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Modes
The AI Function Block supports three modes of operation as defined by the
MODE_BLK parameter:
Manual (Man)
The value of the block output (OUT) may be set manually
Automatic (Auto)
OUT reflects the analog input measurement or the simulated value when
simulation is enabled.
Out of Service (OOS)
The block is not processed. FIELD_VAL and PV are not updated and the
OUT status is set to Bad: Out of Service. The BLOCK_ERR parameter
shows Out of Service. In this mode, changes can be made to all
configurable parameters.
Alarm Detection
A block alarm will be generated whenever the BLOCK_ERR has an error bit
set. The types of block error for the AI block are defined above.
Process Alarm detection is based on the OUT value. Configure the alarm
limits of the following standard alarms:
•
High (HI_LIM)
•
High high (HI_HI_LIM)
•
Low (LO_LIM)
•
Low low (LO_LO_LIM)
To avoid alarm chatter when the variable is oscillating around the alarm limit,
an alarm hysteresis in percent of the PV span can be set using the
ALARM_HYS parameter. The priority of each alarm is set in the following
parameters:
•
HI_PRI
•
HI_HI_PRI
•
LO_PRI
•
LO_LO_PRI
Table D-3. Alarm Priority Levels
Number
0
1
2
3-7
8-15
D-6
Description
The priority of an alarm condition changes to 0 after the condition that caused the
alarm is corrected.
An alarm condition with a priority of 1 is recognized by the system, but is not
reported to the operator.
An alarm condition with a priority of 2 is reported to the operator, but does not
require operator attention (such as diagnostics and system alerts).
Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Status Handling
Normally, the status of the PV reflects the status of the measurement value,
the operating condition of the I/O card, and any active alarm condition. In Auto
mode, OUT reflects the value and status quality of the PV. In Man mode, the
OUT status constant limit is set to indicate that the value is a constant and the
OUT status is Good.
If the sensor limit exceeds the high or low range, PV status is set high or low
and EU range status is set to uncertain.
In the STATUS_OPTS parameter, select from the following options to control
the status handling:
BAD if Limited
Sets the OUT status quality to Bad when the value is higher or lower than
the sensor limits.
Uncertain if Limited
Sets the OUT status quality to Uncertain when the value is higher or lower
than the sensor limits.
Uncertain if in Manual mode
The status of the Output is set to Uncertain when the mode is set to
Manual
NOTES
1. The instrument must be in OOS mode to set the status option.
2. The AI block only supports the BAD if Limited option, uncertain if limited,
and uncertain if manual.
Advanced Features
The AI function block provided with Rosemount fieldbus devices provides
added capability through the addition of the following parameters:
ALARM_TYPE
Allows one or more of the process alarm conditions detected by the AI
function block to be used in setting its OUT_D parameter.
OUT_D
Discrete output of the AI function block based on the detection of process
alarm condition(s). This parameter may be linked to other function blocks
that require a discrete input based on the detected alarm condition.
STD_DEV and CAP_STDDEV
Diagnostic parameters that can be used to determine the variability of the
process.
D-7
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Application Information
The configuration of the AI function block and its associated output channels
depends on the specific application. A typical configuration for the AI block
involves the following parameters:
CHANNEL
The device supports more than one measurement, so verify that the
selected channel contains the appropriate measurement or derived value.
Refer to Table 3-5 on page 3-11 for a listing of available channels on the
848T.
L_TYPE
Select Direct when the measurement is in the desired engineering units
for the block output. Select Indirect when converting the measured
variable into another, for example, pressure into level or flow into energy.
SCALING
XD_SCALE provides the range and units of the measurement and
OUT_SCALE provides the range and engineering units of the output.
OUT_SCALE is only used when in indirect or indirect square root.
AI Block
Troubleshooting
Symptom
Mode will not leave OOS
Possible Causes
Target mode not set.
Configuration error
Resource block
Schedule
Process and/or block
alarms will not work.
Features
Notification
Status Options
Value of output does not
make sense
Linearization Type
Scaling
Cannot set HI_LIMIT,
HI_HI_LIMIT, LO_LIMIT,
or LO_LO_LIMIT Values
D-8
Scaling
Corrective Action
Set target mode to something other than OOS.
BLOCK_ERR will show the configuration error bit set. The following are parameters that
must be set before the block is allowed out of OOS:
• CHANNEL must be set to a valid value and cannot be left at initial value of 0.
• XD_SCALE.UNITS_INDEX must match the units in the transducer block
channel value. Setting the units in the AI block automatically sets them in the
XD_BLOCK.
• L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be left at
initial value of 0.
The actual mode of the Resource block is OOS. See Resource Block Diagnostics for
corrective action.
Block is not scheduled and therefore cannot execute to go to Target Mode. Typically,
BLOCK_ERR will show “Power-Up” for all blocks that are not scheduled. Schedule the
block to execute.
FEATURES_SEL does not have Alerts enabled. Enable the Alerts bit.
LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY. Alarm not linked to host.
STATUS_OPTS has Propagate Fault Forward bit set. This should be cleared to cause an
alarm to occur.
L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be left at
initial value of 0.
Scaling parameters are set incorrectly:
• XD_SCALE.EU0 and EU100 should match that of the transducer block
channel value.
• OUT_SCALE.EU0 and EU100 are not set properly.
• Both STB on each asic used must by in auto.
Limit values are outside the OUT_SCALE.EU0 and OUT_SCALE.EU100 values.
Change OUT_SCALE or set values within range.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
MULTIPLE ANALOG
INPUT (MAI) FUNCTION
BLOCK
OUT_1
OUT_2
MAI
OUT_3
The Multiple Analog Input (MAI) function block has the ability to process up to
eight field device measurements and make them available to other function
blocks. The output values from the MAI block are in engineering units and
contain a status indicating the quality of the measurement. The measuring
device may have several measurements or derived values available in
different channels. Use the channel numbers to define the variables that the
MAI block processes.
The MAI block supports signal scaling, signal filtering, signal status
calculation, mode control, and simulation. In Automatic mode, the block’s
output parameters (OUT_1 to OUT_8) reflects the process variable (PV)
values and status. In Manual mode, OUT may be set manually. The Manual
mode is reflected on the output status. Table D-4 lists the MAI block
parameters and their units of measure, descriptions, and index numbers. The
block execution time is 30 ms.
OUT_4
OUT_5
OUT_6
OUT_7
OUT_8
Out1 = The block output value and status
for the first channel.
Table D-4. Multiple Analog Input Function Block Parameters
Number
Parameter
Units
Description
1
ST_REV
None
2
3
TAG_DESC
STRATEGY
None
None
4
ALERT_KEY
None
5
MODE_BLK
None
6
BLOCK_ERR
None
7
CHANNEL
None
8, 9, 10, 11,
12, 13, 14,
15
16
17
18
OUT (1, 2, 3, 4, 5,
6, 7, 8)
EU of OUT_SCALE
UPDATE_EVT
BLOCK_ALM
None
None
SIMULATE
None
The revision level of the static data associated with the input selector block. The
revision value will be incremented each time a static parameter value in the block is
changed.
The user description of the intended application of the block.
The strategy field can be used to identify grouping of blocks. This data is not
checked or processed by the block.
The identification number of the plant unit. This information may be used in the host
for sorting alarms, etc.
The actual, target, permitted, and normal modes of the block.
Actual: The mode the “block is currently in”
Target: The mode to “go to”
Permitted: Allowed modes that target may take on
Normal: Most common mode for target
This parameter reflects the error status associated with the hardware or software
components associated with a block. It is a bit string, so that multiple errors may be
shown.
Allows for custom channel setting. Valid values include:
0: Unitialized
1: Channels 1 to 8 (index values 27 to 34 can only be set to their corresponding
channel number, i.e. CHANNEL_X=X)
2: Custom settings (index values 27 to 34 can be configured for any valid channel
as defined by the DD)
The block output value and status
This alert is generated by any change to the static data
The block alarm is used for all configuration, hardware connection feature, or
system problems in the block. The cause of the alert is entered in the subcode field.
The first alert to become active will set the Active status in the Status parameter. As
soon as the Unreported status is cleared by the alert reporting task, another block
may be reported without clearing the Active status, if the subcode has changed.
A group of data that contains the current sensor transducer value and status, and
the enable/disable bit.
D-9
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table D-4. Multiple Analog Input Function Block Parameters
Number
Parameter
Units
Description
19
XD_SCALE
None
20
OUT_SCALE
None
21
GRANT_DENY
None
22
IO_OPTS
None
23
STATUS_OPTS
None
24
L_TYPE
None
25
26
LOW_CUT
PV_FTIME
27, 28, 29,
30, 31, 32,
33, 34
35, 36, 37,
38, 39, 40,
41, 42
43, 44, 45,
46, 47, 48,
49, 50
CHANNEL_(1, 2,
3,4 5, 6, 7, 8)
None
STDDEV_(1, 2, 3,
4, 5, 6, 7, 8)
% of OUT Range
The high and low scale values, engineering units code and number of digits to the
right of the decimal point associated with the channel input value. The XD_SCALE
units code must match the units code of the measurement channel in the
transducer block. If the units do not match, the block will not transition to MAN or
AUTO. It will automatically change units in the STB block to the last one written.
Multiple blocks reading the same channel may conflict (only one unit type per
channel).
The high and low scale values, engineering unit code and number of digits to the
right of the decimal point associated with OUT.
Options for controlling access of host computers and local control panels for
operating, tuning, and alarm parameters of the block. Not used by device.
Allows the selection of input/output options used to alter the PV. Low cutoff enabled
is the only selectable option.
Allows the user to select options for status handling and processing. The options
supported in the MAI block are the following:
• Propagate fault forward
• Uncertain if limited
• Bad if limited
• Uncertain if manual mode
Linearization type. Determines whether the field value is uses directly (Direct), is
converted linearly (Indirect), or is converted with the square root (Indirect Square
Root)
If percentage value of the sensor transducer input falls below this, PV = 0
The time constant of the first-order PV filter. It is the time required for a 63% change
in the IN value.
The CHANNEL (1, 2, 3, 4, 5, 6, 7, 8) value is used to select the measurement
value. See Table D-4 on page D-6 for available channels. Configure the CHANNEL
parameters to custom (2) before configuring the CHANNEL parameters.
Standard deviation of the corresponding measurement.
CAP_STDDEV_(1
, 2, 3, 4, 5, 6, 7, 8)
% of OUT Range
Capability standard deviation, the best deviation that can be achieved.
Functionality
%
Seconds
Simulation
To support testing, either change the mode of the block to manual and adjust
the output value or enable simulation through the configuration tool and
manually enter a value for the measurement value and its status (this single
value will apply to all outputs). In both cases, first set the ENABLE jumper on
the field device.
NOTE
All FOUNDATION fieldbus instruments have a simulation jumper. As a safety
measure, the jumper has to be reset every time there is a power interruption.
This measure is to prevent devices that went through simulation in the staging
process from being installed with simulation enabled.
With simulation enabled, the actual measurement value has no impact on the
OUT value or the status. The OUT values will all have the same value as
determined by the simulate value.
D-10
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Figure D-3. Multiple Analog
Input Function Block Timing
Diagram
OUT (mode in man)
OUT (mode in auto)
PV
63% of Change
FIELD_VAL
Time (seconds)
PV_FTIME
Figure D-4. Multiple Analog
Input Function Block Schematic
XD_SCALE
OUT_1
OUT_2
Mode Logic
Simulate
Ch 1
Ch 2
Ch 3
Ch 4
Ch 5
Ch 6
Ch 7
Ch 8
OUT_SCALE
OUT_3
OUT_4
L_TYPE
& Filter
OUT_5
OUT_6
OUT_7
OUT_8
Filtering
The filtering feature changes the response time of the device to smooth
variations in output readings caused by rapid changes in input. Adjust the
filter time constant (in seconds) using the PV_FTIME parameter (same value
applied to eight channels). Set the filter time constant to zero to disable the
filter feature.
Signal Conversion
Set the signal conversion type with the Linearization Type (L_TYPE)
parameter. Choose from direct, indirect, or indirect square root signal
conversion with the L_TYPE parameter.
Direct
Direct signal conversion allows the signal to pass through the accessed
channel input value (or the simulated value when simulation is enabled).
PV = Channel Value
D-11
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Indirect
Indirect signal conversion converts the signal linearly to the accessed
channel input value (or the simulated value when simulation is enabled)
from its specified range (XD_SCALE) to the range and units of the PV and
OUT parameters (OUT_SCALE).
Channel Value
PV =  ---------------------------------------   EU**@100% – EU**@0%  + EU**@0%


100
** OUT_SCALE values
Indirect Square Root
Indirect Square Root signal conversion takes the square root of the value
computed with the indirect signal conversion and scales it to the range and
units of the PV and OUT parameters.
PV =
Value
 Channel
---------------------------------------   EU**@100% – EU**@0%  + EU**@0%


100
** OUT_SCALE values
When the converted input value is below the limit specified by the LOW_CUT
parameter, and the Low Cutoff I/O option (IO_OPTS) is enabled (True), a
value of zero is used for the converted value (PV). This option is useful to
eliminate false readings when the differential temperature measurement is
close to zero, and it may also be useful with zero-based measurement
devices such as flowmeters.
NOTE
Low Cutoff is the only I/O option supported by the MAI block. Set the I/O
option in Manual or Out of Service mode only.
Block Errors
Table D-5 lists conditions reported in the BLOCK_ERR parameter. Conditions
in bold are inactive for the MAI block and are given for reference.
Table D-5. BLOCK_ERR
Conditions
Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
D-12
Name and Description
Other
Block Configuration Error: the selected channel carries a measurement that is
incompatible with the engineering units selected in XD_SCALE, the L_TYPE
parameter is not configured, or WRITE_CHECK = zero.
Link Configuration Error
Simulate Active: Simulation is enabled and the block is using a simulated value in
its execution.
Local Override
Device Fault State Set
Device Needs Maintenance Soon
Input Failure/Process Variable has Bad Status: The hardware is bad, or a bad
status is being simulated.
Output Failure: The output is bad based primarily upon a bad input.
Memory Failure
Lost Static Data
Lost NV Data
Readback Check Failed
Device Needs Maintenance Now
Power Up
Out of Service: The actual mode is out of service.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Modes
The MAI Function Block supports three modes of operation as defined by the
MODE_BLK parameter:
Manual (Man)
The block output (OUT) may be set manually
Automatic (Auto)
OUT_1 to OUT_8 reflects the analog input measurement or the simulated
value when simulation is enabled.
Out of Service (OOS)
The block is not processed. PV is not updated and the OUT status is set to
Bad: Out of Service. The BLOCK_ERR parameter shows Out of Service.
In this mode, changes can be made to all configurable parameters. The
target mode of a block may be restricted to one or more of the supported
modes.
Status Handling
Normally, the status of the PV reflects the status of the measurement value,
the operating condition of the I/O card, and any active alarm condition. In Auto
mode, OUT reflects the value and status quality of the PV. In Man mode, the
OUT status constant limit is set to indicate that the value is a constant and the
OUT status is Good.
If the sensor limit exceeds the high or low side range, PV status is set high or
low and EU range status is set to uncertain.
In the STATUS_OPTS parameter, select from the following options to control
the status handling:
BAD if Limited
Sets the OUT status quality to Bad when the value is higher or lower than
the sensor limits.
Uncertain if Limited
Sets the OUT status quality to Uncertain when the value is higher or lower
than the sensor limits.
Uncertain if in Manual mode
The status of the Output is set to Uncertain when the mode is set to
Manual
NOTES
1.
The instrument must be OOS to set the status option.
2.
The MAI block only supports the BAD if Limited option.
D-13
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Application Information
The intended use for this type of function block is for applications where the
sensor types and functionality of each channel (i.e. the simulate, scaling,
filtering, alarms type, and options) are the same.
The configuration of the MAI function block and its associated output
channels depends on the specific application. A typical configuration for the
MAI block involves the following parameters:
CHANNEL
If the device supports more than one measurement, verify that the
selected channel contains the appropriate measurement or derived value.
Refer to Table D-4 on page D-6 for a listing of available channels on the
848T.
L_TYPE
Select Direct when the measurement is already in the desired engineering
units for the block output. Select Indirect when converting the measured
variable into another, for example, pressure into level or flow into energy.
Select Indirect Square Root when the block I/O parameter value
represents a flow measurement made using differential pressure, and
when square root extraction is not performed by the transducer.
SCALING
XD_SCALE provides the range and units of the measurement and
OUT_SCALE provides the range and engineering units of the output.
MAI Block
Troubleshooting
Symptom
Mode will not leave OOS
Possible Causes
Target mode not set.
Configuration error
Resource block
Schedule
Process and/or block
alarms will not work.
Features
Notification
Status Options
Value of output does not
make sense
Linearization Type
Scaling
D-14
Corrective Action
Set target mode to something other than OOS.
BLOCK_ERR will show the configuration error bit set. The following are
parameters that must be set before the block is allowed out of OOS:
• Initial value is 1.
• XD_SCALE.UNITS_INDEX must match the units in all the corresponding
sensor transducer blocks.
• L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be
left at initial value of 0.
The actual mode of the Resource block is OOS. See Resource Block Diagnostics
for corrective action.
Block is not scheduled and therefore cannot execute to go to Target Mode.
Typically, BLOCK_ERR will show “Power-Up” for all blocks that are not scheduled.
Schedule the block to execute.
FEATURES_SEL does not have Alerts enabled. Enable the Alerts bit.
LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY.
STATUS_OPTS has Propagate Fault Forward bit set. This should be cleared to
cause an alarm to occur.
L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be left
at initial value of 0.
Scaling parameters are set incorrectly:
• XD_SCALE.EU0 and EU100 should match that of the corresponding sensor
transducer block.
• OUT_SCALE.EU0 and EU100 are not set properly.
• Both STBs in an ASIC must be set to auto. Best in 1, 2, 7, 8, ASICs in Auto for
thermocouples
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
INPUT SELECTOR
FUNCTION BLOCK
IN_1
IN_2
IN_3
IN_4
IN_5
IN_6
IN_7
IN_8
DISABLE_1
DISABLE_2
DISABLE_3
DISABLE_4
DISABLE_5
DISABLE_6
DISABLE_7
DISABLE_8
OP_SELECT
The Input Selector (ISEL) function block can be used to select the first good,
Hot Backup, maximum, minimum, or average of as many as eight input
values and place it at the output. The block supports signal status
propagation. There is process alarm detection in the Input Selector function
block. Table D-6 lists the ISEL block parameters and their descriptions, units
of measure, and index numbers. The block execution time is 30 ms.
OUT
OUT_D
SELECTED
ISEL
IN (1-8) = Input
DISABLE (1-8) = Discrete input used to
disable the associated input channel
SELECTED = The selected
channel number
OUT = The block output and status
OUT_D = Discrete output that signals a
selected alarm condition
Table D-6. Input Selector Function Block Parameters
Number
Parameter
Units
1
ST_REV
None
2
3
TAG_DESC
STRATEGY
None
None
4
ALERT_KEY
None
5
MODE_BLK
None
6
BLOCK_ERR
None
7
8
OUT
OUT_RANGE
OUT_RANGE
EU of OUT
9
GRANT_DENY
None
10
11,1 2, 13,
14, 25, 26,
27, 28
STATUS_OPTS
IN_(1, 2, 3, 4, 5,
6, 7, 8)
None
Determined by
source
Description
The revision level of the static data associated with the input selector block. The
revision value will be incremented each time a static parameter value in the block
is changed.
The user description of the intended application of the block.
The strategy field can be used to identify groupings of blocks. This data is not checked
or processed by the block.
The identification number of the plant unit. This information may be used in the host for
sorting alarms, etc.
The actual, target, permitted, and normal modes of the block.
Actual: The mode the “block is currently in”
Target: The mode to “go to”
Permitted: Allowed modes that target may take on
Normal: Most common mode for target
This parameter reflects the error status associated with the hardware or software
components associated with a block. It is a bit string, so that multiple errors may
be shown.
The primary analog value calculated as a result of executing the function block.
The engineering units code to be used in displaying the OUT parameter and
parameters which have the same scaling as OUT.
Options for controlling access of host computers and local control panels to operating,
tuning, and alarm parameters of the block. Not used by device.
Allows the user to select options for status handling and processing.
A connection input from another block
D-15
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Table D-6. Input Selector Function Block Parameters
Number
Parameter
Units
Description
15, 16, 17,
18, 29, 30,
31, 32
19
DISABLE_(1, 2,
3, 4, 5, 6, 7, 8)
None
A connection from another block that disables the associated input from the selection.
SELECT_TYPE
None
20
21
22
23
24
MIN_GOOD
SELECTED
OP_SELECT
UPDATE_EVT
BLOCK_ALM
None
None
None
None
None
33
AVG_USE
None
34
ALARM_SUM
None
35
36
ACK_OPTION
ALARM_HYS
None
Percent
37
38
39
40
41
42
43
44
45
HI_HI-PRI
HI_HI_LIM
HI_PRI
HI_LIM
LO_PRI
LO_LIM
LO_LO_PRI
LO_LO_LIM
HI_HI_ALM
None
Percent
None
EU of IN
None
EU of IN
None
EU of IN
None
46
HI_ALM
None
47
LO_ALM
None
48
LO_LO_ALM
None
49
50
OUT_D
ALM_SEL
None
None
Specifies input selection method. Methods available include: First Good, Minimum,
Maximum, Middle, Average, or Hot Backup.
The minimum number of good inputs.
The selected input number (1 to 8) or the number of input used for the average output.
Overrides the algorithm to select 1 of the 8 inputs regardless of the selection type.
This alert is generated by any change to the static data
The block alarm is used for all configuration, hardware, connection failure, or system
problems in the block. The cause of the alert is entered in the subcode field. The first
alert to become active will set the Active status in the Status parameter. As soon as the
Unreported status is cleared by the alert reporting task, another block may be reported
without clearing the Active status, if the subcode has changed.
Number of parameters to use in the averaging calculation. For example, if AVG_USE is
4 and the number of connected inputs is 6, then the highest and lowest values would
be dropped prior to calculating the average. If AVG_USE is 2 and the number of
connected inputs is 7, then the two highest and lowest values would be dropped prior
to calculating the average and the average would be based on the middle three inputs.
The current alert status, unacknowledged states, and disabled states of the alarms
associated with the function block.
Used to set automatic acknowledgement of alarms.
The amount the alarm value must return within the alarm limit before the associated
active alarm condition clears
The priority of the HI HI alarm
The setting for the alarm limit used to detect the HI HI alarm condition.
The priority of the HI alarm
The setting for the alarm limit used to detect the HI alarm condition
The priority of the LO alarm
The setting of the alarm limit used to detect the LO alarm condition
The priority of the LO LO alarm
The setting for the alarm limit sued to detect the LO LO alarm condition
The HI HI alarm data, which includes a value of the alarm, a timestamp of occurrence
and the state of the alarm
The HI alarm data, which includes a value of the alarm, a timestamp of occurrence and
the state of the alarm
The LO alarm data, which includes a value of the alarm, a timestamp of occurrence
and the state of the alarm
The LO LO alarm data, which includes a value of the alarm, a timestamp of occurrence
and the state of the alarm
Discrete output to indicate a selected alarm value
Used to select the process alarm conditions that will cause the OUT_D parameter to
be set.
D-16
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Functionality
Figure D-5. Input Selector
Function Block Schematic
IN_n
OUT
Mode Logic
SELECTED
OP_SELECT
OUT_D
SELECT_TYPE
MIN_GOOD
STATUS_OPTS
Selection
Logic
Alarm
DISABLE_n
Block Errors
Table D-7 lists conditions reported in the BLOCK_ERR parameter. Conditions
in bold are inactive for the ISEL block and are given for reference.
Table D-7. BLOCK_ERR
Conditions
Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Name and Description
Other: The output has a quality of uncertain.
Block Configuration Error: Select type is not configured
Link Configuration Error
Simulate Active
Local Override
Device Fault State Set
Device Needs Maintenance Soon
Input Failure/Process Variable has Bad Status: One of the inputs is Bad.
Output Failure
Memory Failure
Lost Static Data
Lost NV Data
Readback Check Failed
Device Needs Maintenance Now
Power Up: The device was just powered-up.
Out of Service: The actual mode is out of service.
D-17
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Modes
The ISEL function block supports three modes of operation as defined by the
MODE_BLK parameter:
Manual (Man)
The block output (OUT) may be set manually.
Automatic (Auto)
OUT reflects the selected value.
Out of Service (OOS)
The block is not processed. The BLOCK_ERR parameter shows Out of
Service. The target mode of a block may be restricted to one or more of
the supported modes. In this mode, changes can be made to all
configurable parameters.
Alarm Detection
A block alarm will be generated whenever the BLOCK_ERR has an error bit
set. The type of block errors for the ISEL block are defined above.
Process Alarm detection is based on the OUT value. The alarm limits of the
following standard alarms can be configured:
•
High (HI_LIM)
•
High high (HI_HI_LIM)
•
Lo (LO_LIM)
•
Lo low (LO_LO_LIM)
In order to avoid alarm chattering when the variable is oscillating around the
alarm limit, an alarm hysteresis in percent of the PV span can be set using the
ALARM_HYS parameter. The priority of each alarm is set in the following
parameters:
•
HI_PRI
•
HI_HI_PRI
•
LO_PRI
•
LO_LO_PRI
Table D-8. Alarm Priority Levels
Number
0
1
2
3-7
8-15
D-18
Description
The priority of an alarm condition changes to 0 after the condition that caused the
alarm is corrected.
An alarm condition with a priority of 1 is recognized by the system, but is not
reported to the operator.
An alarm condition with a priority of 2 is reported to the operator, but does not
require operator attention (such as diagnostics and system alerts).
Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Block Execution
The ISEL function block reads the values and status of up to eight inputs. To
specify which of the six available methods (algorithms) is used to select the
output, configure the selector type parameter (SELECT_TYPE) as follows:
•
Max selects the maximum value of the inputs.
•
Min selects the minimum value of the inputs.
•
Avg calculates the average value of the inputs.
•
Mid calculates the update for eight sensors.
•
1st Good selects the first available good input.
If the DISABLE_N is active, the associated input is not used in the
selection algorithm.
If an input is not connected, it is also not used in the algorithm.
If the OP_SELECT is set to a value between 1 and 8, the selection type logic
is overridden and the output value and status is set to the value and status of
the input selected by OP_SELECT.
SELECTED will have the number of selected input unless the SELECT_TYPE
is mid, in which case it will take the average of the two middle values. Then
SELECTED will be set to “0” if there is an even number of inputs.
Status Handling
In Auto mode, OUT reflects the value and status quality of the selected input.
If the number of inputs with Good status is less than MIN_GOOD, the output
status will be Bad.
In Man mode, the OUT status high and low limits are set to indicate that the
value is a constant and the OUT status is always Good.
In the STATUS_OPTS parameter, select from the following options to control
the status handling:
Use Uncertain as Good
Sets the OUT status quality to Good when the selected input status is
Uncertain.
Uncertain if in Manual mode
The status of the Output is set to Uncertain when the mode is set to
manual.
NOTE
The instrument must be to OOS to set the status option.
Application Information
Use the ISEL function block to:
•
Select the maximum temperature input from eight inputs and send it to
another function block (see Figure D-6)
•
Calculate the average temperature of the eight inputs (see Figure D-7)
•
Use only six of the eight inputs to calculate the average temperature.
D-19
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Figure D-6. Input Selector
Function Block Application
Example (SEL_TYPE = max)
IN2 = 118 °F
Input Selector
(ISEL) Function
Block
IN3 = 104 °F
IN4 = 107 °F
OUT = 140 °F
IN5 = 112 °F
IN6 = 115 °F
IN7 = 130 °F
IN8 = 140 °F
SEL_TYPE = max
IN1 = 126 °F
Figure D-7. Input Selector
Function Block Application
Example (SEL_TYPE =
average) AVG_USE = 6
IN2 = 118 °F
Input Selector
(ISEL) Function
Block
IN3 = 104 °F
IN4 = 107 °F
OUT = 118 °F
IN1 = 126 °F
IN5 = 112 °F
IN6 = 115 °F
IN7 = 130 °F
IN8 = 140 °F
To Another
Function Block
To Another
Function Block
AVG_USE = 6
SEL_TYPE = avg
To determine OUT for a 6-input reading, read all eight, sort in numerical order, drop the
highest and lowest values, and calculate the average.
107
+ 112 + 115 + 118 + 126 + 130- = 118F
------------------------------------------------------------------------------------------6
ISEL Block
Troubleshooting
Symptom
Mode will not leave OOS
Possible Causes
Target mode not set.
Configuration error
Resource block
Schedule
Status of output is BAD
Block alarms will not work.
Inputs
OP selected
Min good
Block is in OOS mode
Features
Notification
Status Options
Cannot set HI_LIMIT,
HI_HI_LIMIT, LO_LIMIT,
LO_LO_LIMIT
D-20
Scaling
Corrective Action
Set target mode to something other than OOS.
BLOCK_ERR will show the configuration error bit set. SELECT_TYPE must be set to
a valid value and cannot be left at 0.
The actual mode of the Resource block is OOS. See Resource Block Diagnostics for
corrective action.
Block is not scheduled and therefore cannot execute to go to Target Mode. Typically,
BLOCK_ERR will show “Power-Up” for all blocks that are not scheduled. Schedule the
block to execute.
All inputs have Bad status
OP_SELECT is not set to 0 (or it is linked to an input that is not 0), and it points to an
input that is Bad.
The number of Good inputs is less than MIN_GOOD.
Change mode to Auto
FEATURES_SEL in the resource block does not have Alerts enabled. Enable the
Alerts bit.
LIM_NOTIFY in the resource block is not high enough. Set equal to MAX_NOTIFY.
STATUS_OPTS has Propagate Fault Forward bit set. This should be cleared to cause
an alarm to occur.
Limit values are outside the OUT_SCALE.EU0 and OUT_SCALE.EU100 values.
Change OUT_SCALE or set values within range.
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Index
Numerics
2-Inch Pipe Stand
Mounting . . . . . . . . . . . . .2-3
A
Alarms
Configuration . . . . . . .
Analog Input
Configuration . . . . . . .
Ground . . . . . . . . . . .
Analog Input Function Block
Advanced Features . .
Alarm Detection . . . . .
Application Information
Block Errors . . . . . . . .
Configuration . . . . . . .
Direct . . . . . . . . . . . .
Filtering . . . . . . . . . . .
Functionality . . . . . . .
Indirect . . . . . . . . . . .
Indirect Square Root . .
Modes . . . . . . . . . . . .
Automatic . . . . . .
Manual . . . . . . . .
Out of Service . . .
Parameters . . . . . . . .
Signal Conversion . . .
Simulation . . . . . . . . .
Status Handling . . . . .
Troubleshooting . . . . .
Wiring Diagram . . . . .
3-6
. . .3-3
. . .3-6
. . .2-9
. . D-1
. . D-7
. . D-6
. . D-8
. . D-5
. . .3-6
. . D-4
. . D-4
. . D-3
. . D-4
. . D-5
. . D-6
. . D-6
. . D-6
. . D-6
. . D-1
. . D-4
. . D-3
. . D-7
. . D-8
. . .2-6
B
Block Operation . . . . . . . . . . C-3
Alerts . . . . . . . . . . . . . . C-3
Instrument Specific Blocks C-3
C
Cable Glands
Installation
Commissioning
Tag . . . . .
Conduit Entries
Configuration . . . . . . . . . . . . . 3-2
Alarms . . . . . . . . . . . . . . 3-3
Analog Transmitters . . . . . 3-6
Analog Input Block . . 3-6
Multiple Analog Input Block
. . . . . . . . . . .2-12
. . . . . . . . . . . .4-2
. . . . . . . . . . . 2-11
. . . . . . . . . . .2-12
Block . . . . . . . . . . . . . .
Custom . . . . . . . . . . . . .
Damping . . . . . . . . . . . .
Differential Sensor Blocks
Methods . . . . . . . . . . . .
Monitoring Applications
Single Selection . . .
Typical . . . . . . . . . .
Reset . . . . . . . . . . . . . .
Restart Processor . .
Restart with Defaults
Resource Block . . . . . . .
Standard . . . . . . . . . . . .
Transmitter . . . . . . . . . .
Connections . . . . . . . . . . . .
Analog Inputs . . . . . . . .
Millivolt Inputs . . . . . . . .
Ohm Inputs . . . . . . . . . .
Power Supply . . . . . . . .
RTD Inputs . . . . . . . . . .
Thermocouple Inputs . . .
. 3-7
. 3-2
. 3-3
. 3-3
. 3-2
. 3-4
. 3-4
. 4-3
. 4-3
. 4-3
. 3-7
. 3-2
. 3-2
. 2-4
. 2-5
. 2-5
. 2-5
. 2-7
. 2-5
. 2-5
D
Damping
Configuration . . . . . . . . . . 3-3
Device Descriptions . . . . . . . .C-3
Differential Sensor Blocks
Configuration . . . . . . . . . . 3-3
Differential Transducer Block
Troubleshooting . . . . . . . . 4-4
DIN Rail
Mounting . . . . . . . . . . . . 2-2
Drawing
Switch Location . . . . . . . 2-10
Drawings
848T Analog Connector . . 2-6
Analog Input Wiring . . . . . 2-6
Block Diagram . . . . . . . . . 4-2
Block Internal Structure . .C-2
Cable Gland Installation . 2-12
Commissioning Tag . . . . 2-11
Conduit Entries Installation 2-12
Installation . . . . . . . . . . B-10
Sensor Wiring . . . . . . . . . 2-4
Transmitter Label . . . . . . . 2-7
Transmitter Wiring . . . . . . 2-4
F
FOUNDATION Fieldbus . . . . . . . 4-1
Addressing . . . . . . . . . . . C-6
Block Operation . . . . . . . C-3
Alerts . . . . . . . . . . . C-3
Instrument- Specific Blocks
C-3
Check . . . . . . . . . . . . . . 4-3
Device Descriptions . . . . . C-3
Function Block Scheduling C-8
Function Blocks . . . . . . . C-1
Link Active Scheduler . . . C-4
Network Communication . C-4
Overview . . . . . . . . . . . . C-1
Scheduled Transfers . . . . C-6
Troubleshooting . . . . . . . 4-4
Unscheduled Transfers . . C-7
Function Blocks . . . . . . . . . . . C-1
Analog Input . . . . . . . . . . D-1
Input Selector Function Block .
D-15
Multiple Analog Input . . . . D-9
Scheduling . . . . . . . . . . . C-8
G
Grounding . . . . . . . . . . . . . . . 2-8
Analog Device . . . . . . . . 2-9
Grounded Thermocouple . 2-9
Shielded Wire . . . . . . . . . 2-8
Transmitter Enclosure . . . 2-9
Ungrounded mV . . . . . . . 2-8
Ungrounded RTD/Ohm . . 2-8
Ungrounded Thermocouple 2-8
H
Hardware
Maintenance . . . . . . . . . .
Communication Check
Power Check . . . . . .
Reset Configuration .
Sensor Check . . . . .
4-3
4-3
4-3
4-3
4-3
I
Input Selector Function Block D-15
Alarm Detection . . . . . . D-18
Application Information . D-19
Block Execution . . . . . . D-19
Errors . . . . . . . . . . . . . D-17
Functionality . . . . . . . . . D-17
Index-1
Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
Modes . . . . . . . . . . . .
Automatic . . . . . . .
Manual . . . . . . . .
Out of Service . . . .
Parameters . . . . . . . . .
Status Handling . . . . . .
Troubleshooting . . . . .
Installation . . . . . . . . . . . . .
Intrinsically Safe . . . . .
Non-Incendive . . . . . . .
Using Cable Glands . . .
Using Conduit Entries .
. D-18
. D-18
. D-18
. D-18
. D-15
. D-19
. D-20
. 2-12
. . B-9
. . B-9
. 2-12
. 2-12
Modes . . . . . . . . . . . . .
Automatic . . . . . . .
Manual . . . . . . . . .
Out of Service . . . .
Parameters . . . . . . . . .
Signal Conversion . . . . .
Direct . . . . . . . . . .
Indirect . . . . . . . . .
Indirect Square Root
Modes . . . . . . . . . .
Simulation . . . . . . . . . .
Status Handling . . . . . .
D-13
D-13
D-13
D-13
. D-9
D-11
D-11
D-12
D-12
D-13
D-10
D-13
J
N
Junction Box
Mounting . . . . . . . . . . . . 2-2
Network Communication . . . .
Addressing . . . . . . . . . . .
Function Block Scheduling
Link Active Scheduler . . .
Scheduled Transfer . . . . .
Unscheduled Transfer . . .
L
Link Active Scheduler . . . . . . . C-4
Backup LAS . . . . . . . . . . C-6
LAS Parameters . . . . . . . C-5
C-4
C-6
C-8
C-4
C-6
C-7
Maintenance
Hardware . . . . . . . . . . . . 4-3
Communication Check 4-3
Power Check . . . . . . 4-3
Reset Configuration . 4-3
Sensor Check . . . . . . 4-3
Measurement Transducer Block
Parameters . . . . . . . . . . 3-17
Monitoring Applications
Common Configurations
Single Selection . . . . 3-4
Typical . . . . . . . . . . . 3-4
Mounting . . . . . . . . . . . . . . . . 2-1
2-Inch Pipe Stand . . . . . . 2-3
DIN Rail Without an Enclosure
2-2
Panel with a Junction Box 2-2
Multiple Analog Input
Configuration . . . . . . . . . 3-6
Multiple Analog Input Block
Troubleshooting . . . . . . D-14
Multiple Analog Input Function Block
D-9
Application Information .
Configuration . . . . . . .
Errors . . . . . . . . . . . . .
Filtering . . . . . . . . . . .
Functionality . . . . . . . .
. D-14
. . 3-6
. D-12
. D-11
. D-10
Overview . . . . . . . . . . . .
FOUNDATION Fieldbus
Manual . . . . . . . . . .
Transmitter . . . . . . . .
...
...
...
...
1-2
C-1
1-2
1-2
P
Performance specifications . . . A-4
Power Supply . . . . . . . . . . . . 2-7
Connections . . . . . . . . . . 2-7
R
Resource Block
Alarm Detection . . . . . . 3-11
Configuration . . . . . . . . . 3-7
Errors . . . . . . . . . . . . . 3-10
Modes . . . . . . . . . . . . . 3-10
Automatic . . . . . . . 3-11
Out of Service (OOS) 3-11
Parameters . . . . . . . . . . 3-7
PlantWeb Alerts
Recommended Actions 3-14
PlantWeb™ Alerts . . . . 3-11
advisory alarms . . . 3-13
failed_alarms . . . . . 3-11
maint_alarms . . . . . 3-12
Troubleshooting . . . . . . . 4-4
. . . . .3-21
. . . . . .4-4
. . . . . .2-4
. . . . . .2-8
. . . . .2-10
. . . . . A-4
. . . . . .2-7
. . . . .2-10
. . . . .2-10
. . . . .2-10
Tagging . . . . . . . . . . . . . . . . 2-11
Commissioning . . . . . . . 2-11
Sensor . . . . . . . . . . . . . 2-11
Transmitter . . . . . . . . . . 2-11
Transducer Block
Alarm Detection . . . . . . .3-17
Channel Definitions . . . .3-15
Errors . . . . . . . . . . . . . .3-16
Modes . . . . . . . . . . . . . .3-16
Automatic . . . . . . . .3-17
Out of Service . . . . .3-17
Status Handling . . . . . . .3-17
Transients . . . . . . . . . . . . . . .2-7
Transmitter
Configuration . . . . . . . . . .3-2
Tag . . . . . . . . . . . . . . . . 2-11
Transmitter Wiring Diagram . . .2-4
Troubleshooting . . . . . . . . . . .4-4
Analog Input Function Block D-8
Differential Transducer Block 4-4
FOUNDATION Fieldbus . . . .4-4
Input Selector Function Block
D-20
Multiple Analog Input Block D-14
Resource Block . . . . . . . .4-4
Sensor Transducer Block .4-4
U
Unscheduled Transfers . . . . . C-7
S
Scheduled Transfers . .
Client . . . . . . . . . .
Publisher . . . . . . .
Report Distribution
Server . . . . . . . . .
Subscriber . . . . . .
Security Switch . . . . . .
Index-2
3-21
Sensor Calibration
Troubleshooting . .
Sensor Wiring Diagram
Shield Wire
Ground . . . . . . . .
Simulate Enable Switch
Specifications
performance . . . .
Surges . . . . . . . . . . .
Switches . . . . . . . . . .
Security . . . . . . . .
Simulate Enable . .
T
O
M
Senor
Connection Check . . . . . .4-3
Sensor
Tag . . . . . . . . . . . . . . . . 2-11
Sensor Transducer Block
Change Sensor Configuration
. . . . . C-6
. . . . . C-6
. . . . . C-6
. . . . . C-6
. . . . . C-6
. . . . . C-6
. . . . 2-10
W
Wiring . . . . . . . . . . . . . . . . . .2-4
Communication Check . . .4-3
Power Check . . . . . . . . . .4-3
Reference Manual
00809-0100-4697, Rev EA
October 2011
Standard Terms and Conditions of Sale can be found at www.rosemount.com/terms_of_sale
The Emerson logo is a trademark and service mark of Emerson Electric Co.
Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
SuperModule and Coplanar are trademarks of Rosemount Inc.
PlantWeb is a mark of one of the Emerson Process Management companies.
HART is a registered trademark of the HART Communications Foundation.
ASP Diagnostics Suite is a trademark of one of the Emerson Process Management companies.
Syltherm and D.C. are registered trademarks of Dow Corning Co.
Neobee M-20 is a registered trademark of Stephan Chemical Co.
The 3-A symbol is a registered trademark of the 3-A Sanitary Standards Symbol Council.
FOUNDATION fieldbus is a registered trademark of the Fieldbus Foundation.
Grafoil is a trademark of Union Carbide Corp.
All other marks are the property of their respective owners.
© 2011 Rosemount, Inc. All rights reserved.
Rosemount Inc.
8200 Market Boulevard
Chanhassen, MN 55317 USA
T (U.S.) 1-800-999-9307
T (International) (952) 906-8888
F (952) 949-7001
www.rosemount.com
00809-0100-4697 Rev EA, 10/11
Rosemount Temperature GmbH Emerson Process Management Asia
Frankenstrasse 21
Pacific Private Limited
63791 Karlstein
1 Pandan Crescent
Germany
Singapore 128461
T 49 (6188) 992 0
T (65) 6777 8211
F 49 (6188) 992 112
F (65) 6777 0947
Enquiries@AP.EmersonProcess.com
Beijing Rosemount Far East
Instrument Co., Limited
No. 6 North Street,
Hepingli, Dong Cheng District
Beijing 100013, China
T (86) (10) 6428 2233
F (86) (10) 6422 8586
Download PDF

advertising