Installation Instructions
FLEX Ex Bus Isolator and Flexbus
Connector
(Cat. No. 1797-BIC, -CEC)
7
5
8
2
A B
Allen-Bradley
QUALITY 1797 - CEC
FLEXBUS
CONNECTOR
A B
QUALIT Y
Allen-Bradley
1 2 3 4
+V -V +V -V
1797 - BIC
FLEXBUS
ISOLATOR
PWR 2
6
1
3
1797-CEC
4
1797-BIC
3
42641
6
7
4
5
8
1
2
3
Use the FLEX Ex TM bus isolator to interconnect standard FLEX I/O TM modules to intrinsically safe FLEX Ex modules in the same I/O group.
Component Identification
Indicators
Label
Module locking tab
Removable power connector
FLEX Ex backplane connector
FLEX Ex backplane connector cover
Master backplane connector
FLEX I/O backplane connector
FLEX Ex is a trademark of Rockwell Automation 1 Publication 1797-5.13 - August 2001
2 FLEX Ex Bus Isolator and Flexbus Connector
Product Features
•
Provides an IS-compatible mechanism to separate two sections of the backplane allowing IS and non-IS field-device wiring to the same I/O group
•
Converts hazardous power to IS-safe power to run one side of the bus receiver/transmitter circuitry and IS-safe FLEX Ex backplane power to slave side modules
•
Module: [EEx ib] IIB/IIC
•
Up to eight FLEX Ex modules may be attached to the slave side
Intermixed Systems
The bus isolator modules, 1797-BIC and -CEC, allow you to configure
FLEX Ex modules and FLEX I/O modules on the DIN rail when attached to the same adapter and grouped together on appropriate sides of the bus isolator module. This highly flexible, cost-effective solution combines intrinsically safe and non-intrinsically safe systems.
Intermixed systems can be configured for use in the:
• safe area much like traditional IS and I/O systems
• hazardous and safe control equipment where the distance of physical separation is short
•
FLEX Ex I/O with communication adapters that are not intrinsically safe
Mixing Systems in the Safe Area any communication adapter supported by
FLEX I/O
Bus Isolator
1797-CEC
1794-CE3
Hazardous Area
Zone 1
FLEX Ex Maximum of 1m
1
FLEX I/O
Nonhazardous Area or
Zone 2
1797-BIC
Field Wiring to
Zone 0
40087
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 3
Mixing Systems in the Hazardous Area
Nonhazardous
Area or
Zone 2 any communication adapter supported by FLEX I/O
1797-CE1S
1
1797-CEC 1797-BIC
Hazardous Area
Zone 1
1794-CE3
FLEX Ex
Max of 1m
Note: A maximum of one 1794-CE1 cable and one
1794-CE3 cable can be attached onto the 1797-BIC module.
Field Wiring to
Zone 0
40088
Use the appropriate connection on the explosion-proof enclosure:
For Metric Threads on the Connector:
Part Number Manufacturer
RS-FEED.M
07-9109-99979XP1
Pepperl+Fuchs
Bartec
For NPT Threads on the Connector:
Part Number Manufacturer
RS-FEED.NPT
07-9199-99979XP1
Pepperl+Fuchs
Bartec
Publication 1797-5.13 - August 2001
4 FLEX Ex Bus Isolator and Flexbus Connector
General Installation
The 1797-CEC and -BIC must not be exposed to the environment.
These modules have a protection factor of IP20. Provide a suitable metal enclosure. If these modules are to be installed into a Zone 2 area, then ensure that this enclosure has a protection class of IP54.
ATTENTION
!
The 1797-BIC cannot be used as an associated apparatus after its FLEX Ex backplane connector has been exposed to non-intrinsically safe signals.
Make certain that you only connect the FLEX Ex backplane connector to other intrinsically safe system modules to maintain the integrity of the intrinsically-safe backplane.
ATTENTION
For proper operation, cycle power to the
1797-BIC at the same time power is cycled to the associated adapter.
!
1794
Adapter
1797
CEC
1797
BIC
1797 I/O 1797 I/O 1797 I/O
& Base & Base & Base
1797 I/O
& Base
24V dc power supply
1797 power supply
42754
Electrostatic Charge
Protect the system against electrostatic charge. Post a sign near this module: Attention! Avoid electrostatic charge.
For your convenience, a sign which can be cut out is included in this installation instruction.
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 5
European Community Directive Compliance
If this product has the CE mark it is approved for installation within the European Community or EEA regions. It has been designed and tested to meet the following directives.
EMC Directive
The 1797-BIC and -CEC are tested to meet the Council Directive 89/
336/EC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:
•
EN50081-2
EMC - Generic Emission Standard, Part 2 - Industrial
Environment
•
EN50082-2
EMC - Generic Immunity Standard, Part 2 - Industrial
Environment
This product is intended for use in an industrial environment.
Ex Directive
The 1797-BIC is tested to meet the Council Directive 94/9 EC (ATEX
95) Equipment and Protective Systems Intended for Use in Potentially
Explosive Atmospheres by applying the following standards:
•
EN50014:1997, Electrical Apparatus for Potentially Explosive
Atmospheres
•
EN50020:1994, Electrical Apparatus for Potentially Explosive
Atmospheres - Intrinsic Safety “i”
•
EN50021:1999, Electrical Apparatus for Potentially Explosive
Atmospheres - Type of Protection “n”
The 1797-CEC is tested to meet the Council Directive 94/9 EC (ATEX
95) Equipment and Protective Systems Intended for Use in Potentially
Explosive Atmospheres by applying the following standards:
•
EN50021:1999, Electrical Apparatus for Potentially Explosive
Atmospheres - Type of Protection “n”
Publication 1797-5.13 - August 2001
6 FLEX Ex Bus Isolator and Flexbus Connector
FM Compliance
If this product has the FM mark, it has been designed, evaluated, tested, and certified to meet the following standards:
•
FM C1. No.3600:1998, Electrical Equipment for Use in
Hazardous (Classified) Locations General Requirements
•
FM C1. No.3610:1999, Intrinsically Safe Apparatus and
Associated Apparatus for Use in Class I, II, III Division 1
Hazardous (Classified) Locations
•
FM C1. No.3615:1989, Explosionproof Electrical Equipment
General Requirements
•
FM C1. No.3810:1989, 1995, Electrical and Electronic Test,
Measuring and Process Control Equipment
•
ANSI/NEMA 250, 1991, Enclosures for Electrical Equipment
Inputs/Outputs
Do not apply any non-instrinsically safe signals to the FLEX Ex backplane connector.
When using as an intrinsically safe electrical apparatus according to
EN50020, the European directives and regulations must be followed.
Customer Connections
1797-CEC flexbus flexbus flexbus
Bus
1797-BIC
IS flexbus
PWR limit
Bus
IS flexbus
FLEX Ex bus
+V
-V standard power source
41693
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 7
1797-CEC Module Installation
The 1797-CEC module mounts on a DIN rail. It connects to an adapter or another FLEX I/O module. Note: If using this module with
FLEX I/O modules, do not mount between FLEX I/O modules. Mount the 1797-CEC module to the right of FLEX I/O modules. To mount this module:
1.
Remove the cover plug (if used) in the male connector of the unit to which you are connecting this module.
2.
Position the module on the 35 x 7.5mm DIN rail A (A-B pt. no.
199-DR1).
3.
Rotate the module onto the DIN rail with the top of the rail hooked under the lip on the rear of the module.
A
1797-CEC
A
42642
Publication 1797-5.13 - August 2001
8 FLEX Ex Bus Isolator and Flexbus Connector
4.
Press down to lock the module on the DIN rail.
41377
If the module does not lock in place, use a screwdriver of similar device to move the locking tab down, press the module flush with the DIN rail and release the locking tab to lock the module in place.
5.
Firmly push the module into the adjacent module/terminal base until the units lock together.
1797-CEC
42643
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 9
6.
To remove the 1797-CEC module, you must work from the right side and remove one module at a time. To disengage a module from its neighbor, place a common flat-bladed screwdriver between the two modules and turn 1/4 turn to separate the modules.
1797-CEC
42644
7.
Then slide the module away from its left neighbor, and release the locking lever to remove the module from the DIN rail.
Publication 1797-5.13 - August 2001
10 FLEX Ex Bus Isolator and Flexbus Connector
1797-BIC Module Installation
The 1797-BIC module mounts on a DIN rail. It connects to a
1797-CEC module.
1.
Remove the cover plug (if used) in the male connector of the unit to which you are connecting this module.
2.
Position the module on the 35 x 7.5mm DIN rail A (A-B pt. no.
199-DR1).
3.
Rotate the module onto the DIN rail with the top of the rail hooked under the lip on the rear of the module.
1797-CEC
1797-BIC
FLEXBUS
ISOLATOR
PWR
1
+V -V
2
3
+V -V
4
4.
Press down to lock the module on the DIN rail.
A
42645
A
1797-CEC
1
+V
-V
2
3
+V
-V
4
1797-BIC
FLEXBUS
ISOLATOR
PWR
42646
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 11
If the module does not lock in place, use a screwdriver of similar device to move the locking tab down, press the module flush with the DIN rail and release the locking tab to lock the module in place.
5.
Firmly push the module into the adjacent module/terminal base until the units interconnect.
1797-CEC
1797-BIC
FLEXBUS
ISOLATOR
PWR
1
+V
-V
2
3
+V -V
4
42647
6.
Install DIN rail locks (supplied with the 1797-BIC module) to meet shock and vibration specifications as listed on page 15.
7.
To remove the 1797-BIC, remove the DIN rail locks and then slide the module away from its left neighbor, and release the locking lever to remove the module from the DIN rail.
ATTENTION
!
Do not remove the 1797-CEC or -BIC under power. Remove these modules under power will break the electrical backplane (flexbus) connections. This can cause personal injury or property damage by:
• sending an erroneous signal to your system’s field devices causing unintended machine motion
• causing an explosion in a hazardous environment
• breaking communication to modules beyond this module
Publication 1797-5.13 - August 2001
12 FLEX Ex Bus Isolator and Flexbus Connector
Wiring
When connecting wiring, torque terminal screws to 7-9 inch-pounds.
ATTENTION
!
A B
QUALIT Y
Allen-Bradley
1797 - BIC
FLEXBUS
ISOLATOR
POWER
ATTENTION
!
1 2 3 4
+V -V +V -V
42648
Make certain that you power this device with normal 24V dc. Do not use an intrinsically safe power supply, such as the 1797-PS2E or -PS2N, to power this module.
1.
Apply +V and -V power (24V dc) to the adapter through a removable terminal block.
+V -V +V -V
+V -V +V -V
Screw terminals and spring terminals are provided.
Publication 1797-5.13 - August 2001
41297
FLEX Ex Bus Isolator and Flexbus Connector 13
2.
Strip the +V and -V wires to a length so no bare conductor shows after inserting the wires into position (+V, -V).
3.
If you are using the spring terminals of the plug, insert a screwdriver into the slot and carefully pry until the spring clamp opens to accept the wire.
4.
Connect either a 1797-TB3 module, a 1794-CE1 or a 1794-CE3 cable onto the FLEX Ex backplane connector of the 1797-BIC module.
ATTENTION
The FLEX Ex backplane connector cover must remain in place until a FLEX Ex terminal base or cable is connected to the 1797-BIC module.
!
Indicators
The 1797-BIC module provides a LED indicating power has been applied to the module.
1797-BIC Mounting Dimensions
2.95
(75)
1
+V
-V
2 3
+V
-V
4
3.7
(94)
1797-BIC
FLEXBUS
ISOLATOR
PWR
3.4
(87)
Inches
(Millimeters)
41413
Repair
The 1797-BIC is not field-repairable. Any attempt to open the module will void its warranty and the IS certification. If repair is necessary, return the module to the manufacturer.
Publication 1797-5.13 - August 2001
14 FLEX Ex Bus Isolator and Flexbus Connector
1797-CEC Mounting Dimensions
2.72
(69)
1797-CEC
3.15
(80)
2.17
(55)
Inches
(Millimeters)
41413
Repair
The 1797-CEC is not field-repairable. Any attempt to open the module will void its warranty. If repair is necessary, return the module to the manufacturer.
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 15
1797-BIC Specifications
I/O Module Capacity
Indicators
Isolation Path
Flexbus to Flexbus
Flexbus Slave Side to Power Supply
Power Consumption
Power Source Failure
Maximum Input
Power Dissipation
Thermal Dissipation
IS Module Type
Conductor Wire Size
Weight
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Non-Operating
Vibration
Output (Intrinsically Safe)
(16 pin male and female flexbus connector)
CENELEC
Output (Intrinsically Safe)
(16 pin male and female flexbus connector)
FM
Agency Certification
CENELEC
FM
8 FLEX Ex modules
Power green
Galvanic to DIN EN50020
Galvanic to DIN EN50020
18V - 32V dc @ 0.15A
U m
= 253V ac
2.1W
7.2 BTU/hr
[EEx ib] IIC
12 gauge (4mm
2
) stranded maximum
3/64in (1.2mm) insulation maximum
Approximately 200g
-20 to 70 o C (-4 to 158 o F)
-40 to 85 o C (-40 to 185 o F)
5 to 95% noncondensing
V i
I t
C a
L a
U o
I o
P
L o
C o o
Tested 30g peak acceleration, 11 (±1)ms pulse width
Tested 30g peak acceleration, 11 (±1)ms pulse width
Tested 5g @ 10-500Hz per IEC 68-2-6
<
<
<
<
<
5.75V dc
400mA
2.05W
100
µ
H
39
µ
F
<
<
<
<
5.75V dc
398.25mA
39.67
µ
F
210
µ
H
II (2)G [EEx ib] IIC
1
Nonincendure, use for Class I, Division 2 Groups A-D or
Class I, Zone 2 Group IIC
Provides intrinsically safe outputs to Class I, Division 1
Groups A-D or Class I, Zone 1 Group IIC
Publication 1797-5.13 - August 2001
16 FLEX Ex Bus Isolator and Flexbus Connector
Certificates
CENELEC
FM
DMT 00 ATEX E056
FM Certificate Number 3010810
Declaration of Conformity
Directive 94/9 EC Zone 2
II 3G EEx nA IIC T4 X
1 A total of eight I/O modules can be attached to a 1794 FLEX I/O adapter. The 1797-CEC and -BIC are not included in this number. In intermixed systems, the number of 1797
FLEX Ex I/O modules (attached onto the 1797-BIC) plus the number of 1794 FLEX I/O modules (connected between the adapter and the 1797-CEC) cannot exceed eight.
1797-CEC Specifications
Indicators
Weight
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Non-Operating
Vibration
Agency Certification
FM
Certificates
FM
Declaration of Conformity
Directive 94/9 EC
Not applicable
Approximately 100g
-20 to 70 o C (-4 to 158 o F)
-40 to 85 o C (-40 to 185 o F)
5 to 95% noncondensing
Tested 30g peak acceleration, 11 (±1)ms pulse width
Tested 30g peak acceleration, 11 (±1)ms pulse width
Tested 5g @ 10-500Hz per IEC 68-2-6
Nonincendure, use for Class I, Division 2 Groups A-D or
Class I, Zone 2 Group IIC
FM Certificate Number 3010810
Zone 2
II 3G EEx nA IIC T4 X
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 17
CENELEC Information
The isolator type 1797-BIC/* is an associated apparatus according to
EN 50020. If the isolator is connected to intrinsically safe circuits the applicable national local construction, installation and operating regulations must be heeded (in Germany DIN EN 50020, DIN VDE
0165).
FM Information
Diagram 1
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 2, Group IIC or
Class I, Division 2, Groups A-D
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 1, Group IIC or
Class I, Division 1, Groups A-D
Diagram 2
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 2, Group IIC or
Class I, Division 2, Groups A-D
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
42876
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 1, Group IIC or
Class I, Division 1, Groups A-D
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
42877
Publication 1797-5.13 - August 2001
18 FLEX Ex Bus Isolator and Flexbus Connector
Isolator
1797-BIC and -CEC
Restriction
Maximum of 8 I/O modules
I/O module capacitance value is cumulative. Ci (total) = Ci (I/O module 1) + Ci (I/O module 2) + ...Ci (I/O module 8). Ci (total) must be less than 65F. The limitation of eight I/O modules per isolator is a functional limitation. Refer to table 2 of the appropriate I/O Modules sections in this document (1797-6.5.6).
Application
The isolator type 1797-BIC/* functions as a galvanic isolation barrier for signals between a non-intrinsic backplane bus and an intrinsic safe backplane bus. The isolator must be installed in a safe or Zone 2 area.
Cover Plug for IS Backplane Bus
The 16-pole male connector for the FLEX Ex IS backplane bus is provided with a cover plug. The cover plug can only be removed when a 1797-TB3 terminal base, a 1794-CE1 or a 1794-CE3 cable is connected. The connection must not be connected to any signals which exceed the instrinsically safe values of the IS backplane.
Power Supply
The isolator is powered via a removable terminal connector with a dc-voltage between 18V and 32V. Due to a failure in the power supply a maximum voltage U m
of 253V ac is permitted.
Repair
The isolator is not field repairable. Any attempt to open this device will void the warranty and IS certification. If repair is necessary, return this device to the factory.
Publication 1797-5.13 - August 2001
FLEX Ex Bus Isolator and Flexbus Connector 19
IMPORTANT
For detailed certification information, refer to the
FLEX Ex System Certification Reference Manual, publication 1797-6.5.6.
Attention: Avoid electrostatic charge.
ControlNet is a trademark of ControlNet International.
ControlNet Ex is a trademark of Rockwell Automation.
Publication 1797-5.13 - August 2001
Notes:
Publication 1797-5.13 - August 2001
Supersedes Publication 1797-5.13 - February 2001
PN 957555-70
© 2001 Rockwell International Corporation. Printed in USA
