Omega | OM-NET-TC | Owner Manual | Omega OM-NET-TC Owner Manual

Omega OM-NET-TC Owner Manual
Table of Contents
Preface
About this User's Guide ....................................................................................................................... 5
What you will learn from this user's guide ......................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Introducing the OM-NET-TC ................................................................................................................. 6
Ethernet interface ................................................................................................................................................ 6
Functional block diagram ................................................................................................................................... 6
Chapter 2
Installing the OM-NET-TC ..................................................................................................................... 7
Unpacking........................................................................................................................................................... 7
Installing the software ........................................................................................................................................ 7
Connecting the external power adapter .............................................................................................................. 7
Installing the hardware ....................................................................................................................................... 7
Configuring network settings ............................................................................................................................. 8
Address mode settings ...................................................................................................................................................... 8
IP address settings............................................................................................................................................................. 8
Connection code ............................................................................................................................................................... 8
Configuring the network router for communication across networks ................................................................ 8
Calibrating the hardware..................................................................................................................................... 9
Factory calibration ............................................................................................................................................................ 9
Field calibration ................................................................................................................................................................ 9
Restoring factory default network settings ......................................................................................................... 9
Chapter 3
Functional Details ............................................................................................................................... 10
External components ........................................................................................................................................ 10
Screw terminals................................................................................................................................................................10
LED status indicators .......................................................................................................................................................11
RESET button ..................................................................................................................................................................11
Ethernet connector ...........................................................................................................................................................11
External power connector ................................................................................................................................................11
Signal connections ............................................................................................................................................ 11
TC input ...........................................................................................................................................................................11
Digital I/O ........................................................................................................................................................................12
Counter input ...................................................................................................................................................................15
Power output ....................................................................................................................................................................15
Ground .............................................................................................................................................................................15
Mechanical drawings ........................................................................................................................................ 16
DIN-rail compatible .........................................................................................................................................................18
Chapter 4
Specifications ...................................................................................................................................... 19
Thermocouple input .......................................................................................................................................... 19
Channel configurations ..................................................................................................................................... 20
Compatible thermocouples ............................................................................................................................... 20
Accuracy ........................................................................................................................................................... 20
Thermocouple measurement accuracy .............................................................................................................................20
Digital input/output........................................................................................................................................... 21
Temperature alarms .......................................................................................................................................... 22
3
OM-NET-TC User's Guide
Counter ............................................................................................................................................................. 22
Memory ............................................................................................................................................................ 22
Power ................................................................................................................................................................ 23
Network ............................................................................................................................................................ 23
Ethernet connection .........................................................................................................................................................23
Network interface ............................................................................................................................................................23
Network factory default settings ......................................................................................................................................23
Network security ..............................................................................................................................................................24
LED displays and the factory reset button ........................................................................................................ 24
Environment ..................................................................................................................................................... 24
Mechanical ....................................................................................................................................................... 24
Screw terminal connector ................................................................................................................................. 25
4
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Omega Engineering, Inc. OM-NET-TC data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Additional information about OM-NET-TC hardware is available on our website at www.omega.com. You can
also contact Omega Engineering, Inc. by phone, fax, or email with specific questions.



Phone: (203) 359-1660
Fax: (203) 359-7700
Email: das@omega.com
5
Chapter 1
Introducing the OM-NET-TC
The OM-NET-TC is an Ethernet-based thermocouple (TC) data acquisition device that provides the following
features:










Eight 24-bit differential TC inputs
TC channels field-to-host isolation
4 S/s per channel update rate
Type J, K, R, S, T, N, E, and B thermocouples supported, software-selectable per channel
Two integrated cold junction compensation (CJC) sensors; one per four TC inputs
Open thermocouple detection (OTD)
Eight individually-configurable digital I/O channels, isolated from TC channels
±24 mA drive capability
10/100 Ethernet interface
+5 V external power adapter (OM-NET-PS) included
Ethernet interface
The OM-NET-TC has a built-in 10/100 BASE-T auto-negotiation, high-speed communication port. You can
remotely access and configure your OM-NET-TC from anywhere on the network. Only one computer can
control the OM-NET-TC at one time. The networking protocols are TCP and UDP.
A unique media access control (MAC) address is assigned to each device at the factory. You configure the
Ethernet connection settings through software. The network name uses the format E-TC-xxxxxx, where
xxxxxx are the lower six digits of the factory-assigned MAC address.
Functional block diagram
Device functions are illustrated in the block diagram shown here:
Figure 1. Functional block diagram
6
Chapter 2
Installing the OM-NET-TC
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the board from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.
Installing the software
Refer to the Software User's Guide for instructions on installing the software on the CD. This booklet is
available in PDF at www.omega.com/manuals/manualpdf/M4803.pdf.
Install the software before you install your device
The driver needed to run the OM-NET-TC is installed with the software. Therefore, you need to install the
software package you plan to use before you install the hardware.
Connecting the external power adapter
Power to the OM-NET-TC is provided with the 5 volt, 1 amp external power adapter (OM-NET-PS). Connect
the adapter cord to the power connector on the OM-NET-TC, and plug the AC adapter into an electrical outlet.
The Power LED turns on when 5 V power is supplied to the OM-NET-TC. If the voltage supply is less than
4.2 V or more than 5.6 V, the POWER LED does not turn on.
Refer to Figure 3 on page 11 for the location of the Power LED.
Installing the hardware
The OM-NET-TC requires a TCP/IP and UDP connection to a network or computer. Use the standard Ethernet
cable provided to connect the OM-NET-TC to a 10Base-T or 100Base-TX compatible Ethernet port, hub, or
switch.
When connecting the OM-NET-TC for the first time, make sure that you connect to a local network with DHCP
enabled.
If you are unsure whether you have access to a local network or that DHCP is enabled on that network, you
should use a direct connection to a Windows PC.
It may take a minute or two to detect the device and assign the address. The green Link/activity LED on the
lower left of the Ethernet connector turns on when there is a valid Ethernet link, and blinks when network
activity is detected.
Once the OM-NET-TC is physically connected to the local network or PC, you can run the software such as
InstaCal to establish a connection. If a connection cannot be established, verify that the device is using the
default configuration by following the instructions in the Restoring factory default network settings on page 9.
Once a connection is established and you can communicate to the device, you can change the configuration for
other network scenarios.
7
OM-NET-TC User's Guide
Installing the OM-NET-TC
Configuring network settings
The following OM-NET-TC network settings are software-selectable. Only one user at a time can connect to
the OM-NET-TC to configure network options on the device. For typical local networks, the default settings are
recommended.
Address mode settings
The address mode setting determines whether the default IP parameters (IPv4 address, subnet mask, and
gateway) are assigned to the OM-NET-TC or an auto-addressing method is used to assign these parameters.
DHCP or link-local enabled (default)
If connected to a network with a DHCP server, the service automatically assigns an IP address to the device. If
the connected network does not have a DHCP server, the address stored in the default IP address is assigned.
If the OM-NET-TC is directly connected to a Windows PC or other host that supports link-local addressing, a
link-local address is assigned to the device. A link-local address is valid only for communications between the
OM-NET-TC and the device to which it is connected
DHCP Only
Enables configuration by a DHCP server, if one is available. The OM-NET-TC is assigned an IP address shortly
after it is powered up and attached to the network.
Link Local Only
The OM-NET-TC is assigned a link-local IP address by the Windows PC or other host that supports link-local
addressing. A link-local address is valid only for communications between the OM-NET-TC and the device to
which it is connected.
Static
The default IPv4 Address is manually configured on the OM-NET-TC.
IP address settings
The default settings of the following IP address are assigned to the OM-NET-TC when automatic addressing is
disabled or not available (DHCP or Link Local for example)



IPv4 address – The IP address that is stored on the device. The default IPv4 address is 192.168.0.101.
Subnet mask – The Subnet mask that is stored on the OM-NET-TC . The subnet mask determines the
number of bits of the IP address that is used for the host portion of the address vs. the number of bits used
for the network portion. The default subnet mask is 255.255.255.000
Gateway – The gateway IP address that is stored on the OM-NET-TC. The gateway address of the device
that bridges subnets within a network. The default gateway is 192.168.0.1
Connection code
The connection code is a number between 0 (default) and 999999999. You can change this number from its
default of 0 to prevent other users from connecting to and configuring the device. The device remains visible to
other users on the network, but connection by another user is not allowed.
Configuring the network router for communication across networks
In order to communicate with the OM-NET-TC from a computer connected to a different network – such as
over the Internet – you must change the network configuration of the network router.
In the following procedure, the OM-NET-TC is installed on the host LAN, the computer is installed on the
client LAN, and it is assumed that you have you have successfully connected the device to a local network.
Caution! This procedure should only be performed by a network administrator or computer professional.
Incorrect settings can significantly disrupt a network.
8
OM-NET-TC User's Guide
Installing the OM-NET-TC
1.
Determine the IP address of the device. If the address was assigned by DHCP, it is recommended you
change it to a static address by setting the default address to the address assigned and setting the device
network configuration to static.
2.
Configure the firewall/router to forward incoming traffic to the following ports to the IP address assigned
to the device:
o
o
3.
UDP:54211 (discovery)
TCP:54211 (commands)
On the computer connected to the client LAN, manually enter the WAN address of the host router, and
specify the ports that were forwarded to connect to the remote OM-NET-TC.
Calibrating the hardware
Factory calibration
Omega Engineering, Inc. performs the initial factory calibration. Contact Omega Engineering, Inc. for details
about how to return your device and have it calibrated to the factory specifications. The recommended
calibration interval is one year.
Field calibration
The OM-NET-TC also supports field calibration. as an alternative to returning the device for factory calibration.
The same recommended one-year calibration interval applies.
The following items are required to perform field calibration on an OM-NET-TC:


a precision voltage source
a voltmeter
Each ADC (two ADCs per device) is measured at seven points and a linear correction is calculated.
When prompted, enter the voltmeter reading to a precision of six decimal places.
Omega Engineering strongly recommends that you warm up the OM-NET-TC for at least 20 minutes prior to
performing field calibration.
Restoring factory default network settings
To reset the network configuration settings to the factory default values, complete the following steps:
1.
Press and hold in the Reset button for at least four seconds until both the Power and Activity LEDs blink
twice and then turn off, indicating that network settings have been restored to default values.
2.
Release the button so the device continues startup with the default settings.
If the button is released before the two LEDs blink, the settings are not affected and the device starts up
normally.
Holding in the Reset button too long may cause the device to enter bootloader mode
Holding the Reset button in after the Power and Activity LEDs blink may cause the device to enter firmware
update (bootloader) mode. In this mode both LEDs continuously blink. If this occurs, cycle the power to return
the device to normal operation.
If InstaCal is open when default settings are restored, click the Refresh Boards button on the InstaCal toolbar
to reflect the changes.
9
Chapter 3
Functional Details
External components
The OM-NET-TC has the following external components:




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Screw terminals
LED status indicators
Ethernet connector
External power connector
Factory reset button
Screw terminals
The OM-NET-TC screw terminals provide the following connections:
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
Eight differential (CH0H/CH0L to CH7H/CH7L) thermocouple inputs
Eight digital I/O lines (DIO0 to DIO7)
One counter input (CTR)
One voltage output (+VO)
Five digital grounds (GND) and one chassis ground (CHGND)
Signal locations are shown in Figure 2.
Figure 2. OM-NET-TC pinout
10
OM-NET-TC User's Guide
Functional Details
The remaining components are on the top edge of the enclosure; refer to Figure 3:
1
2
3
External power connector
Ethernet connector with green Link/activity LED
(left) and yellow Speed LED (right)
Power LED (top)
4
5
Activity LED (bottom)
Factory reset button
Figure 3. OM-NET-TC connectors, reset button, and status LEDs
LED status indicators
The OM-NET-TC has two LED indicators that indicate the status of power and host communications:


The Power LED is on when external power between 4.2 V to 5.6 V is supplied.
This LED is off when the external power supply is not connected, or the input power is outside of the 4.2 V
to 5.6 V voltage range of the external supply, causing a power fault.
The OM-NET-TC has an onboard voltage supervisory circuit that monitors the 5 V external power supply.
The Activity LED is on when a valid host connection is detected.
This LED blinks when a command is received.
Both Power and Activity LEDs blink once when factory default settings are restored. Refer to Restoring factory
default network settings on page 9 for more information.
RESET button
Press and hold this button to restore the OM-NET-TC to its factory default network settings. Both Power and
Activity LEDs blink once when factory default settings are restored. Refer to Restoring factory default network
settings on page 9 for more information.
Ethernet connector
The OM-NET-TC has one 10/100 BASE-T, auto-negotiation, high-speed communication port. The port
connector is an RJ-45, eight-position connector. The Ethernet port accepts CAT-5 shielded or unshielded
twisted pair cable. The maximum communication distance without using a repeater is 100 meters.
External power connector
Connect the OM-NET-PS power supply to this connector. The power supply provides 5 VDC, 1 A power to the
OM-NET-TC.
Signal connections
TC input
A thermocouple consists of two dissimilar metals that are joined together at one end. When the junction of the
metals is heated or cooled, a voltage is produced that correlates to temperature.
The OM-NET-TC supports type J, K, S, R, B, E, T, N thermocouples.
When TCs are attached to conductive surfaces, the voltage differential between multiple TCs must remain
within ±1.8 V. For best results, use electrically insulated TCs when connected to electrically charged surfaces if
possible.
11
OM-NET-TC User's Guide
Functional Details
Caution! We strongly recommend that you ground yourself using a wrist strap before handling the
thermocouple sensors.
Hardware compatibility
The OM-NET-TC is functionally equivalent to the OM-USB-TC. Universal library programs written for the
OM-USB-TC can be run with the OM-NET-TC.
Cold junction compensation (CJC)
Each group of four TC inputs has a high-resolution CJC sensor. When you connect the thermocouple sensor
leads to the sensor input channel, the dissimilar metals at the OM-NET-TC terminal blocks produce an
additional thermocouple junction. This junction creates a small voltage error component which must be
removed from the overall sensor measurement using a CJC technique.
The measured voltage includes both the thermocouple voltage and the cold junction voltage. To compensate for
the additional cold junction voltage, the OM-NET-TC subtracts the cold junction voltage from the
thermocouple voltage.
Increasing the thermocouple length
If you need to increase the length of your thermocouple, use the same type of TC wires to minimize the error
introduced by thermal EMFs.
Data linearization
After the CJC correction is performed on the measurement data, an on-board microcontroller automatically
linearizes the thermocouple measurement data using National Institute of Standards and Technology (NIST)
linearization coefficients for the selected thermocouple type.
The measurement data is then output as a 32-bit floating point value in the configured format (voltage or
temperature).
Open-thermocouple detection (OTD)
The OM-NET-TC is equipped with OTD for all TC input channels. Any open-circuit condition at the TC sensor
is detected by the software. An open channel is detected by the use of a pull-up and pull-down resistors on the
thermocouple inputs. An open thermocouple condition forces the input differential voltage outside of the valid
thermocouple voltage range. The software recognizes this as an invalid reading, and flags the appropriate
channel. The software continues to sample all channels when OTD is detected.
Input leakage current
With OTD enabled, 65 nA (typical) of input leakage current is injected into the TC. This current can cause an
error voltage to develop across the lead resistance of the TC that is indistinguishable from the thermocouple
voltage you are measuring. You can estimate this error voltage with the following formula:
error voltage = resistance of the thermocouple × 65 nA
To reduce the error, reduce the length of the TC to lower its resistance, or lower the AWG of the wire by using
a wire with a larger diameter. With open-thermocouple detection disabled, 1 nA (typical) of input leakage
current is injected into the TC.
Digital I/O
The OM-NET-TC has eight digital I/O channels that are electrically isolated from the analog circuits. Each bit
is individually configurable for input or output. The digital I/O transfer rate is 5 kHz maximum for softwarepaced operation on a local network.
When you configure the digital bits for input, you can use the OM-NET-TC digital I/O terminals to detect the
state of any TTL-level input. Refer to the schematic shown in Figure 4. If you set the switch to the +5V input,
DIO0 reads TRUE (1). If you move the switch to GND, DIO0 reads FALSE (0).
12
OM-NET-TC User's Guide
Functional Details
Figure 4. Schematic showing switch detection by digital channel DIO0
Pull-up/down configuration
All DIO channels are pulled high by default to 5 V through 47 kΩ resistors with jumper W1 on the circuit board
(see Figure 5). Each jumper configures a digital port for pull-up or pull-down.
Figure 5. Pull-up/down jumper locations
Figure 6 below shows the jumper configured for pull-up and pull-down.
Caution! The discharge of static electricity can damage some electronic components. Take care when
removing the enclosure. Before touching the board, ground yourself using a wrist strap or touch
the computer chassis or other grounded object to eliminate any stored static charge.
Figure 6. Pull-up/down jumper configurations, typical
More information about digital signal connections
For general information about digital signal connections and digital I/O techniques, refer to the
OMB-DAQ-2400, OMB-DAQ-RACK, OM-NET, OM-USB, OM-WEB, and OM-WLS Series General Guide to
Signal Connections (available on our website at www.omega.com/manuals/manualpdf/M4830.pdf).
13
OM-NET-TC User's Guide
Functional Details
When configured for input, input voltage ranges of 0 V to 5 V are permitted, with thresholds of 0.8 V (low) and
2.0 V (high). A typical digital input connection is shown in Figure 7.
Figure 7. Digital input connection example
Temperature alarms
Optionally, you can configure each digital output as an alarm for each TC input. When an alarm is enabled, its
associated output line is driven to the appropriate state determined by the alarm options and input temperature.
You can also use the alarm outputs to control a device or application that indicates when a temperature
threshold has been exceeded. Alarms can also indicate an OTC condition.
A digital output bit can be used to control a logic device needing up to 5 V @ 24 mA. If the device requires a
higher voltage/current, use an OM-NET-TC-controlled MOSFET 1 (user-provided) to control higher voltages
and currents.
Figure 8 shows a relay requiring 24 VDC @ 100 mA controlled by an OM-NET-TC digital output/alarm.
The MOSFET in this example is a relay and is rated for 14 amps and 50 volts DC.
Figure 8. Example of a digital output/alarm controlling a relay
The alarm configurations are stored in non-volatile memory and loaded at power up. Temperatures are
constantly converted on enabled channels and processed for alarm conditions regardless of the communications
connectivity.
1
Metal-oxide semiconductor, field-effect transistor that uses an induced electrical field to control current through the device.
Either negative or positive gate voltages can be applied to control the current.
14
OM-NET-TC User's Guide
Functional Details
The following table describes the OM-NET-TC alarm modes and settings.
Alarm input modes
Set independent temperature
thresholds T1 and T2 for each alarm.

Alarm error modes





Alarm output modes



Alarm when input temperature ≥ T1; reset alarm when input temperature < T2
Alarm when input temperature ≤ T1; reset alarm when input temperature >T2
Alarm when input temperature is < T1 or > T2
Alarm on temperature reading only
Alarm on temperature reading or open thermocouple error
Alarm on open thermocouple error only
Disabled, digital I/O line may be used for normal operation
Enabled, active high output – DIO line goes high when alarm condition is met
Enabled, active low output – DIO line goes low when alarm condition is met
Counter input
The CTR terminal is a 32-bit event counter that can accept frequency inputs up to 10 MHz. The internal counter
increments when the TTL levels transition from low to high.
Power output
The +VO terminal can output up to 10 mA maximum. You can use this terminal to supply power to external
devices or circuitry.
Caution! The +VO terminal is an output. Do not connect it to an external power supply or you may damage
the device and possibly the computer.
Ground
The digital ground (GND) terminals provide a common ground – isolated from TC inputs – for the digital and
counter channels and the +VO terminal.
The chassis ground (CHGND) terminal provides a connection point for chassis ground. Connect this to an
external grounding source.
15
OM-NET-TC User's Guide
Functional Details
Mechanical drawings
Figure 9. OM-NET-TC device circuit board dimensions
16
OM-NET-TC User's Guide
Functional Details
Figure 10. OM-NET-TC bottom enclosure dimensions
17
OM-NET-TC User's Guide
Functional Details
Figure 11. OM-NET-TC top enclosure dimensions
DIN-rail compatible
The OM-NET-TC can be mounted on a DIN rail using the OM-NET-DINRAILKIT accessory kit. Refer to our
website for more information.
18
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Thermocouple input
Table 1. Thermocouple input specifications
Parameter
Condition
A/D converters
ADC resolution
Number of channels
Input isolation
Channel configuration
Differential input voltage range
(Note 1)
Absolute maximum input
voltage
Differential input impedance
Input current
Common mode rejection
Noise rejection
Input bandwidth
Crosstalk
Sample rate (Note 2)
Input noise
Gain error
Offset error
Measurement sensitivity
(Note 3)
Delta-Sigma
24 bits
8
Between any TCx channel and
digital/chassis ground.
Calibration method
Recommended warm-up time
Calibration interval
500 VDC absolute max
Software-selectable to match sensor type
±0.128 V
Between any two TCx inputs
Open thermocouple detect
disabled
Open thermocouple detect
enabled
fIN = 50 Hz or 60 Hz
fIN = 50 Hz or 60 Hz
Between any two TCx inputs
Thermocouple type J,K,T,E,N
Thermocouple type R,S
Thermocouple type B
Warm-up time
Open thermocouple detect
response time
CJC sensor accuracy
Specification
±25 V (power on)
±25 V (power off)
40 MΩ
1 nA
65 nA
100 dB
75 dB
10 Hz
–90 dB
4 Hz max (per channel)
250 nV rms
0.006 %
3 µV
0.09 °C
0.11 °C
0.13 °C
20 minutes min
1 second
0 °C to 45 °C
±0.20 °C typ
±0.40 °C max
Factory
20 minutes min
1 year (factory calibration)
Note 1:
Note 2:
Calibration is performed at ±70 mV.
The enabled thermocouple inputs are continuously converted at the maximum A/D converter rate. If channels
are enabled and have an open thermocouple connection the sampling rate will be lower.
Note 3:
Measurement sensitivity is the smallest change in temperature that can be detected.
OM-NET-TC User's Guide
Specifications
Channel configurations
Table 2. Channel configuration specifications
Sensor Category
Condition
Specification
Thermocouple
J, K, S, R, B, E, T, or N
The factory default configuration is
Type J.
8 differential channels (Note 4)
Note 4:
Channel configuration is stored on EEPROM external to the isolated microcontroller by the firmware whenever
any item is modified. Modification is performed by commands issued over Ethernet from an external
application, and the configuration is made non-volatile through the use of the EEPROM.
Compatible thermocouples
Table 3. Compatible sensor type specifications
Parameter
Specification
Thermocouple
J: –210 °C to 1200 °C
K: –270 °C to 1372 °C
R: –50 °C to 1768 °C
S: –50 °C to 1768 °C
T: –270 °C to 400 °C
N: –270 °C to 1300 °C
E: –270 °C to 1000 °C
B: 0 °C to 1820 °C
Accuracy
Thermocouple measurement accuracy
Table 4. Thermocouple accuracy specifications, including CJC measurement error (Note 5, Note 6)
All specifications are (±).
Sensor
Type
J
K
S
R
B
E
Sensor
Temperature (°C)
Accuracy Error
Maximum (°C),
15 °C to 35 °C
Accuracy Error
Typical (°C),
15 °C to 35 °C
Accuracy Error
Maximum (°C),
0 °C to 45 °C
Accuracy Error
Typical (°C),
0 °C to 45 °C
–210
0
1200
–210
0
1372
–50
250
1768
–50
250
1768
250
700
1820
–200
0
1000
1.896
0.760
0.717
2.196
0.787
0.974
2.144
1.595
0.750
2.266
1.617
0.631
1.934
0.740
0.482
1.700
0.752
0.629
0.823
0.328
0.324
0.938
0.334
0.431
0.711
0.528
0.178
0.749
0.534
0.148
0.453
0.179
0.137
0.742
0.327
0.285
2.228
0.815
1.336
2.578
0.848
1.807
2.566
1.888
1.759
2.715
1.917
1.579
2.552
1.128
1.213
1.987
0.806
1.142
0.990
0.364
0.585
1.141
0.377
0.786
1.053
0.775
0.649
1.113
0.786
0.584
0.977
0.439
0.492
0.884
0.360
0.500
20
OM-NET-TC User's Guide
Sensor
Type
T
N
Note 5:
Note 6:
Specifications
Sensor
Temperature (°C)
Accuracy Error
Maximum (°C),
15 °C to 35 °C
Accuracy Error
Typical (°C),
15 °C to 35 °C
Accuracy Error
Maximum (°C),
0 °C to 45 °C
Accuracy Error
Typical (°C),
0 °C to 45 °C
–200
0
400
–200
0
1300
1.920
0.801
0.519
2.125
0.857
0.668
0.817
0.339
0.223
0.876
0.351
0.291
2.253
0.870
0.702
2.518
0.940
1.352
0.993
0.385
0.308
1.101
0.412
0.585
Thermocouple measurement accuracy specifications include polynomial linearization, cold-junction
compensation, and system noise. The accuracy specifications assume the device is operated within its enclosure
and has been warmed up for the recommended 20 minutes. Errors shown do not include inherent thermocouple
error. Contact your thermocouple supplier for details on the actual thermocouple accuracy error.
When thermocouples are attached to conductive surfaces, the voltage differential between multiple
thermocouples must remain within ±1.8 V. For best results we recommend using electrically insulated
thermocouples when possible.
Digital input/output
Table 5. Digital input/output specifications
Parameter
Specification
Digital type
Number of I/O
Configuration
Power on conditions
Pull-up/pull-down
configuration
Digital I/O transfer rate
(system paced)
Power on and reset state
Input high voltage threshold
Input high voltage limit
Input low voltage threshold
5 V TTL input / CMOS output
One port of 8 bits, shared with temperature alarms
Each bit can be independently configured for input or output
Power on reset is input mode, except when bits are configured to operate as alarms.
The port has 47 kΩ resistors configurable as pull-up (default) or pull-down via internal
jumper W1.
Input low voltage limit
Output high voltage
Output low voltage
Note 7:
100 to 5000 reads / writes per second, typical, on a local network (Note 7)
All bits are input unless the temperature alarm functionality is enabled for them.
2.0 V min
5.5 V absolute max
0.8 V max
–0.5 V absolute min
0 V recommended min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
This is the typical throughput when the device and host are both connected by Ethernet to the same local
network. Throughput can vary significantly, and typical throughput is not guaranteed, if a wireless connection is
involved or data is sent over the internet.
21
OM-NET-TC User's Guide
Specifications
Temperature alarms
Table 6. Temperature alarm specifications
Parameter
Specification
Number of alarms
8 (one per digital I/O line)
Each alarm controls its associated digital I/O line as an alarm output. When an alarm is
enabled, its associated I/O line is set to output and driven to the appropriate state
determined by the alarm options and input temperature. The alarm configurations are
stored in non-volatile memory and loaded at power on.
 Alarm when input temperature ≥ T1, reset alarm when input temperature < T2
 Alarm when input temperature ≤ T1, reset alarm when input temperature >T2
 Alarm when input temperature is < T1 or > T2
T1 and T2 may be independently set for each alarm.
 Alarm on temperature reading only
 Alarm on temperature reading or open thermocouple error
 Alarm on open thermocouple error only
 Disabled, digital I/O line may be used for normal operation
 Enabled, active high output (DIO line goes high when alarm condition is met)
 Enabled, active low output (DIO line goes low when alarm condition is met)
1 second
Alarm functionality
Alarm input modes
Alarm error modes
Alarm output modes
Alarm latency (Note 8)
Note 8:
Alarm settings are applied when changed and at power-on. Temperatures are constantly converted on enabled
channels and processed for alarm conditions regardless of the communications connectivity.
Counter
Table 7. Counter specifications
Parameter
Specification
Counter type
Number of channels
Input type
Resolution
Schmitt trigger hysteresis
Event counter
1
Schmitt trigger; fixed 47.5 kΩ pull-down resistor
32 bits
0.6 V min
1.7 V max
1.9 V min
3.6 V max
5.5 V absolute max
1.0 V min
2.3 V max
–0.5 V absolute min
0 V recommended min
10 MHz max
50 ns min
50 ns min
Input high voltage threshold
Input high voltage limit
Input low voltage threshold
Input low voltage limit
Input frequency
High pulse width
Low pulse width
Memory
Table 8. Memory specifications
Parameter
Specification
EEPROM
4,096 bytes
22
OM-NET-TC User's Guide
Specifications
Power
Table 9. Power specifications
Parameter
Conditions
Specification
External power supply
Supply current
User output voltage range
Quiescent current
Available at +VO terminal
User output current
Isolation
Available at +VO terminal
Measurement system to chassis ground
Note 9:
5 V ±5% required
5 V, 1 A supply provided (PS-5V1AEPS)
177 mA typical (Note 9)
4.40 V min to 5.25 V max; assumes
supplied AC adapter is used
10 mA max
500 VDC min
This is the total quiescent current requirement for the device that includes the LEDs. This value does not
include any potential loading of the digital I/O bits or +VO terminal.
Network
Ethernet connection
Table 10. Ethernet connection specifications
Parameter
Ethernet type
Communication rates
Connector
Cable length
Additional parameters
Specification
100 Base-TX
10 Base-T
10/100 Mbps, auto-negotiated
RJ-45, 8 position
100 meters (328 feet) max
HP Auto-MDIX support
Network interface
Table 11. Factory default specifications
Parameter
Specification
Protocols used
TCP (IPv4 only) and UDP
UDP: 54211 (discovery)
UDP: 6234 (bootloader only)
TCP: 54211 (commands)
DHCP + link-local, DHCP, static, link-local
E-TC-xxxxxx, where xxxxxx are the lower 6 digits of the device MAC address
By NBNS; responds to b-node broadcasts, therefore only available on the local subnet
Network ports used
Network IP configuration
Network name
Network name publication
Network factory default settings
Table 12. Factory default specifications
Parameter
Specification
Factory default IP address
Factory default subnet mask
Factory default Gateway
Factory default DHCP
setting
192.168.0.101
255.255.255.0
192.168.0.1
DHCP + link-local enabled
23
OM-NET-TC User's Guide
Specifications
Network security
Table 13. Factory default specifications
Parameter
Security implementation
Number of concurrent sessions
Vulnerabilities
Specification
TCP sockets are not opened unless application sends the correct PIN connection
code; stored in non-volatile memory; may be changed by user; default value is 0000
1
TCP Sequence Number Approximation Vulnerability
LED displays and the factory reset button
Table 14. LED and button configurations
Parameter
Specification
On: 4.2 V < Vext < 5.6 V
Off: Vext < 4.2 V, Vext > 5.6 V (power fault)
Power and Activity LEDs blink continuously in firmware update mode
 On: A valid host connection is established.
 Blinks: A command is received.
Power and Activity LEDs blink continuously in firmware update mode
 Left (green): Link/activity indicator; on when there is a valid Ethernet link, and
blinks when network activity is detected.
 Right (yellow): Speed indicator; on for 100 Mbps, off for 10 Mbps or no link.
Resets network and alarm configuration settings to factory default values.
 Press and hold for 4 seconds. The Power and Activity LEDs will both blink twice
and turn off to indicate that network settings have been restored to default values.
Release the button to allow the device to reset and use the default settings.
If the reset button is released before the two LEDs blink, settings are not affected.
 Holding the reset button at power on forces the device into firmware update mode
in case of a failed firmware update. In this mode, both LEDs blink together
constantly. The device may be returned to normal operation by cycling the power.

Power LED (top)
Activity LED (bottom)
Ethernet connector LEDS
Factory reset button

Environment
Table 15. Environmental specifications
Parameter
Specification
Operating temperature range
Storage temperature range
Humidity
0 °C to 55 °C
–40 °C to 85 °C
0 °C to 90% non-condensing
Mechanical
Table 16. Mechanical specifications
Parameter
Specification
Dimensions (L × W × H)
117.9 × 82.8 × 29.0 mm (4.64 × 3.26 × 1.14 in.)
24
OM-NET-TC User's Guide
Specifications
Screw terminal connector
Table 17. Screw terminal connector specifications
Parameter
Specification
Connector type
Wire gauge range
Screw terminal
16 AWG to 30 AWG
Table 18. Screw terminal pinout
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Signal Name
CH0H
CH0L
CH1H
CH1L
CH2H
CH2L
CH3H
CH3L
CH4H
CH4L
CH5H
CH5L
CH6H
CH6L
CH7H
CH7L
Pin Description
CH0 sensor input (+)
CH0 sensor input (–)
CH1 sensor input (+)
CH1 sensor input (–)
CH2 sensor input (+)
CH2 sensor input (–)
CH3 sensor input (+)
CH3 sensor input (–)
CH4 sensor input (+)
CH4 sensor input (–)
CH5 sensor input (+)
CH5 sensor input (–)
CH6 sensor input (+)
CH6 sensor input (–)
CH7 sensor input (+)
CH7 sensor input (–)
Pin
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
25
Signal Name
DIO0
DIO1
DIO2
DIO3
GND
DIO4
DIO5
DIO6
DIO7
+VO
GND
GND
GND
CTR
GND
CHGND
Pin Description
DIO channel 0
DIO channel 1
DIO channel 2
DIO channel 3
Digital ground
DIO channel 4
DIO channel 5
DIO channel 6
DIO channel 7
User voltage output
Digital ground
Digital ground
Digital ground
Counter input
Digital ground
Chassis ground
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