Omega OMB-DAQ-TC-RACK Owner Manual

User’s Guide

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SM

e-mail: [email protected]

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OMB-DAQ-TC-RACK

32-Channel USB/Ethernet Based

Thermocouple Input

Data Acquisition System

U.S.A.:

omega.com [email protected]

Servicing North America:

Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

Stamford, CT 06907-0047 USA

Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)

Engineering Service: 1-800-872-9436 (USA & Canada only)

Tel: (203) 359-1660 Fax: (203) 359-7700 e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.

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 OMB-DAQ-TC-RACK................................................................................................. 6

Ethernet interface................................................................................................................................................. 6

USB interface....................................................................................................................................................... 6

Functional block diagram .................................................................................................................................... 7

Chapter 2

Installing the OMB-DAQ-TC-RACK..................................................................................................... 8

Unpacking............................................................................................................................................................ 8

Installing the software.......................................................................................................................................... 8

Connecting the external power adapter ............................................................................................................... 8

Installing the hardware......................................................................................................................................... 8

Installing on USB................................................................................................................................................................ 8

IP address settings ............................................................................................................................................................... 9

Setting up the OMB-DAQ-TC-RACK for communication across networks .................................................... 10

Calibrating the hardware.................................................................................................................................... 10

Restoring factory default network settings ........................................................................................................ 10

Chapter 3

Functional Details .............................................................................................................................. 11

External components.......................................................................................................................................... 11

Ethernet connector............................................................................................................................................................. 11

External power connector.................................................................................................................................................. 11

TC input connectors, measurements, and LED................................................................................................................. 11

Digital I/O ......................................................................................................................................................................... 13

LED indicators .................................................................................................................................................................. 14

EXPANSION connector ................................................................................................................................................... 14

Chassis ground connector.................................................................................................................................................. 14

RESET button ................................................................................................................................................................... 15

Mechanical drawings ......................................................................................................................................... 16

Chapter 4

Specifications..................................................................................................................................... 18

Thermocouple input........................................................................................................................................... 18

Channel configuration........................................................................................................................................ 19

Compatible thermocouple sensors ..................................................................................................................... 19

Accuracy ............................................................................................................................................................ 20

Thermocouple measurement accuracy .............................................................................................................................. 20

Digital input/output............................................................................................................................................ 20

Temperature alarms ........................................................................................................................................... 21

Memory.............................................................................................................................................................. 21

Microcontroller .................................................................................................................................................. 22

Power ................................................................................................................................................................. 22

USB.................................................................................................................................................................... 22

Network ............................................................................................................................................................. 23

3

OMB-DAQ-TC-RACK User's Guide

Ethernet connection........................................................................................................................................................... 23

Network interface.............................................................................................................................................................. 23

Network factory default settings ....................................................................................................................................... 23

Network security ............................................................................................................................................................... 23

LED displays and the factory reset button......................................................................................................... 24

Environment....................................................................................................................................................... 24

Mechanical......................................................................................................................................................... 24

Signal I/O connectors......................................................................................................................................... 24

4

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing OMB-DAQ-TC-RACK data acquisition device and lists device specifications.

Conventions in this user's guide

For more information

Text presented in a box signifies additional information related to the subject matter.

Shaded caution statements present information to help you avoid injuring yourself and others, damaging your hardware, or losing your data. bold text

italic text

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 OMB-DAQ-TC-RACK hardware is available on our website at www.omega.com

.

You can also contact Omega Engineering by phone, fax, or email with specific questions.

Phone

Email:

: (203) 359-1660

Fax: (203) 359-7700 [email protected]

5

Introducing the OMB-DAQ-TC-RACK

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•

•

•

•

•

•

•

•

•

•

•

The OMB-DAQ-TC-RACK is a dual-interface data acquisition device that provides the following features:

32 differential thermocouple (TC) inputs, expandable to 64 channels with

OMB-DAQ-TC-RACK-EXP32 expansion device

Two 24-bit ADCs (one ADC per 16 inputs)

1

TC channels field-to-host isolation

3 S/s per update rate

Support for type J, K, R, S, T, N, E, and B thermocouples, software-selectable per channel

One integrated cold junction compensation (CJC) sensor per TC input

Open thermocouple detection (OTD) to detect faulty TC connections

8 digital inputs, isolated from TC and host

32 digital outputs/alarms isolated from TC inputs and host

DIO connections are made to 50-pin header connector

USB 2.0 or 10/100 Ethernet interface

Powered by the included +5 V external power adapter (OMB-DAQ-TC-RACK-PS)

Ethernet interface

The OMB-DAQ-TC-RACK has a built-in 10/100 BASE-T auto-negotiation, high-speed communication port.

With the Ethernet interface, you can remotely access and configure your OMB-DAQ-TC-RACK from anywhere on the network. Only one computer can control the OMB-DAQ-TC-RACK at a time.

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

TC-32-xxxxxx

, where xxxxxx are the lower six digits of the factory-assigned MAC address.

USB interface

The OMB-DAQ-TC-RACK is a USB 2.0 full-speed device that is compatible with USB 3.0 ports. The device is also compatible with USB 1.1 ports.

1 40-pin ribbon cable for the EXPANSION connector is included with the OMB-TC-RACK-EXP.

6


Functional block diagram

Device functions are illustrated in the block diagram shown here:

Introducing the OMB-DAQ-TC-RACK

Figure 1. OMB-DAQ-TC-RACK functional block diagram

7

Installing the OMB-DAQ-TC-RACK

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

.

Connecting the external power adapter

Connect the adapter cord to the power connector on the OMB-DAQ-TC-RACK device, and plug the AC adapter into an electrical outlet.

The

Power

LED turns on when 5 V power is supplied to the OMB-DAQ-TC-RACK. If the voltage supply is less than 4.0 V or more than 5.75 V, the POWER LED does not turn on.

Refer to Figure 2 on page 11 for the location of the

Power

LED.

Installing the hardware

The OMB-DAQ-TC-RACK can run on either a USB or Ethernet interface.

Installing on USB

Connect the OMB-DAQ-TC-RACK using the cable provided to a to a USB port on a computer running

Windows. Windows finds and installs the device driver automatically, and notifies you that the device is ready to use.

Installing on Ethernet

The OMB-DAQ-TC-RACK requires a TCP/IP and UDP connection to a network or computer. Use the standard

Ethernet port, hub, or switch.

When connecting the OMB-DAQ-TC-RACK 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 OMB-DAQ-TC-RACK is physically connected to the local network or PC, you can run the software

(InstaCal for example) to establish a connection. If a connection cannot be established, make sure the device is using the default configuration by following the instructions in the Restoring factory default network settings on page 10.

Once a connection is established and you can communicate to the device, you can change the configuration for other network scenarios.

8

OMB-DAQ-TC-RACK User's Guide Installing the OMB-DAQ-TC-RACK

Configuring network settings

The following OMB-DAQ-TC-RACK network settings are software-selectable. Only one user at a time can connect to the OMB-DAQ-TC-RACK 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 OMB-DAQ-TC-RACK 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 IP addresses to the

OMB-DAQ-TC-RACK.

If the connected network does not have a DHCP server, the address stored in the default IP address is assigned to the OMB-DAQ-TC-RACK.

If the OMB-DAQ-TC-RACK 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

OMB-DAQ-TC-RACK and the device to which it is connected

DHCP Only

Enables configuration by a DHCP server if one is available. The OMB-DAQ-TC-RACK is assigned an IP address shortly after it is powered up and attached to the network.

Link Local Only

The OMB-DAQ-TC-RACK 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

OMB-DAQ-TC-RACK and the device to which it is connected.

Static

The default IPv4 Address is manually configured on the OMB-DAQ-TC-RACK.

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•

•

IP address settings

The default settings of the following IP address are assigned to the OMB-DAQ-TC-RACK when automatic addressing is disabled or not available (DHCP or Link Local for example)

IPv4 address

Subnet mask

– The IP address that is stored on the device. The default IPv4 address is 192.168.0.101.

– The Subnet mask that is stored on the OMB-DAQ-TC-RACK . 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 OMB-DAQ-TC-RACK. 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.

9

OMB-DAQ-TC-RACK User's Guide Installing the OMB-DAQ-TC-RACK

Setting up the OMB-DAQ-TC-RACK for communication across networks

In order to communicate with the OMB-DAQ-TC-RACK 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 OMB-DAQ-TC-RACK 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.

This procedure should only be performed by a network administrator or computer professional.

Incorrect settings can significantly disrupt a network.

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:

UDP:54211 (discovery)

TCP:54211 (commands)

3. 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 OMB-DAQ-TC-RACK.

Calibrating the hardware

Factory calibration

Omega Engineering performs the initial factory calibration. Return the device to Omega Engineering when calibration is required. The recommended calibration interval is one year.

Field calibration

The OMB-DAQ-TC-RACK supports field calibration. Calibrate the device using InstaCal whenever the ambient temperature changes by more than ±10 °C from the last calibration.

The following items are required to perform field calibration on a OMB-DAQ-TC-RACK:

•

• a precision voltage source a voltmeter

Each ADC (two ADCs per device) is measured at three points and a linear correction is calculated.

When prompted, enter the voltmeter reading to a precision of three decimal places.

Omega Engineering strongly recommends that you warm up the OMB-DAQ-TC-RACK 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. Use a ballpoint pen to press and hold in the Reset button for at least four seconds until both the Power and

Activity LEDs blink , indicating that the settings have been restored to the factory defaults.

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.

If InstaCal is open when default settings are restored, click the

Refresh Boards button on the InstaCal toolbar to reflect the changes.

10

Functional Details

External components

OMB-DAQ-TC-RACK front panel components are shown in Figure 2.

1 TC input channels 0 through 31 (32 mini-jack connectors)

2

3

POWER LED

ACTIVITY LED

4 ALARM

LED

5 OPEN TC

LED

Figure 2. OMB-DAQ-TC-RACK front panel components

OMB-DAQ-TC-RACK rear panel components are shown in Figure 3.

3

4

1

2

5

Factory

USB

RESET connector

ETHERNET

External power (

Power switch ( button connector

EXT DC ) connector

PWR )

6

Chassis ground connector

7

40-pin EXPANSION connector

8

Eight digital input ( DIN ) pull-up switches

9

32 digital output ( DOUT ) pull-up switches

10

50-pin DIGITAL I/O connector

Figure 3. OMB-DAQ-TC-RACK rear panel components

USB connector

The USB connector provides USB communication.

Ethernet connector

The OMB-DAQ-TC-RACK 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 OMB-DAQ-TC-RACK-PS power supply to this connector. The power supply provides 5 VDC,

2 A power to the OMB-DAQ-TC-RACK.

TC input connectors, measurements, and LED

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.

11

OMB-DAQ-TC-RACK User's Guide Functional Details

You can add another 32 differential TC input connections to mini-jack connectors labeled CH0 through CH31

(refer to Figure 2).

The device supports type J, K, S, R, B, E, T, N thermocouples.

Omega Engineering strongly recommends that you ground yourself using a wrist strap before handling the thermocouple sensors.

Connecting TCs to common-mode voltage sources

•

•

You can connect a thermocouple to a common voltage source (AC or DC) as long as the magnitude of the voltage is within the common mode voltage range specification of 48V (DC) or 3.5V p-p (AC).

Each applied common mode voltage must be less than or equal to the average common mode voltage ±1.4 V.

For example, in Figure 4, there are three TCs connected to three different common mode voltage sources and two thermocouples that are not connected to anything (floating).

In this example, the average common mode voltage is calculated as follows: (11.4 V+ 10 V + 8.6 V)/3 = 10 V

Each TC channel becomes biased to the average common mode voltage of 10 V.

Each common mode voltage must then be within the 10 V ±1.4 V limits or 8.6 V to 11.4 V.

Figure 4. OMB-DAQ-TC-RACK common mode voltage connections example

Cold junction compensation (CJC)

Each TC input on the OMB-DAQ-TC-RACK has a high-resolution CJC sensor. When you connect the thermocouple sensor leads to the sensor input channel, the dissimilar metals at the OMB-DAQ-TC-RACK 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 OMB-DAQ-TC-RACK 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.

12


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 OMB-DAQ-TC-RACK is equipped with OTD for all analog input channel. With OTD, 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, 75 nA (max) 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 75 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, 2 nA (max) of input leakage current is injected into the TC.

Digital I/O

The OMB-DAQ-TC-RACK provides eight digital inputs and 32 digital outputs that are electrically isolated from the host computer and from the OMB-DAQ-TC-RACK analog circuits.

All DIO bits have internal pull-up resistors to 5 V that can be disconnected with the rear panel slide switches.

The recommended maximum length of the 50-pin cable used to connect the DIGITAL I/O connector to the digital I/O signal source is 1 foot.

Digital inputs

The OMB-DAQ-TC-RACK provides eight digital inputs with rates of 500 port reads or single bit reads per second.

Digital input voltage ranges of 0 V to 15 V are permitted, with thresholds of 0.6 V (low) and 2.2 V (high).

Each digital input has a 100 k pull-up resistor. Use the eight PULL-UP ENABLE – DIN slide switches to enable or disable the 5 V pull-up option.

5Digital outputs/temperature alarms

Each digital output is open-drain, which can of sink up to 100 mA for direct drive applications. Each output has pull-up option.

PULL-UP ENABLE – DOUT slide switches to enable or disable the 5 V

6Optionally, 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.

The alarm configurations are stored in non-volatile memory and loaded at power up.

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.

Each available alarm mode and setting is explained below.

13


Alarm input modes

Set independent temperature thresholds T1 and T2 for each alarm.

Alarm error modes input temperature < T2

Trigger alarm when input temperature T1; reset alarm when input temperature > T2

Trigger alarm when input temperature is < T1 or > T2

Alarm on temperature reading only

Alarm on temperature reading, open thermocouple, or commonmode voltage error

Alarm on open thermocouple or common-mode voltage error only

Alarm output modes

Alarm disabled; digital output line can be used for normal operation alarm condition is met)

Alarm enabled; active high output (output line goes high when alarm condition is met) cleared by the user

The OMB-DAQ-TC-RACK provides three alarm indicators – the ALARM LED , the OPEN TC LED on the

Because the digital alarm outputs are user-configurable, they can be used to supply additional information or differentiating between threshold and CMV alarms.

Pull-up configuration

By default, pull-up is enabled for all eight digital inputs and all 32 digital outputs. Slide switches on the rear of the housing can disable pull-up for each digital input bit and digital output bit.

LED indicators

The OMB-DAQ-TC-RACK has four LEDs that indicate the power, communication, alarm, and open TC status

POWER LED 2

The POWER LED turns on when you plug the power adapter into the OMB-DAQ-TC-RACK. If a Flash LED command is sent from an application, the Power LED blinks five times.

ACTIVITY LED 2

The

ACTIVITY

LED turns on when there is a valid connection (USB or Ethernet) and blinks when a command is sent to the OMB-DAQ-TC-RACK.

ALARM LED

The ALARM LED turns on when an alarm condition occurs.

OPEN TC LED

The

OPEN TC

LED turns on when there is an open thermocouple condition.

EXPANSION connector

Use the EXPANSION connector to connect the OMB-DAQ-TC-RACK to an OMB-TC-RACK-EXP32 expansion device (sold separately) for applications that need additional analog/thermocouple input and digital I/O channels. A 40-pin expansion cable is included with the OMB-DAQ-TC-RACK-EXP32.

Chassis ground connector

Provides a connection point (#6-32 screw) for chassis ground. Connect this to an external grounding source.

2 Both the POWER and ACTIVITY LEDs blink in firmware upgrade mode. Refer to Updating firmware on page 10.

14


If the OMB-DAQ-TC-RACK is connected by USB or by a shielded Ethernet cable to grounded equipment, connecting to an external grounding source is not needed since the USB/shielded Ethernet connection already grounds the OMB-DAQ-TC-RACK and a connected OMB-DAQ-TC-RACK-EXP32.

RESET button

Press and hold this button to restore the OMB-DAQ-TC-RACK to its factory default network settings. Refer to

Restoring factory default network settings on page 10

15


Mechanical drawings

Functional Details

Figure 7. Enclosure dimensions - front

16

Figure 8. Enclosure dimensions - rear


Figure 9. Enclosure dimensions – side

Functional Details

Figure 10. Circuit board dimensions

17

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. Generic analog input specifications

Parameter

A/D converter type

A/D resolution

Number of channels

Filtering options

Isolation

Channel configuration

Differential input voltage range

Absolute maximum input voltage

Differential input impedance

Input current

Common mode rejection

Noise rejection

Input bandwidth

Crosstalk

Sample rate (Note 1)

Input noise

Gain error

Offset error

Condition Specification

Delta-Sigma

24-bit

32 selectable

Between any TCx channel and chassis ground.

Between any two TCx inputs

50 Hz filtering, power on

60 Hz filtering, power on

Open thermocouple detect disabled

Open thermocouple detect enabled

50 Hz filtering, at DC and f

60 Hz filtering at DC and f

50 Hz filtering at f

60 Hz filtering at f

50 Hz filtering in in in

=50 Hz

=60 Hz in

60 Hz filtering

Between any two TCx inputs

=50 Hz

=60 Hz

500 VDC absolute max

Software-selectable to match thermocouple sensor type

±78.125 mV

±25 V (power on)

±25 V (power off)

26 M

20 M

2 nA

75 nA

110 dB

110 dB

80 dB typ.

80 dB typ.

22 Hz

26 Hz

-90 dB

3 Hz max (per channel)

±1.40 V TCx channel to TCx channel

TCx channel relative to chassis in

= 60 Hz

±3.5 VAC p-p

TCx channel relative to chassis ground ±48 V DC

50 Hz or 60 Hz filtering



Thermocouple type J,K,T,E,N

Thermocouple type R,S

Thermocouple type B

510 nV rms

0.004 % FSR

3 µV

0.07°C

0.18°C

0.60°C

20 minutes min Warm-up time

Open thermocouple detect response time

CJC sensor accuracy

Note 1:

Note 2:

0°C to 45°C

1 second

±0.20°C typ

±0.40°C max

The enabled thermocouple inputs are continuously converted at the maximum A/D converter rate.

When thermocouple sensors are connected to different common mode voltages, the channels with floating thermocouples sensors will be biased to approximately the average value of the applied common mode voltages. Each of the applied common mode voltages must then be less than or equal to the average common mode voltage ±1.40 V or [CMV applied

(CMV average

±1.4 V)].

18

OMB-DAQ-TC-RACK User's Guide Specifications

Note 2:

Note 3: floating thermocouples sensors will be biased to approximately the average value of the applied common mode voltages. Each of the applied common mode voltages must then be less than or equal to the average common mode voltage ±1.40 V or [CMV applied

(CMV average

±1.4 V)].

Measurement sensitivity is the smallest change in temperature that can be detected.

Channel configuration

Table 2. Channel configuration specification

Sensor Category Condition Specification

Thermocouple

Note 4:

J, K, S, R, B, E, T, N 32 differential channels

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 from an external application, and the configuration is made non-volatile through the use of the EEPROM.

Compatible thermocouple sensors

Table 3. Compatible sensor type specifications

Parameter

Thermocouple

Specification

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

19


Accuracy

Thermocouple measurement accuracy

Table 4. Thermocouple accuracy specifications, including CJC measurement error. All specifications are (±).

Sensor

Type

J

K

S

R

B

E

T

N

Sensor

Temperature

(°C)

250

1768

–50

250

1768

250

700

1820

–200

0

1000

–200

0

400

–200

0

1300

–210

0

1200

–210

0

1372

–50

Accuracy Error

Maximum (°C),

15°C to 35°C

1.965

0.787

0.752

2.295

0.821

1.029

2.467

1.835

0.893

2.609

1.862

0.754

2.450

0.937

0.610

1.754

0.775

0.657

2.005

0.836

0.544

2.255

0.908

0.718

Accuracy Error

Typical (°C),

15°C to 35°C

0.910

0.361

0.371

1.061

0.376

0.504

1.111

0.825

0.361

1.174

0.837

0.305

1.090

0.424

0.300

0.811

0.355

0.323

0.923

0.382

0.255

1.038

0.415

0.357

Accuracy Error

Maximum (°C),

0°C to 45°C

2.167

0.816

1.148

2.520

0.852

1.560

2.655

1.961

1.519

2.810

1.992

1.346

2.707

1.136

1.056

1.933

0.806

0.989

2.207

0.874

0.659

2.481

0.949

1.157

0.904

0.590

1.293

0.918

0.520

1.254

0.520

0.467

0.880

0.369

0.437

Accuracy Error

Typical (°C),

0°C to 45°C

0.989

0.375

0.508

1.152

0.392

0.688

1.223

1.005

0.400

0.297

1.134

0.437

0.510

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 with the enclosure in a horizontal, upright orientation. The board should also be warmed up for the recommended 20 minutes. If the maximum digital output load of 3.2 amps is applied, add an additional 0.30°C to the typical and maximum accuracy specifications listed above. Errors shown do not include inherent

Digital input/output

Parameter

Number of inputs

Configuration

Input voltage range

Input type

Input characteristics

Maximum input voltage range

Pull-up configuration

Transfer rate (software paced)

Input high voltage

Input low voltage

Schmitt trigger hysteresis

Table 5. Digital input specifications

Specification

8 channels

Fixed input

0 V to +15 V

CMOS (Schmitt trigger)

100 k pull-up resistor, 28.7 k series resistor

0 V to +20 V max (power on/off, relative to IGND pins)

All pins pulled up to +5 V via individual 100 k resistors using slide switch SW5.

SW5 default positions are on (pulled up.)

500 port reads per second typ.

1.3 V min, 2.2 V max

1.5 V max, 0.6 V min

0.4 V min, 1.2 V max

20


Table 6. Digital output specifications

Parameter

Number of outputs

Configuration

Output characteristics

Pull-up configuration

Transfer rate (software-paced)

Output voltage range

Off state leakage current

Sink current capability

DMOS transistor on-resistance

(drain to source)

Note 5:

Specification

32 channels, shared with alarms

Open drain output

100 k pull-up, open drain (DMOS transistor)

All pins pulled up to +5 V via individual 100 k resistors using slide switches

SW1-SW4. The default positions for SW1-4 are on (pulled up.)

Digital output – 500 port writes per second typ.

0 V to +5 V (internal 100 k pull-up resistors connected to +5 V by default)

0 V to +15 V max (using external pull up resistor)

0.1 µA

100 mA max (continuous) per output pin

4

Ground pins labeled IGND are isolated from AGND and chassis ground.

Temperature alarms

Table 7. Temperature alarm specifications

Parameter

Number of alarms

Alarm functionality

Alarm input modes

Alarm error modes

Alarm output modes

Alarm latency (Note 6)

Note 6:

Specification

32, shared with digital output

Each alarm controls its associated digital output line as an alarm output. When an alarm is enabled, its associated output line is 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

Note: T1 and T2 may be independently set for each alarm.

Alarm on temperature reading only

Alarm on temperature reading, open thermocouple, or common-mode voltage error

Alarm on open thermocouple or common-mode voltage error only

Disabled, digital output line may be used for normal operation

Enabled, active high output (output line goes high when alarm condition is met)

Enabled, active low output (output line goes low when alarm condition is met)

Alarm output may be latched and will not clear unless explicitly cleared by the user

1 second, max

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.

Memory

Parameter

EEPROM

Table 8. Memory specifications

Specification

8,192 bytes

21


Microcontroller

Parameter

Type

Table 9. Microcontroller specifications

Specification

One high-performance 32-bit RISC microcontroller (communications)

One high-performance 32-bit RISC microcontroller (measurement)

Power

Table 10. Power specifications

Parameter

Supply current

External power input (Note 5)

Power switch

External power supply (included)

External power input voltage supervisor limits

Chassis ground connection

Note 7:

Conditions

Omega Engineering p/n OMB-DAQ-

TC-RACK-PS

4.0 V > V ext

4.0 V < V ext

> 5.75 V

< 5.75 V

Specification

330 mA typ, 610 mA max

550 mA typ, 1000 mA max (with OMB-

DAQ-TC-RACK-EXP32 connected)

+5 VDC ± 5%

(+5 VDC power supply provided)

Rocker type

+5 VDC, 10 W, 5% regulation

PWR LED = Off (power fault)

PWR LED = On

6-32 screw on rear of enclosure

Voltage specification applies at barrel plug power input. The power supply provided with the device meets this specification at the rated total power supply current. If a different power supply is used, small line resistances could cause significant voltage drop between the power supply and the barrel plug input.

USB

Parameter

Device type

Device compatibility

Connector

Cable length

Power

Table 11. USB specifications

Specification

USB 2.0 full speed

USB 1.1, USB 2.0, USB 3.0

Standard B

5 meters max

Self-powered (no USB current consumed)

22


Network

Ethernet connection

Parameter

Ethernet type

Communication rates

Connector

Cable length

Additional parameters

Parameter

Factory default IP address

Factory default subnet mask

Factory default gateway

Factory default DHCP setting

Network security

Table 12. Ethernet connection specifications

Specification

100 Base-TX

10 Base-T

10/100 Mbps, auto-negotiated

RJ-45, 8 position

100 meters max

HP Auto-MDIX support

Network interface

Parameter

Protocols used

Network ports used

Network IP configuration

Network name

Network name publication

Table 13. Factory default specifications

Specification

TCP/IP (IPv4 only), UDP

UDP:54211 (discovery)

TCP:54211 (commands)

DHCP + link-local, DHCP, static, link-local

TC-32-xxxxxx address

, where xxxxxx are the lower 6 digits of the device MAC

By NBNS (responds to b-node broadcasts, therefore only available on the local subnet)

Network factory default settings


Specification

192.168.0.101

255.255.255.0

192.168.0.1

DHCP + link-local enabled

Parameter

Security implementation

Number of concurrent sessions

Vulnerabilities


Specification in non-volatile memory, may be changed by user, default value 0000)

1

TCP Sequence Number Approximation Vulnerability

23


LED displays and the factory reset button

Table 16. LED and button configurations

Parameter

POWER LED (top)

ACTIVITY LED

ALARM LED

OPEN TC LED (bottom)

Factory reset button

Specification

Indicates power on. Blinks when blink command is sent. Both the POWER and

ACTIVITY LEDs blink in firmware upgrade mode.

On when there is a valid connection and blinks when a command is sent to the

OMB-DAQ-TC-RACK. Both the POWER and ACTIVITY LEDs blink in firmware upgrade mode.

Indicates that an alarm condition is met.

Indicates that there is an open thermocouple condition.

process. When the LEDs turn back on, reset is complete and the factory-default network settings are restored.

Environment

Parameter

Operating temperature range

Storage temperature range

Humidity

Table 17. Environmental specifications

Specification

0°C to 45°C

–40°C to 85°C

0°C to 90% non-condensing

Mechanical

Parameter

Dimensions (L W H)

Table 18. Mechanical specifications

Specification

482.6 128.6 43.18 mm (19 6.15 1.74 in.)

Signal I/O connectors

Parameter

User accessible I/O connectors

(excluding USB and Ethernet)

Thermocouple connector type

Digital I/O connector type

Compatible cable for the 50-pin

DIO connector with the C50FF-2 and C50FF-15 cables

Expansion connector type

Compatible cables for the 40-pin expansion connector

Chassis ground connector

Table 19. Connector specifications

Specification

Thermocouple inputs, digital I/O connector, expansion connector, chassis ground

Thermocouple Mini-Jack (Omega PCC-SMP-V-U-100)

50-pin IDC header

C50FF-2, C50FF-15

CIO-MINI50

40-pin IDC header

C40FF-2

6-32 screw

24


Pin Signal Name

TC0(+)

J1

TC0(-)

J2

TC1(+)

TC1(-)

J3

J4

TC2(+)

TC2(-)

TC3(+)

TC3(-)

TC4(+)

J5

J6

J7

J8

J9

TC4(-)

TC5(+)

TC5(-)

TC6(+)

TC6(-)

TC7(+)

TC7(-)

TC8(+)

TC8(-)

TC9(+)

J10

J11

J12

J13

J14

TC9(-)

TC10(+)

TC10(-)

TC11(+)

TC11(-)

TC12(+)

TC12(-)

TC13(+)

TC13(-)

TC14(+)

J15

J16

TC14(-)

TC15(+)

TC15(-)

Table 20. Thermocouple connector pinout

Pin Description

CH0 sensor input (+)

CH0 sensor input (–)































Pin

J17

J18

J19

J20

J21

J22

J23

J24

J25

J26

J27

J28

J29

J30

J31

J32

TC25(-)

TC26(+)

TC26(-)

TC27(+)

TC27(-)

TC28(+)

TC28(-)

TC29(+)

TC29(-)

TC30(+)

TC30(-)

TC31(+)

TC31(-)

TC20(-)

TC21(+)

TC21(-)

TC22(+)

TC22(-)

TC23(+)

TC23(-)

TC24(+)

TC24(-)

TC25(+)

Signal Name Pin Description

TC16(+) CH16 sensor input (+)

TC16(-)

TC17(+)



TC17(-)

TC18(+)

TC18(-)

TC19(+)

TC19(-)

TC20(+)






























Specifications

25


41

43

45

47

49

33

35

37

39

21

23

25

27

29

31

11

13

15

17

19

Pin Signal Name

1 DOUT0

3

5

DOUT2

DOUT4

7

9

DOUT6

DOUT8

DOUT10

DOUT12

DOUT14

IGND

IGND

DOUT16

DOUT18

DOUT20

DOUT22

DOUT24

DOUT26

DOUT28

DOUT30

IGND

IGND

DIN0

DIN2

DIN4

DIN6

IGND

Table 21. Digital I/O connector (J33) pinout

Pin Description

Digital Output 0/ Alarm Output 0








Isolated Digital GND












Digital Input 0

Digital Input 2

Digital Input 4

Digital Input 6


22

24

26

28

30

32

34

36

38

40

42

44

46

48

50

Pin

2

4

6

8

10

12

14

16

18

20


DOUT1 Digital Output 1/ Alarm Output 1

DOUT3

DOUT5



DOUT7

DOUT9



DOUT11

DOUT13

DOUT15

IGND

IGND

DOUT17

DOUT19

DOUT21

DOUT23

DOUT25

DOUT27

DOUT29

DOUT31

IGND

IGND






Digital Output 17 / Alarm Output 17




Digital Output 25 / Alarm Output 25






DIN1

DIN3

DIN5

DIN7

IGND

Digital Input 1

Digital Input 3

Digital Input 5

Digital Input 7


Table 22. Expansion connector (J34) pinout

7

9

11

13

15

17

Pin Signal Name

1 +12VA (Note)

3

5

+12VA

+5VA

+5VA

+5VA

+5VA

+3.3VA

+3.3VA

+3.3VA

Pin Description

+12 VA power output

+12 VA power output

+5 VA power output

+5 VA power output

+5 VA power output

+5 VA power output

+3.3 VA power output



Note 8

8

10

12

14

16

18

Pin

2

4

6


AGND Isolated Analog GND

AGND

AGND

Isolated Analog GND

Isolated Analog GND

AGND

AGND

AGND

AGND

AGND

AGND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

19 +3.3VA +3.3 VA power output 20 AGND Isolated Analog GND

21

23

25

27

29

31

33

35

37

39

CS

SCK

MOSI

MISO

Chip select

Serial clock

Master output data

Master input data

IRQ

RSVD

Interrupt request

Reserved

RSVD

RSVD

RSVD

Reserved

Reserved

Reserved

EXP_DETECT EXP detection

22

24

26

28

30

32

34

36

38

40

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Isolated Analog GND

Note 8: Power supplies (+12 VA, +5 VA, 3.3 VA) located at connector J34 are intended for use with the

OMB-DAQ-TC-RACK-EXP32 expansion device only.

26

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service

Department will issue an Authorized Return (AR) number immediately upon phone or written request.

Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,

OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR

REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF

TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY

AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF

LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of

OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic

Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify

OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the

Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE

RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)

NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING

DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information available BEFORE contacting

OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems

relative to the product.

FOR NON-WARRANTY REPAIRS, consult

OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST

of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.

© Copyright 2016 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

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