IC3603A278E - 8-Channel Thermocouple Processor Assembly Module

SPECIFICATIONS:

Part No: IC3603A278E
Manufacturer: General Electric
Number of Channels: 8
Product Type: 8-Channel Thermocouple Processor Assembly Module
Series: Mark I & II
Accuracy ± 0.2 %
Analog I/O Note: 100 ms
Common Mode Voltage: ±7.5V
Impedance Input: 2 MΩ
Conversion Rate: 100 ms
Thermocouple Types: J, K, T, E, R, S, B, N
Voltage Measurement Range: ±70 mV
Environmental conditions: 0 to 50°C
Availability: In Stock
Weight: 2.5 kg
Dimensions: 7.91 x 4.09 x 1.34 in
Country of Origin: USA

FUNCTIONAL DESCRIPTION:

IC3603A278E is an 8-Channel Thermocouple Processor Assembly Module manufactured and designed by General Electric and is part of the Mark II Series used in Static Starter Control systems. The thermocouple/mV module receives and stores digitally converted thermocouple and/or millivolt (mV) analog data into its image table for retrieval by all fixed and modular SLC 500 processors. The module supports connections from any combination of up to four thermocouple or mV analog sensors. The following tables define thermocouple types and their associated full-scale temperature ranges, and also list the millivolt analog input signal ranges that each 1746-NT4 channel will support. Each input channel is individually configurable for a specific input device and provides open-circuit, over-range, and under-range detection and indication.

HARDWARE FEATURES:

The thermocouple module fits into any single-slot, except the processor slot (0), in either an SLC 500 modular system or an SLC 500 fixed system expansion chassis (1746-A2). It is a Class 1 module (uses 8 input words and 8 output words). It interfaces to thermocouple types J, K, T, E, R, S, B, and N, and supports direct ±50 mV and ±100 mV analog input signals. The module requires the use of Block Transfer in a remote configuration. The module contains a removable terminal block providing connection for four thermocouples and/or analog input devices. There are also two cold-junction compensation (CJC) sensors used to compensate for offset voltages introduced into the input signal as a result of the cold-junction, i.e., where the thermocouple wires connect to the module wiring terminal. There are no output channels on the module. Module configuration is done via the user program. There are no DIP switches.

GENERAL DIAGNOSTICS FEATURES:

The thermocouple/mV module contains diagnostic features that can help you identify the source of problems that may occur during power-up or normal channel operation. The thermocouple module communicates to the SLC 500 processor through the parallel backplane interface and receives +5V dc and +24V dc power from the SLC 500 power supply through the backplane. No external power supply is required. You may install as many thermocouple modules in your system as the power supply can support. Each channel on the thermocouple module can receive input signals from thermocouple sensors or mV analog input devices. You configure each channel to accept either input. When configured for thermocouple input types, the thermocouple module converts the analog input voltages into cold-junction compensated and linearized, digital temperature readings.

SYSTEM OPERATION:

At power-up, the thermocouple module performs a check of its internal circuits, memory, and basic functions. During this time, the module status LED remains off. If no faults are found during the power-up diagnostics, the module status LED is turned on. After power-up checks are complete, the thermocouple module waits for valid channel configuration data from your SLC ladder logic program (channel status LEDs off). After configuration data is written to one or more channel configuration words and their channel enable status bits are set, the channel status LEDs go on, and the thermocouple module continuously converts the thermocouple or millivolt input to a value within the range you selected for the enabled channels.

MODULE OPERATION:

The thermocouple module input circuitry consists of four differential analog inputs multiplexed into a single analog-to-digital (A/D) converter. The mux circuitry also continuously samples the CJC A and CJC B sensors and compensates for temperature changes at the cold junction (terminal block). The figure on the following page shows a block diagram for the analog input circuitry. The A/D converter reads the selected input signal and converts it to a digital value. The multiplexer sequentially switches each input channel to the module’s A/D converter. Multiplexing provides an economical means for a single A/D converter to convert multiple analog signals. However, it does affect the speed at which an input signal can change and still be detected by the converter.

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FREQUENTLY ASKED QUESTIONS:

What is an 8-Channel Thermocouple Processor Assembly Module?

It is an industrial module designed to process temperature signals from up to 8 thermocouple inputs, convert them into digital data, and transmit that data to a control system such as a PLC or DCS.

Which thermocouple types are supported by this module?

This module is designed to interface with a wide range of thermocouple types, including J, K, T, E, R, S, B, and N. This flexibility allows it to accommodate various industrial applications where different temperature ranges and accuracies are required.

How many input channels does the thermocouple module provide?

The module features eight individually configurable input channels. Each channel can be set up to accept a specific thermocouple type or mV analog input, allowing for customized and flexible system configurations.

What is the conversion rate of the analog signals?

The analog input signals are converted at a rate of 100 milliseconds. This fast conversion allows for real-time temperature monitoring and quick data processing across all channels.