The Allen Bradley 1756-IT6I2 is an analog I/O module. This module is an enhanced thermocouple analog input module. That features Six (6) individually isolated thermocouple inputs and 2 CJC inputs. Thermocouple types compatible for this module are B, E, J, K, R, S, T, N, C, D, and L (TXK/XK).
This module is installed to any ControlLogix chassis. It requires a Removable Terminal Block for wiring of signal wiring, specifically, only the 1756-TBNH is compatible for this module. The operating input ranges and resolutions of the 1756-IT6I2 module are -12 to 78 microvolts (1.4 microvolts per bit) and -12 to 30 mV (0.7microvolts per bit for the highest resolution range) and 16-bit resolution respectively. It has an input impedance of more than 10MOhms and a maximum overvoltage protection of 120 Volts AC/DC. Both the total backplane power and maximum power dissipation are 4.6Watts. Its thermocouple linearization is ITS-90 and offset drift is 0.5 microvolts per Degree Celsius. It also has a settling time of greater than 80 milliseconds to 5% of full scale and a channel bandwidth of 15 Hertz. Thermal dissipation is 15.7 BTU/hour. The 1756-IT6I2 has an open circuit detection time with a positive full-scale reading of 2 seconds. The integrated noise rejection in normal mode, is 60 dB at 60 Hertz while in common mode, it is a minimum of 160 dB, tested at 600 Volts AC/60 Hertz applied with 100 Ohms differential resistance. This module allows data format selection such as integer mode or a floating-point mode. Other features of the 1756-IT6I2 module include cold junction compensation, multiple input ranges, temperature units, notch filter, sensor type, real-time sampling, wire off detection, under-range/over-range detection, 10 ohms offset, a digital filter (only available in applications using floating point mode), rate alarm, and process alarms.
The Allen Bradley 1756-IT6I2 is a ControlLogix analog input module. This module is an enhanced Thermocouple Input module that is used for Temperature measurements. It supports a wide variety of Temperature range that varies according to the thermocouple type configured. This module supports stand-alone ControlLogix implementation or Distributed I/O technology.
It is compatible for use with ControlLogix processors and communications modules. The installation limit for this module depends on the processor memory and the available slot of a specific chassis.
The 1756-ITI2 is compatible for Thermocouple sensor types such as B, E, J, K, R, S, T, N, C, D, L (TXK/XK). It features 16-Bit resolution with an analog to digital conversion method of Sigma-Delta.
The data tables are used to store the signal processed by the module, the diagnostic state and configuration parameters. Depending on the parameter, a certain bit or registers may be read, written or both.
The information within the data table is capable of being mapped to a computer-based control system for providing a readout. They may also be used in specific parts of the user program for implementation of comparison instructions to be used in dynamically configurable process alarms, arithmetic instructions and control algorithms.
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| Manufacturer | Rockwell Automation |
| Brand | Allen Bradley |
| Part Number/Catalog No. | 1756-IT6I2 |
| Series | ControlLogix |
| Module Type | Analog Thermocouple Module |
| Inputs | 6 Isolated Thermocouple, 2 CJC |
| No. of Inputs | Six (6) Point Isolated Thermocouple Inputs |
| Input Resolution | 16 bits -12…78 mV: 1.4 ?V/bit (typical) -12…30 mV: 0.7 ?V/bit (high resolution range)Input Range |
| Backplane Current (24Volts) | 120 milliamps |
| Module Scan Time | 25 ms min floating point (millivolt) 50 ms min floating point (temperature) 10 ms min integer (millivolt)(1) |
| Data Format | Integer mode (left justified, 2s complement) IEEE 32-bit floating point |
| Backplane Current (5Volts) | 200 milliamps |
| Supported Sensors | B, C, D, E, J, K, L, N, R, S, T |
| Backplane Current (24 Volts) | 150 milliamps |
| Removeable Terminal Blocks | 1756-TBNH, 1756-TBSH |
| Backplane Current at 24 Volts | 2 milliamperes |
| Power Dissipation (Max) | 4.6 Watts |
| Removable Terminal Blocks | 1756-TBNH |