The Allen Bradley 1756-IRT8I module is a high-resolution analog I/O module. Especially, it is an eight (8) point isolated temperature detection module that is compatible with RTD, thermocouples, and millivolt signals. This module is part of the ControlLogix system and requires a 36 pin RTB or a Removable Terminal Block (RTB). The compatible RTB is 1756-TBCH or 1756-TBS6H. It has two CJC sensors for thermocouples. The accuracy of the CJC sensor is+/-0.3 degrees Celsius, and the channel sampling rate of the module is only determined by the RPI value, as the 1756-IRT8I does not provide RTS parameters. In addition, when the module power is cycled, the channel configured for thermocouple input will perform lead resistance self calibration. The characteristics of the 1756-IRT8I module include multiple input ranges, notch filters, under range/over range detection, digital filters, process alarms, rate alarms, sensor offsets, 10 ohm copper offsets, wire breakage detection, temperature units, sensor types, thermocouple wire length compensation, synchronous sampling, and cold junction compensation. The 1756-IRT8I has multiple input ranges, namely 1 to 500 ohms, 2 to 1000 ohms, 4 to 2000 ohms, 8 to 4000 ohms, and -100 to 100 millivolts. It supports 24 bit resolution, ranging from 0 to 510 ohms, 0.06 milliohms per count, 0 to 1020 ohms per count, 0.12 milliohms per count, 0 to 2040 ohms per count, 0.25 milliohms per count, 0 to 4080 ohms per count, 0.50 milliohms per count, and -101 to 101 millivolts per count, 0.01 microvolts per count. The supported RTD sensors include 100, 200, 500, and 1000 ohm platinum, alpha=385, 100, 200, 500, and 1000 ohm platinum, alpha=3916 and 120 ohm nickel, alpha=672, 100, 120, 200, and 500 ohm nickel, alpha=618, and 10 ohm copper, alpha=427. The RTD excitation current of the module is 600 microamperes. The thermocouple types for this module are B, C, D, E, J, K, N, R, S, T, and TXK/XK (L). Its thermocouple is linearized to ITS-90. For thermocouple inputs and three wire RTD inputs, the open circuit detection time of this module is 2 seconds, and for four wire RTD inputs, the open circuit detection time is 5 seconds. It should be noted that when the wires are simultaneously disconnected from the INx/RTD C and INx/RTD D terminals on the same channel, an open circuit will not be detected (x represents the channel number). This module has noise suppression function. In normal mode, it is 75 dB at 60 Hz. In common mode, 125 dB at 60 Hz 1000 ohm differential, 120 dB at 50 Hz 1000 ohm differential, and 160 dB at 600 V 100 ohm differential. Allen Bradley 1756-IRT8I is a ControlLogix analog input module with eight (8) configurable channels for resistance temperature detectors (RTDs), thermocouples, and millivolt inputs.

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