1794-IT8

The 1794-IT8 is Flex I/O analog input module. Specifically, this is a Thermocouple and millivolt input module. It comes with Eight (8) analog input channels, compatible for direct interfacing with Thermocouple sensors such as J, K, E, R, N, S, B, C, T and L and millivolt range of +/-76.5m.

The 1794-IT8 is compatible with any available Flex I/O communication adapter. This module is a compatible on being operated in Temperature application ranges such as 300 to 1800oC (572 to 3272oF) using Type B Thermocouple; 0 to 2315oC (32 to 4199oF) Type C;–230 to 1000oC (–382 to 1832oF) Type E; –195 to 1200oC (–319 to 2192oF) Type J; –230 to 1372oC (–382 to 2502oF) type K; –270 to 1300oC (–450 to 2372oF) Type N; –50 to 1768oC (–58 to 3214oF) Type R; –50 to 1768oC (–58 to 3214oF) Type S; –195 to 400oC (–319 to 752oF) type T; –175 to 800oC (–283 to 1472oF) type L. Milivolt input signals are practically used with transducers and other instruments that produce non-standard signals. Data exchange with the 1794-IT8 Thermocouple input module is configured using the block transfer operation.

Before inserting the 1794-IT8 module on the terminal base, the users should rotate the key switch on the base to Position 3 because this position is required for the safe mounting and operation of the thermocouple/mV module. The Allen-Bradley 1794-IT8 FLEX I/O thermocouple module communicates with PLCs through the block-transferring option. Block transfer programming relies on input signal data words moving between the thermocouple module’s memory and a designated area in the PLC’s data table. Block transfer programming also supports the moving of the configuration words from the PLC data table to the thermocouple module. The Allen-Bradley 1794-IT8 module comes with 2 cold junction compensators that are engineered to be mounted in designated positions on the terminal base unit. The module can accept grounded and ungrounded thermocouples. The nominal input range for the input signals is -7.65 to 7.65 mV. The module is supplied with 24 Volts DC voltage and it has 16-bit input signal resolution. On the front side of the module, there is 1 inserted label with 8 fields reserved for individual input designations. The 1794-IT8 has a normal mode rejection ratio of -60 dB at 60 Hertz, a common mode input range of +/-10 Volts, and a common mode rejection ratio of -115 dB at 60 Hertz and of 100 dB at 50 Hertz.