Description

The Allen Bradley’s 1794-IT8 is an input module from the Flex I/O product line. This model has eight input channels. Its compatible sensors work with a voltage range of +/-76.5m. It is also compatible with any Flex I/O adapter. In addition, this module has a FlexBus current rating of 20 milliAmps and has a 16-bit resolution. It has a red/green indicator that shows the status of the power on top of the module.

• Keyswitch Position 3
• Module Location: 1794-TB2, -TB3 and -TB3T Terminal Base Units
• CJC unit: A-B Part Number 969424–0
• Indicator: 1 red/green power status indicator
• Data Format: 16-bit 2’s complement or offset binary (unipolar)
• millivolt signal: +/- 76. 5mV
• Sensors supported: J, K, E, R, N, S, B, C, T and L
• No. of Inputs: 8
• Part Number: 1794- IT8
• Product Family: Flex I/O Modules
• Part Number/Catalog: No. 1794-IT8
• Product Type: Thermocouple / milivolt Input Module
• Resolution: 16 bits (2.384 microvolts typical)
• Power Dissipation: 3W maximum @ 31.2V
• Inputs: 8 Channels
• Nominal Input Ranges: -76.5 to 76.5 mV
• Isolation Voltage: 850 Volts DC
• Normal Mode Noise Rejection: -60db at 60 Hertz
• Channel Bandwidth: 0 to 2.62 Hertz
• Normal Mode System Throughput: 325 milliseconds
• Flexbus Current: 20 mA
• Thermal Dissipation: 10.2 BTU/hour at 31.2 Volts DC maximum

The Allen Bradley 1794-IT8 is a thermocouple/millivolt Input Module, commonly referred to as a Flex I/O module. It has a total of eight input channels that are compatible with the J, K, E, R, N, S, B, C, T, and L sensors that accept millivolt signal +/- 76 5mV voltage range. In addition, it has a nominal input voltage range of is -76.5 to 76.5 mV, and its isolation voltage range is 850 Volts DC. Apart from that, the module’s noise rejection in normal mode is -60db at 60 Hz, with a channel bandwidth of 0 to 2.62 Hz. This thermocouple input module’s normal mode system throughput range is 325 milliseconds. The flex bus current range is 20 mA on this module, and its thermal dissipation at 31.2 Volts DC maximum is 10.2 BTU/hour.

The terminal base units 1794-TB2, -TB3, and -TB3T are where the module is located. Concerning configuration, users must adjust the key switch on the base to state three since this is necessary for this module to be mounted and used correctly. Besides that, the block transferring technique on this input module enables it to communicate with PLCs. Likewise, the same technique is based on input signal data words transferring between the PLC’s memory and a specific area in the data table. The users should check the manufacturing guidelines for the use of the latest programming tools and other significant temperature ratings for the proper maintenance of this input module.