Allen-Bradley 1746-IA4 Digital Input Module

The AB 1746-IA4 is a digital input module designed for Allen-Bradley's SLC 500 programmable logic controllers (PLCs). It allows your PLC to read the on/off state of external digital devices.

Specifications:
Number of Input Channels: 4 channels
Input Type: AC Voltage (Alternating Current)
Voltage Rating: 85 to 132 Volts AC (accepts a range of AC voltages within this limit)
Current Draw: Low current consumption, typically around 0.27 Watts per channel
Response Time: Signal delay between input change and the PLC recognizing it, can be either 35 milliseconds or 45 milliseconds depending on the module revision

Features:
Compact Design: Saves space in your control cabinet
Easy Installation: Uses a standard SLC 500 backplane connector
LED Status Indicators: Provides visual indication of the state of each input channel (on/off)
North American Hazardous Location Approved: This indicates the module meets specific safety standards for use in hazardous environments where flammable materials might be present

Applications:
Industrial Automation: Reading the on/off state of switches, limit switches, pushbuttons, and other digital sensors used in industrial equipment operation.
Machine Control: Monitoring the status of machine components like safety interlocks, conveyor stops, and other binary (on/off) signals for machine operation sequences.
Building Automation Systems: Interfacing with digital sensors for door access control, security alarms, and other on/off signals within a building.

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