Allen-Bradley 1746-IO4 Combination Module

The AB 1746-IO4 is a combination module designed for use with Allen-Bradley's SLC 500 programmable logic controllers (PLCs) [1]. It combines both digital input and digital output functionalities in a single module, saving space in your control cabinet.

Overview:
Offers 4 digital input channels and 4 digital output channels within a single module [1].
Provides a cost-effective solution for applications requiring a mix of digital input and output signals.

Features:
Compact Design: Saves space in your control cabinet compared to using separate input and output modules.
Easy Installation: Uses a standard SLC 500 backplane connector for straightforward integration into your PLC system.
LED Status Indicators: Provides visual indication of the state of each input and output channel (on/off) for troubleshooting and monitoring purposes.

Digital Input:
Likely compatible with DC voltage sources (typical range for SLC 500 digital input modules is 10 to 30 VDC).
Suitable for interfacing with pushbuttons, limit switches, and other digital sensors that provide on/off signals.

Digital Output:
Most likely features a sink configuration (supplies current to ground when turned on) which is common for SLC 500 digital output modules.
Capable of driving various DC loads like solenoids, indicator lights, and relays up to a specified current rating (details might be in the user manual).

Applications:
Industrial Automation Systems: Suitable for controlling simple machines or processes that require a combination of reading digital sensor states and controlling digital actuators.
Data Acquisition Systems: Can be used in basic data acquisition setups where you need to read digital sensor data (on/off) and trigger external devices based on PLC program logic.
Building Automation: Reading switch states or sensor signals from a building environment and controlling lighting or other digital equipment based on the PLC program.

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