Overview
The Schneider Electric Modicon B231-501 is a discrete input module designed for legacy PLC systems and industrial control applications. This 115VAC-rated module accepts 16 digital inputs with a configuration of 4 inputs per common, making it ideal for signal processing in remote I/O drop applications. The B231-501 is part of the Modicon automation platform and has been discontinued by the manufacturer, making tested surplus units valuable for maintenance and replacement in existing systems.
Key Features
- 16 discrete digital inputs with 4 inputs per common
- 115VAC power supply requirement
- Suitable for remote I/O drop applications
- Operates within 0–40°C temperature range
- Tolerates up to 80% relative humidity (non-condensing)
- Drop-in replacement for legacy Modicon 200-series systems
Technical Specifications
The B231-501 delivers reliable discrete input handling for industrial control scenarios. Its operating environment specification ensures compatibility with standard factory conditions without excessive climate control. The module’s compact design integrates seamlessly into existing Modicon PLC racks and enclosures.
Typical Applications
- Legacy Modicon 984 and 200-series PLC systems
- Remote I/O signal acquisition for discrete devices
- Industrial machinery control and motor circuit monitoring
- Building automation and HVAC control systems
- Production line input modules for safety and process control
Compatibility & Replacements
Compatible With
- Modicon 984-series PLCs
- Modicon 200-series controllers
- AS-B231 series racks and frames
- Legacy Gould Modicon automation systems
Replaces / Drop-In Replacement For
- AS-B231-501 (functionally equivalent)
- Older Modicon 200-series input modules with matching pinout
- Custom or original equipment manufacturer (OEM) discrete input cards designed for 16-point 115VAC applications
Works With
- Modicon programming software and ladder logic platforms
- Legacy control networks and hardwired signal inputs
- Discrete 115VAC field devices and sensor inputs
- Standard industrial PLC communication protocols supported by Modicon racks
