Overview
The Modicon AS-B872-100 is a digital-to-analog output module designed for legacy Modicon and AEG automation systems. This D/A module converts digital signals into analog outputs within the 4 to 20 mA range. The AS-B872-100 has four channels, enabling multi-channel process control in industrial environments. This module integrates directly into Modicon 800-series I/O systems and supports material handling, packaging, and textile machine applications.
Key Features
- 4-channel D/A converter — Independent 4-20mA outputs for simultaneous analog signal generation
- High resolution & accuracy — 12-bit resolution with ±0.1% accuracy of full scale at 25°C
- Extended loop voltage support — Maximum loop supply voltage of 60 Vdc
- Field-proven legacy module — Compatible with established Modicon control architectures
- Swing-arm terminal mounting — Installed using the AS-8535-000 terminal connector for secure, reliable connections
Technical Specifications
- Output Type: 4-20mA analog current, 4 channels
- Resolution: 12-bit
- Accuracy: ±0.1% of full scale @ 25°C
- Output Current Range: 4 to 20 mA per channel
- Maximum Loop Supply Voltage: 60 Vdc
- Installation: AS-8535-000 terminal connector (swing-arm mount)
- Typical Applications: Process control, proportional valve drivers, analog instrumentation
- Manufacturer: Modicon (Schneider Electric AEG legacy)
Typical Applications
The Modicon AS-B872-100 is widely used in:
- Material handling and packaging machinery — Controlling motor speed, conveyor positioning, and load adjustment via analog setpoints
- Textile machine automation — Precise tension control and spindle speed regulation
- Process instrumentation — Driving analog transmitters, pressure transducers, and proportional hydraulic or pneumatic valves
- Legacy system upgrades — Bridging older Modicon 800-series logic to modern fieldbus gateways via controlled analog outputs
- Quality control loops — Closed-loop feedback for batch processes requiring stable 4-20mA signal generation
Compatibility & Replacements
Compatible With
- Modicon 800-series PLC systems and I/O bases
- AEG/Schneider Electric legacy automation platforms
- Swing-arm mounted 800-series I/O chassis
- External 4-20mA load devices rated up to 550–1000 ohms
- Industrial process control systems requiring analog current outputs
Replaces / Drop-In Replacement For
- Legacy Modicon B872-100 modules in swing-arm baseplates
- Original equipment B872-100 analog output cards in decommissioned or refurbished Modicon systems
- Verify compatibility with your system integrator before ordering.
Works With
- Modicon M84, M340, and legacy 800-series control platforms
- AS-8535-000 terminal connector and wiring harnesses
- 4-20mA industrial field devices (proportional valves, transmitters, solenoids)
- Process instrumentation and SCADA integration via analog loop isolation
- Rockwell Automation conversion modules (1756-OF6CI as modern replacement)
