Schneider AEG AS-B872-100
The AS-B872-100 is a Modicon 800 series I/O module launched by Schneider Electric (formerly AEG), specially designed for industrial automation systems to deliver reliable digital/analog signal acquisition and output functions. Operating at 24V DC, this module is suitable for harsh industrial environments, supports DIN rail mounting, and is compatible with the AS-i bus network.
Key Technical Specifications
Operating Voltage: 24V DCInput Type: Digital Input (8 channels)Output Type: Digital Output (8 channels) or Analog Output (4 channels, subject to specific models)Input Current: 5mA per channelOutput Current: 14mA per channelCommunication Interface: Modbus RTU (RS-485)Operating Temperature Range: -10°C to 60°CStorage Temperature Range: -40°C to 80°CProtection Class: IP20Dimensions: 115mm × 89mm × 63mm (H × W × D)Weight: Approximately 450g
Product Features
- High Reliability: Adapted to harsh industrial environments with overvoltage, short-circuit and reverse polarity protection.
- Versatile Communication: Supports industrial protocols like Modbus RTU for seamless integration with upper-level systems.
- Flexible Networking: Works as an AS-i slave device, compatible with multiple modules including digital input, digital output, and analog input/output units.
- Diagnostic Functions: Equipped with status indicators, fault detection and diagnostic information for convenient on-site maintenance.
- Easy Configuration: Rapid parameter setting and network layout can be completed with Schneider’s dedicated AS-i configuration software.
Structure & Components
- Module Body: Metal housing with built-in PCB and input/output terminal blocks.
- Terminal Blocks: Screw-type wiring design supporting quick plug-and-play operation.
- Indicators: Power, communication and fault status lights for quick on-site operation status judgment.
- Connectors: Standard AS-i interfaces (e.g., AS-8535-000) for bus cascading.
Typical Application Fields
- Signal acquisition and control of sensors/actuators in automated production lines
- Discrete I/O requirements in process control systems (e.g., chemical, food & beverage industries)
- Status monitoring of logistics and warehousing equipment
- Switch control in energy management systems
Installation & Maintenance Guidelines
Installation Method
Fix via DIN rail, ensure horizontal installation of the module and correct connection with bus ports.
Wiring Notes
Input/output terminals adopt screw fixation; confirm voltage rating before wiring to avoid module damage caused by wrong connection.
Power Check
Ensure stable 24V DC supply before power-on and verify normal operation of the power indicator.
Communication Debugging
Set node addresses via Modbus/AS-i configuration software and check the correctness of RS-485 bus terminal resistors.
Fault Diagnosis
When the fault indicator is on, first check wiring, power supply and communication parameters; use Schneider diagnostic tools to read error codes if necessary.
Regular Maintenance
Remove dust, check terminal tightness and keep heat dissipation channels unobstructed to prevent performance degradation due to environmental factors.

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