MODICON AS-C921-101 Communication Processor Module

Technical Specifications

Model: AS-C921-101 Brand: MODICON(AEG/Schneider) Product Type: 984 Series Rack Mount Communication Processor Interface Module Power Supply: 5VDC backplane power Current Consumption: 250mA Digital I/O: 16 digital input channels, 8 digital output channels Communication: Modbus RTU serial interface Mounting: Backplane rack slot mount Operating temperature: -10℃ ~ +50℃ Storage temperature: -20℃ ~ +70℃ Relative humidity: 10%~95%, non-condensing Weight: 0.95kg Dimension: 260mm140mm30mm Protection: IP20

System compatibility

AS-C921-101 belongs to MODICON 984 series communication processor module. Compatible with MODICON 984 CPU and matching rack backplane. It acts as dedicated communication interface for Modbus network connection. Suitable for maintenance and replacement of legacy control systems in chemical plants, water treatment, power plants and packaging machinery.

Function

AS-C921-101 rack communication processor card. It provides Modbus RTU communication channel for 984 PLC rack, handles data exchange between host CPU and remote Modbus devices. It also integrates 16 digital input and 8 digital output points for local discrete signal acquisition and control. Built-in hardware self-diagnosis and watchdog circuit. Front panel LED indicators for communication status and I/O channel status. Widely used for serial communication and auxiliary I/O processing in legacy MODICON 984 automation system.

Installation

Cut off rack power before installation. Insert AS-C921-101 module into MODICON 984 backplane slot and lock the card. Check gold finger contact condition. Connect Modbus serial cable and field I/O wiring. Configure Modbus address and communication parameters, test data transmission and I/O signal before formal operation.

Interface

Backplane bus connector, Modbus serial port, field I/O terminal block, communication / channel status LED indicators for AS-C921-101 MODICON communication processor.

Feature

MODICON AS-C921-101 communication processor, 5VDC backplane powered, 16DI+8DO integrated I/O, Modbus RTU communication, hardware self-diagnosis, watchdog function, single slot rack design, industrial anti-interference design. This discontinued legacy industrial spare part used for old MODICON 984 PLC rack communication and auxiliary I/O maintenance and replacement.

Diagnostic

Module not detected by CPU: check backplane 5VDC supply and module seating for AS-C921-101. Modbus communication failure: verify serial cable, baud rate, parity, stop bits and shielding grounding. I/O channel no response: inspect field wiring and terminal contact. Intermittent communication dropout: check gold finger pins and component aging.

Product Brief

AS-C921-101 is AEG MODICON 984 series rack communication processor module. It offers Modbus RTU communication and integrated 16-point digital input / 8-point digital output for Modicon 984 PLC rack, classic spare part for legacy MODICON industrial automation rack overhaul.

Disclaimer: All parameters are for reference only and shall not be used as the basis for quotation. Goods are scarce, overseas delivery lead time is 3-7 working days. It is only used for equipment maintenance and renovation.