MODICON PC-E984-381 PLC CPU Module

Technical Specifications

Model: PC-E984-381 Brand: MODICON(Schneider) Product Type: 984 Series Rack Mount CPU Controller Processor: 16-bit CPU, 24-bit memory architecture Logic execution speed: 2.5ms per 1000 logic nodes Program Memory: 8K words Built-in function: Time-of-day real-time clock Communication: Dual Modbus serial ports Mounting: Backplane rack slot mount Operating temperature: 0℃ ~ +60℃ Storage temperature: -20℃ ~ +70℃ Relative humidity: 5%~95%, non-condensing Weight: 1.2kg Dimension: 260mm140mm30mm Protection: IP20

System compatibility

PC-E984-381 belongs to MODICON 984 series CPU. Compatible with 800 series I/O modules and matching rack backplane. It can work with Modbus compatible HMI and field devices. Suitable for maintenance and replacement of legacy control systems in chemical plants, water treatment, power plants and packaging machinery.

Function

PC-E984-381 main CPU for Modicon 984 rack system. It executes ladder logic programs, scans discrete and analog I/O modules on backplane, performs timer, counter, arithmetic and PID calculations. Dual Modbus serial ports support data exchange with HMI and remote devices. The integrated real-time clock supports time sequence control. Lithium backup battery retains user program and runtime data after power loss. Built-in hardware watchdog and power-up self-diagnosis. Front panel LED indicators: POWER OK, READY, RUN, BATTERY LOW, Modbus port status. Widely used for process and machine control in legacy MODICON automation system.

Installation

Cut off rack power before installation. Insert PC-E984-381 CPU module into MODICON 984 backplane slot and lock the card. Check gold finger contact condition. Connect power wiring and Modbus communication cables. Download PLC program, verify I/O scanning and Modbus communication before formal operation.

Interface

Backplane bus connector, power terminal block, dual Modbus serial ports, front panel status LED indicators for PC-E984-381 MODICON 984 CPU.

Feature

MODICON PC-E984-381 984 rack CPU, 8K program memory, 2.5ms /1k logic nodes, built-in RTC clock, dual Modbus communication ports, battery backup memory, hardware watchdog, self-diagnosis, industrial anti-interference design. This discontinued legacy industrial spare part used for old MODICON 984 PLC rack main control maintenance and replacement.

Diagnostic

CPU no power: check rack power supply, fuse and wiring for PC-E984-381. Fault LED active: inspect program checksum error, memory corruption or low backup battery. Modbus communication failure: verify serial cable, baud rate, parity and shielding grounding. I/O modules not detected: check backplane power and module seating. Intermittent runtime fault: check loose backplane connector and component aging.

Product Brief

PC-E984-381 is MODICON 984 series rack mount PLC CPU. It runs ladder logic, scans I/O modules, supports dual Modbus serial communication and real-time clock function, 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.