Product Details

MODICON PC-E984-785 is a high-performance programmable controller and CPU module belonging to the famous Modicon 984 series, widely adopted as the core process processor for medium and large legacy industrial automation systems. This powerful CPU executes ladder logic control programs to collect field signals from sensors, run user-defined control logic, and send output commands to actuators, contactors and valve drivers. It supports optional 32K or 48K user logic memory together with 32K or 64K data memory, and delivers a fast scan speed of 1 ms per thousand instructions to guarantee rapid response for time-critical process loops. Equipped with two Modbus ports and one Modbus Plus port, it can connect to operator panels, remote I/O racks, SCADA hosts and other PLC nodes to build distributed control networks. It supports up to 16384 discrete I/O points and maximum 1088 register I/O, and can expand to multiple local racks and remote drops with matched S908 adapters. Built-in battery backup protects user programs and runtime data against unexpected power failure. LED indicators on the front panel show run status, fault alarm, network activity and memory condition for convenient on-site diagnosis. Integrated EMI filtering and surge suppression circuits shield internal logic circuits from electrical noise and voltage spikes generated by inverters and heavy power equipment. It can be programmed via Modsoft or ProWORX 32 software with LL984 ladder logic. As an obsolete industrial spare part, this CPU module is essential for repairing and upgrading aging Modicon control systems. Direct drop-in replacement keeps the original control program, I/O mapping and network configuration unchanged and greatly reduces commissioning workload and production downtime.

Basic Parameters

Product type: 984 series programmable controller CPU module

Part number: PC-E984-785

Brand: Modicon, Schneider Electric

User logic memory: 32K / 48K optional

Data memory: 32K / 64K optional

Scan time: 1 ms / k logic

Max discrete I/O: 16384 points

Max register I/O: 1088 points

Communication: 2 × Modbus, 1 × Modbus Plus

Expansion: support up to 4 racks and S908 remote I/O

Data retention: battery backup for program and variables

Mounting: plug-in rack mounting

Operating temperature: 0°C ~ +60°C

Protection grade: IP20

Supported Functions

Execute LL984 ladder logic for automated process control

Bidirectional Modbus and Modbus Plus network communication

High-speed acquisition and output of discrete and register I/O

Battery-backed data preservation during power interruption

System self-diagnosis and fault flag output

Noise filtering and surge protection for bus and communication ports

Core Functions

Serve as a reliable programmable controller for legacy process lines

Visual LED indication for quick CPU and network troubleshooting

Act as a central CPU module to coordinate all rack I/O

Work as a stable process processor for continuous production control

Support distributed networking with remote I/O and HMI terminals

Modular replacement for failed main controllers of Modicon 984 systems

Hardware Specifications & Environmental Features

Construction: metal industrial rack plug-in assembly

Weight: approximately 2.27 kg

Storage temperature: -25°C ~ +70°C

Relative humidity: 5% to 95% non-condensing

Condition: obsolete original spare part, available stock

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm rack compatibility, memory configuration, network setting and backup battery condition before ordering.

This is from our current stock.

available stock.xlsx