Product Details

Modicon PC-M984-230 is a robust compact plc cpu controller and reliable programmable processor belonging to the Modicon Compact 984 legacy series, manufactured by AEG Modicon. This modicon 984 processor serves as the central processing unit for Compact chassis automation systems, running LL984 ladder logic programmed via Modsoft software. It features 4K words of user program memory and native Modbus Plus communication port for high-speed peer-to-peer data exchange with other Modicon controllers, remote I/O racks and HMI terminals. The unit accepts universal 115/230 VAC power input at 50/60 Hz, rated 1.5 A, integrating built-in power supply and processor circuitry within one compact form factor. It supports expansion with a full lineup of Compact discrete, analog and specialty I/O modules to build custom control systems for continuous and batch processes. Front LED indicators clearly display run status, fault alarm, Modbus Plus activity and system diagnostics for quick on-site troubleshooting. Constructed with industrial grade components and vibration-resistant packaging, it is engineered for long-term continuous operation in dusty, noisy factory environments. As a discontinued legacy spare, this compact plc cpu controller acts as a drop-in replacement to restore core logic and network communication for ageing Modicon Compact automation racks.

Basic Parameters

Brand: Modicon (AEG / Schneider legacy)

Model: PC-M984-230

Product Type: Compact 984 Series PLC CPU Processor

Compatible Rack: Modicon Compact 984 chassis and matching I/O modules

Programming Software: Modsoft

Logic Language: LL984 Ladder Logic

Program Memory: 4K words

Communication: Native Modbus Plus port, supporting Modbus RTU devices

Power Input: 115 / 230 VAC, 50 / 60 Hz, 1.5 A

Memory Backup: Battery-backed RAM for data retention during power loss

Indicator: Front LED for run, fault, network and diagnostic status

Mounting: Single-slot Compact rack mounting

Product Status: Discontinued, end of original production

Net Weight: Approximately 1.32 kg

Supported Functions

This compact plc cpu controller executes cyclic scanning of user ladder logic and all connected expansion I/O. The programmable processor performs timer, counter, arithmetic, comparison and PID closed-loop control for temperature, flow, pressure and level regulation. This modicon 984 processor can exchange real-time tags across Modbus Plus network, supporting peer communication between multiple PLC stations and data transmission to operator panels and SCADA hosts. It supports alarm handling, recipe storage and sequential batch control. It runs comprehensive built-in self-diagnostics to detect memory failure, network dropout, backplane fault and low backup battery voltage. Upon critical faults, it forces outputs to predefined safe states to protect field actuators and process equipment. It can work with remote S908 RIO adapters to extend control signals to distributed field stations.

Core Functions

As the central programmable processor, this compact plc cpu controller interprets user control logic, reads field I/O signals and issues output commands to actuators. Its onboard Modbus Plus interface enables distributed interlocking and plant-wide data sharing among legacy Modicon hardware. This modicon 984 processor works as a direct spare to rebuild the main control brain for ageing Modicon Compact automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Rugged metal-shielded compact module casing

Protection: Hardware watchdog, internal surge suppression, battery backup circuit

Anti-interference: Isolated communication port and filtered power input for EMI suppression

Compatibility: Modicon Compact chassis, Modbus Plus adapters, S908 RIO modules, 984 family I/O

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 program backup, backup battery health, Modbus Plus network termination and Compact backplane compatibility before ordering.

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