PLCs, Power Supplies & Others

Product Overview

This CPU module functions as the primary controller for Schneider Electric’s compact automation platforms. It executes user programs and manages all I/O communication with consistent reliability. The PCA984120 provides efficient processing for small to medium-scale control applications. Its compact form factor fits easily into space-limited control panels and cabinets. This processor handles both discrete logic and basic analog control tasks simultaneously.

Technical Specifications

The PCA984120 measures 18.0 cm in width, 13.5 cm in height, and 12.0 cm in depth. It weighs approximately 2.1 kg, including the integrated power supply unit. This module draws 600 mA from the 24 VDC input supply during normal operation. It features 24 discrete inputs and 16 discrete outputs integrated directly on the base unit. The CPU includes one RS232 and one RS485 communication port for flexible connectivity. Its internal memory stores up to 12,000 instruction words for application programs. A lithium battery retains program data for approximately 3 years during power interruptions. The processor executes basic logic instructions in 1.8 ms for dependable scan times. It supports up to 32 expansion I/O modules for future system growth. The front panel provides LED indicators for power, run, fault, and communication activity.

Processing Architecture and System Integration

This CPU executes programs developed in Schneider Electric’s proprietary programming environment. It supports ladder logic and function block diagram languages for flexible development. The PCA984120 scans inputs, executes logic, and updates outputs in a continuous cycle. Users can monitor program execution and modify variables through the communication ports. The processor includes built-in diagnostic routines for fault detection and system protection.

Physical and Electrical Parameters

Installation and Configuration Steps

Mount the PCA984120 vertically on a flat panel surface using the four mounting screws. Connect the 24 VDC power source to the designated terminal block positions. Wire field devices to the integrated input and output terminals accordingly. Connect the programming cable to either the RS232 or RS485 port for software access. Download the user application through the programming interface after completing the configuration. The CPU automatically executes the program when you switch the operating mode to RUN.

Typical Applications

This CPU controls packaging machinery, small conveyor systems, and assembly operations. It manages pump stations, fan controls, and material handling equipment effectively. The PCA984120 also serves HVAC systems, building automation, and small process skids. Its integrated I/O makes it ideal for standalone machine control without additional modules.

Details