Modicon PC-E984-685 Programmable Logic Controller (PLC)

Core Function & Technical Overview

Key Features

1. Processing Power:
• 16-bit CPU with a logic solving speed of 2.0 ms/Kword for real-time control logic execution 
• Supports user logic sizes up to 16K and 4096 RAM state registers for storing program data and inputs/outputs 
2. I/O Capabilities:
• 2048 discrete I/O points (input/output combinations) with 512 I/O bits per substation and a total system capacity of 16,384 I/O bits 
• Compatible with Modicon 800 series I/O modules for analog and digital signal processing.
3. Communication:
• Supports Modbus Plus for high-speed network communication (1 Mbps) with other PLCs, HMIs, and SCADA systems 
• Equipped with RS-232/RS-485 ports for legacy device connectivity 
4. Rugged Design:
• Extended operating temperature range (-40°C to +70°C) for harsh industrial environments, with optional conformal coating for extreme conditions 
• DIN rail-mountable and shock/vibration resistant (15G vibration, 2G shock) 
5. Programming & Configuration:
• Uses Modicon’s Unity Pro or Concept software for ladder logic, structured text, and function block programming 
• Supports IEC 61131-3 standard programming languages for flexibility and interoperability.

Technical Specifications

Key Design Features

1. Modular Architecture:
• Supports rack-based expansion with up to 5 local I/O racks and 31 remote stations for scalability 
• Hot-swap functionality allows module replacement without system downtime.
2. Redundancy & Fault Tolerance:
• Optional dual power supplies for redundancy in mission-critical applications.
• Built-in diagnostics for real-time monitoring of module status and fault detection.
3. Industrial Compatibility:
• Compatible with Modicon 984 series I/O modules (e.g., analog input/output, temperature control).
• Integrates with Schneider Electric’s EcoStruxure platform for advanced analytics and remote monitoring 
4. Safety Compliance:
• Designed to meet IEC 61508 SIL 2 standards for safety-critical applications 

Application Scenarios

1. Industrial Automation:
• Machine control in automotive assembly lines, packaging systems, and robotics.
• Example: Powering robotic arms in automotive plants for precision welding and material handling.
2. Process Control:
• Chemical/petrochemical plants for reactor monitoring, flow control, and batch processing.
• Example: Managing pressure and temperature in oil refinery distillation columns.
3. Transportation:
• Railway signaling systems and electric vehicle (EV) charging infrastructure.
• Example: Controlling traffic lights and safety interlocks in rail yards.
4. HVAC Systems:
• Building automation for heating, ventilation, and air conditioning (HVAC) in data centers and hospitals.
• Example: Optimizing energy consumption in smart building systems.
5. Power Generation:
• Turbine control and generator protection in thermal and nuclear power plants.
• Example: Monitoring steam pressure and grid synchronization in power generation systems.