Model Number Explanation

• AS: Modicon Automation System component

• 884A: Compact 884A CPU series

• 311: Top-tier variant with 8K user memory, dual Modbus ports, RIO support, 115/230V AC power

Technical Specifications

• CPU: 8086 main processor + dual 8051 front‑end processors

• User Logic Memory: 8K words (largest in 884A series)

• Register Memory: 1K words

• Max I/O Capacity: 256 discrete input/output points

• Power Supply: 115/230V AC, 50/60 Hz

• Communication: Dual Modbus RTU ports (RS‑232/485); dedicated RIO network support

• Programming Interface: P190 (programming/diagnostics)

• Operating Temperature: 0°C to +60°C

• Storage Temperature: −40°C to +85°C

• Humidity: 5%–95% non‑condensing

• Dimensions: ≈267 × 89 × 216 mm

• Weight: ≈2.0 kg

• Certifications: CE, UL 508, CSA

Interface & Configuration

• Backplane Connection: Modicon 800/984 series rack connector

• Communication Ports:

  • Port 1: Modbus RTU (RS‑232/485, for HMI/SCADA)

  • Port 2: Modbus RTU (RS‑485, dedicated for RIO)

• Expansion Slots: Supports optional communication/I/O expansion cards

• Mounting: Rack‑mount compatible with Modicon 800/984 series racks

Key Features

• 8K Ultra‑High Memory: Enables large‑scale control programs, extensive data logging, and complex algorithm implementation

• Dual Modbus Ports: Simultaneous connection to HMI/SCADA and distributed RIO networks

• Remote I/O (RIO): Native RIO communication for distributed I/O architectures

• High‑Speed Processing: 8086 + dual 8051 architecture for fast logic execution

• Advanced Diagnostics: Power‑up self‑tests, real‑time fault monitoring, and LED status indicators (PWR/RUN/FAULT)

• Memory Protection Switch: Prevents accidental program overwrites

• Legacy Compatibility: Native fit for Modicon 984/884 series racks and I/O modules

Applications

• Systems: Schneider Modicon 984, 884 series PLC systems

• Industries: Process automation, power generation, water treatment, large‑scale manufacturing, material handling

• Use Cases: Complex machine control, large production lines, distributed I/O systems, legacy system upgrades requiring maximum memory and communication capacity

Compatibility

• I/O Racks: Modicon 800 series I/O racks, 984 series backplanes

• I/O Modules: Modicon 800/984 series digital/analog I/O modules

• Software: Compatible with Modicon Concept, ProWORX 32 programming software

Differences from Other 884A Models

• AS-884A-101: 2K memory, single Modbus port

• AS-884A-111: 2K memory, dual Modbus ports

• AS-884A-201: 3.5K memory, single Modbus port

• AS-884A-311: 8K memory, dual Modbus ports (highest memory and communication in 884A series)