Model Number Explanation

AS: Modicon Automation System component

984B: 984 series high-density I/O chassis platform

128: Maximum 128 I/O points capacity

Technical Specifications

I/O Capacity: 128 points (discrete/analog mixed)

Backplane: 8-slot high-current backplane (PC-0984-8)

Power Supply: AS-P930-007 (115/220V AC, 15A)

Processor: AS-C916-000 CPU module (24-bit, 128K logic memory)

Communication: AS-C921-100 Modbus interface module

Memory: AS-M909-000 + AS-S902 memory modules (128K words)

I/O Processor: AS-S901-100 (high-speed I/O scanning)

Operating Temperature: 0°C to +60°C

Humidity: 5%–95% non-condensing

Dimensions: ≈483 × 133 × 356 mm

Weight: ≈6.28 kg (13.85 lbs)

Certifications: CE, UL 508, CSA

Interface & Configuration

Backplane Connection: 984 series high-current backplane connector

I/O Slots: 8 slots (CPU, power supply, communication, 4–6 I/O modules)

Communication Ports: Modbus RTU (RS-232/485) via AS-C921-100

Status Indicators: PWR, RUN, FAULT LEDs on front panel

Mounting: Rack-mount (standard 19-inch industrial rack)

Key Features

High I/O Density: 128 I/O points in a compact 8-slot chassis

Integrated System: Combines CPU, power supply, communication, and I/O in one unit

Large Memory: 128K words for complex programs and data logging

High-Speed Scanning: AS-S901-100 I/O processor for fast response

Robust Protection: Overvoltage, overcurrent, short-circuit protection

Legacy Compatibility: Native fit for Modicon 984 series systems

Applications

Systems: Modicon 984 series PLC systems

Industries: Process automation, power generation, oil & gas, water treatment, large manufacturing

Use Cases: Large control panels, distributed I/O systems, redundant PLC setups, legacy system upgrades

Compatibility

Racks: Modicon 984 series 8-slot backplanes

CPUs: AS-C916-000, AS-9370-001 (984-680)

I/O Modules: Modicon 984 series digital/analog I/O

Software: Concept, ProWORX 32, P190 programming software

Status

Discontinued: Obsolete, no longer manufactured by Schneider Electric

Availability: Only refurbished/used units on the market (e.g., PremiumPLC, Radwell)