Product Details

Modicon 410-3/S908 is a legacy s908 remote i/o interface and reliable rio communication adapter built for Modicon 984 series PLC racks. This distributed i/o board serves as the hardware interface between the host PLC backplane and the S908 remote I/O bus, handling the proprietary S908 RIO protocol to exchange data with remote I/O drops across the plant. It supports single cable S908 bus layout and manages cyclic input sampling and output refresh for remote 800-series I/O racks, transmitting real‑time digital and analog process data between the central controller and distributed field stations. Front status LEDs offer quick visual diagnosis for bus activity, communication faults and power status, while dedicated terminal blocks simplify coaxial bus wiring and termination setup. As a discontinued legacy spare, this s908 remote i/o interface acts as a drop‑in replacement to restore S908 distributed remote I/O communication for ageing Modicon automation racks.

Basic Parameters

Brand: Modicon (AEG legacy)

Model: 410-3/S908

Product Type: S908 Remote I/O Communication Interface Adapter

Compatible Rack: Modicon 984 PLC chassis, 800 series remote I/O drops

Bus Protocol: Modicon proprietary S908 RIO

Bus Media: Coaxial cable

Max Remote Drops: Up to 32 remote I/O stations

Indicator: Front LED for power, run, bus traffic and fault

Termination: Screw terminal for S908 bus connection

Form Factor: Chassis slot mounted

Product Status: Discontinued, end of production

Net Weight: Approximately 1.05 kg

Supported Functions

This s908 remote i/o interface performs cyclic data scanning over the S908 bus, collecting input values from remote I/O racks and writing output commands sent by the host CPU. The rio communication adapter executes message framing, checksum verification and automatic retry for corrupted bus telegrams. This distributed i/o board runs continuous self‑diagnosis to detect bus break, missing drops, improper termination and backplane communication errors. It can coordinate multiple remote I/O racks to expand control capacity, supporting mixed discrete and analog I/O modules for distributed process control. It will flag faults and freeze outputs into safe states once critical bus failures are detected.

Core Functions

As a dedicated rio communication adapter, this s908 remote i/o interface bridges the local PLC backplane and the S908 remote I/O fieldbus, enabling distributed I/O deployment over long cable runs. It offloads remote bus protocol processing from the main CPU and isolates bus faults to avoid crashing the central rack. This distributed i/o board serves as a direct spare to rebuild stable S908 remote I/O networking for ageing Modicon 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 chassis module

Protection: Bus surge suppression, built‑in watchdog

Anti-interference: Coaxial differential transmission to resist industrial EMI

Compatibility: Modicon 984 CPUs, AS-S908 series processors, 800 series remote I/O racks

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 S908 bus termination, drop address assignment, cable type and backplane compatibility before ordering.

This is from our current stock.

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