SCHNEIDER AS-S908-120 Remote I/O Processor Module

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SCHNEIDER AS-S908-120

The SCHNEIDER AS-S908-120 is a legacy Modicon 984 Series Remote I/O Processor Module designed for distributed industrial automation systems. It serves as a remote I/O communication processor, enabling reliable data exchange between a Modicon PLC and remote I/O networks. The module is commonly identified as a S908 Remote I/O Driver with Dual Coax communication capability.

Technical Description

• Manufacturer: Schneider Electric
• Product Series: Modicon 984
• Model Number: AS-S908-120
• Function: Remote I/O Processor / Driver Module
• Communication Medium: Dual Coaxial Remote I/O Network
• Alternative Model Reference: AS-9385-002
• Typical Application: Distributed I/O control for large-scale automation systems
• Approximate Weight: 1.1 kg (2.4 lbs)
• Architecture: Supports remote racks and field I/O expansion for Modicon PLC systems.

Key Features

• High-speed remote I/O communication.
• Dual-coax network architecture for increased reliability.
• Supports distributed control system layouts.
• Compatible with legacy Modicon 984 automation platforms.
• Designed for continuous industrial operation.
• Facilitates expansion of I/O capacity without increasing local rack requirements.

Applications

The AS-S908-120 is widely used in:

• Manufacturing automation systems
• Process control plants
• Power generation facilities
• Water and wastewater treatment
• Chemical and petrochemical industries
• Large machine control systems requiring remote I/O distribution

Its remote communication capability makes it suitable for installations where field devices are located far from the main PLC rack.

Advantages

• Reduces field wiring costs through remote I/O architecture.
• Improves system scalability and flexibility.
• Provides reliable communication between PLCs and remote devices.
• Supports legacy Modicon installations where modernization is not yet practical.
• Proven performance in industrial environments.

Conclusion

The Schneider Electric AS-S908-120 is a specialized Remote I/O Processor Module for the Modicon 984 platform. With dual-coax communication capability and support for distributed I/O architectures, it remains an important component in many legacy industrial automation systems. Although discontinued, it is still commonly used for maintenance, repair, and system expansion projects involving existing Modicon installations.