Description
Schneider Modicon AS-S908-120 AS-9385-002 Remote I/O Processor Module Product Description
Product Overview
Schneider Electric Modicon AS-S908-120 (part number AS-9385-002) is a high-performance Remote I/O Processor Module designed for the Modicon 984 PLC automation platform and S908 Remote I/O architecture. As a key communication and expansion component in legacy industrial control systems, Schneider AS-S908-120 provides reliable data exchange between the central PLC processor and distributed remote I/O racks, enabling flexible field signal acquisition and control expansion. The module is widely used in large-scale manufacturing, process automation, infrastructure control, and industrial machine systems requiring distributed I/O management.
The Schneider AS-S908-120 AS-9385-002 belongs to the Modicon 984 Series remote I/O processor family and functions as an interface between the PLC main controller and remote field I/O stations. Within the automation system architecture, AS-S908-120 manages communication over dual S908 remote I/O cable networks, allowing operators to extend control systems over long distances while maintaining stable real-time data transmission. The module provides efficient scanning performance and supports distributed control applications where centralized PLC processing must communicate with multiple remote I/O locations.
Designed for industrial environments with long service-life requirements, Schneider AS-S908-120 combines robust hardware construction, reliable communication processing, and compatibility with existing Modicon 984 systems. The module is particularly valuable for maintaining and upgrading legacy automation installations where complete system replacement would be costly or disruptive. With its proven S908 remote I/O technology, Schneider AS-S908-120 AS-9385-002 remains an important spare and replacement component for continuous industrial operation.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | AS-S908-120 |
| Part Number | AS-9385-002 |
| Manufacturer | Schneider Electric / Modicon / AEG |
| Product Type | Remote I/O Processor Module |
| Product Series | Modicon 984 Series / S908 Remote I/O |
| Main Function | Dual Remote I/O communication processor |
| Communication Interface | S908 Remote I/O Bus |
| Network Configuration | Dual I/O cable architecture |
| Communication Protocol | Modicon S908 Remote I/O Protocol |
| Bus Current Consumption | Approx. 550 mA |
| Power Dissipation | Approx. 5 W |
| Operating Voltage | 5 VDC system supply |
| Remote I/O Capacity | Supports distributed S908 I/O drops |
| Scan Performance | Approx. 3 ms + 1.3 ms/kB state RAM |
| Operating Temperature | -40°C to +85°C |
| Installation Method | Modicon 984 rack mounting |
| Module Dimensions | Approx. 4 × 15.5 × 25 cm |
| Weight | Approx. 0.68 kg |
AS-S908-120
Application Areas
Manufacturing Automation Systems:
Schneider AS-S908-120 is widely used in factory automation systems where distributed I/O control is required. It enables communication between central PLC processors and remote field devices such as sensors, actuators, motor starters, and operator stations.
Process Control Applications:
Chemical, pharmaceutical, water treatment, and utility facilities often require large-scale distributed control systems. AS-S908-120 AS-9385-002 supports reliable remote signal collection and control execution in these process environments.
Power and Energy Facilities:
Power generation and energy management systems frequently use distributed control architectures. Schneider AS-S908-120 provides stable remote I/O communication for monitoring electrical equipment, auxiliary systems, and field instrumentation.
Machine Automation:
Large industrial machines with multiple control zones benefit from remote I/O expansion. AS-S908-120 allows designers to place I/O modules closer to field devices, reducing wiring complexity and improving system organization.
Infrastructure Control:
Transportation, building infrastructure, and utility automation projects require dependable PLC communication over extended distances. Schneider AS-S908-120 AS-9385-002 provides reliable remote control capability for these applications.
Legacy PLC Maintenance Projects:
Because many Modicon 984 systems remain operational, AS-S908-120 is frequently used in modernization, repair, and spare parts replacement projects to maintain existing automation performance.
Related Products
- Schneider AS-S908-102 – S908 Remote I/O Processor variant with similar remote communication functions.
- Schneider AS-B805-016 – Modicon 800 Series I/O module used with legacy distributed control systems.
- Schneider AS-B875-002 – Remote I/O expansion module for Modicon 984 systems.
- Schneider 140CRA93101 – Modicon Quantum S908 adapter module for migration and communication applications.
- Schneider 140CPU43412 – Quantum PLC CPU module used in newer Modicon architectures.
- Schneider AS-S911-000 – Related S908 remote I/O communication component.
- Schneider 984 Series PLC Processor Modules – Main controller family compatible with AS-S908-120.
- Modicon 800 Series Analog/Digital I/O Modules – Field I/O modules commonly installed with the S908 architecture.
