Overview
The Modicon AS-S908-110 is a remote I/O processor option module designed for Modicon 984 and Quantum Automation Series PLCs. This unit, identified by part number AS-9385-001, provides the protocol processing and communication interface required to establish distributed remote I/O networks using coaxial cable infrastructure. The module occupies a single option slot within compatible controllers and handles all S908 protocol communication between the CPU and remote I/O drops.
Key Features
- Remote I/O network support for up to 31 remote drops on 984 controllers
- Single coaxial cable connection for straightforward topology implementation
- Support for Modicon 800-series and Quantum I/O modules at remote locations
- Two ASCII communication ports per drop available (maximum 32 ports across network)
- Implements industry-standard S908 remote I/O protocol
- Compatible with both dual and single cable configurations via variant models
Technical Specifications
- Part Number: AS-S908-110 / AS-9385-001
- Processor Type: Remote I/O Communication Module
- Manufacturer: Modicon / Schneider Automation
- Protocol: S908 Remote I/O (RIO)
- Option Slot Requirement: 1 slot in 984-685 or 984-785 controller
- Cable Interface: Coaxial connector (single cable configuration)
- Maximum Remote Drops: 31 (984 controllers)
- I/O Module Support: 800-series and Quantum I/O families
- Communication Ports: 2 ASCII per drop (32 max total)
Typical Applications
- Distributed manufacturing systems with PLC-based I/O located away from main controller housing
- Machine tool automation requiring remote sensor and actuator networks
- Multi-station production lines with centralized PLC control
- Process automation installations where I/O must be placed at remote equipment locations
- Legacy system upgrades and maintenance for existing Modicon 984/Quantum installations
- Data acquisition networks requiring remote communication via serial ASCII ports
Compatibility & Replacements
Compatible With
- Modicon 984-685 PLC controller (with option slot)
- Modicon 984-785 PLC controller (with option slot)
- Quantum Automation Series CPUs
- Modicon 800-series remote I/O modules
- Modicon Quantum I/O modules
- S908 remote I/O coaxial cable systems
Replaces / Drop-In Replacement For
- AS-S908-001 (single cable, alternate configuration)
- Legacy Gould and AEG S908 processors with equivalent 984 PLC support
Works With
- S908 Remote I/O protocol and network infrastructure
- MODSOFT programming environment for 984 controllers
- Modicon remote I/O cable systems (taps, terminators, connectors)
- ASCII serial communication interfaces for remote data ports
