Product Details

MODICON AS-S908-110 is a single-channel S908 remote I/O adapter and bus controller designed exclusively for the Modicon 984 rack PLC platform. This distributed gateway acts as the communication master for the S908 remote I/O bus, linking the central host CPU to multiple distributed remote I/O drops placed near field sensors and actuators. It transmits output commands from the main controller out to remote racks and uploads real-time input status and diagnostic data back through the coaxial S908 bus, greatly reducing long multi-core field wiring and simplifying layout for large automation systems. The module inserts into a single slot of the Modicon dedicated backplane and exchanges cyclic data with the host processor over the internal rack bus. Front-mounted LED indicators display power status, bus activity, drop faults and communication timeouts so maintenance technicians can rapidly isolate bus failures or offline remote stations on site. Built-in EMI filtering and surge suppression circuits protect the coaxial bus port against voltage spikes and electromagnetic interference produced by inverters, contactors and heavy power cables on the production floor. It supports standard S908 bus timing and termination rules, and remote drop addresses are configured through PLC programming software. As a discontinued industrial spare part, this remote I/O adapter is essential for sustaining legacy distributed control systems. Direct drop-in replacement keeps the existing bus cabling, remote drop assignment and PLC control program unchanged, minimizing commissioning work and cutting production downtime.

Basic Parameters

Product type: S908 remote I/O adapter module

Part number: AS-S908-110

Brand: Modicon, Schneider Electric

Compatible controller: Modicon 984 series rack PLC

Bus type: single channel S908 remote I/O bus

Media: coaxial cable

Mounting: single slot plug-in for Modicon backplane

Weight: 1.36 kg

Max altitude: 1000 m without derating

Operating temperature: 0°C ~ +40°C

Protection grade: IP20

Supported Functions

Cyclic data exchange between host CPU and remote I/O drops

Bus scheduling and communication supervision for S908 network

Remote input collection and remote output refresh

Drop fault detection and communication timeout flagging

Backplane high-speed data transfer with main processor

Noise filtering and surge protection for coaxial bus lines

Core Functions

Serve as a reliable remote I/O adapter for legacy distributed systems

Visual LED indication for fast bus and drop troubleshooting

Act as a dedicated bus controller for the S908 field network

Reduce field wiring by distributing I/O to local remote racks

Modular expansion of control points for Modicon 984 PLC

Stable gateway operation for continuous process automation

Hardware Specifications & Environmental Features

Circuit design: integrated EMI filter and bus surge protection

Storage temperature: -25°C ~ +70°C

Relative humidity: 5% to 80% non-condensing

Condition: obsolete original spare part, available stock

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 Modicon 984 backplane compatibility, bus termination and remote drop address assignment before ordering.

This is from our current stock.

available stock.xlsx