Features:
- Enables communication with distributed I/O drops over a single-channel remote network
- Seamlessly compatible with legacy Modicon 984 PLCs and 800 Series I/O chassis
- Designed for standard operating temperatures (0°C to 40°C) and humidity up to 80% RH
The AS-S908-110 serves as the master node for a Remote I/O (RIO) network, which is a critical architecture for large-scale industrial control systems . It initiates all messages on the network and communicates with RIO adapters located at remote drops . This allows the central PLC to be physically distant from the field I/O, enabling control systems to be distributed across large manufacturing or processing facilities . The single-channel design provides a cost-effective solution for managing distributed I/O.
This module is designed to integrate seamlessly with legacy Modicon 984 Programmable Logic Controllers (PLCs) . It acts as a dedicated I/O scanner or processor, managing the communication between the 984 CPU and the remote I/O drops . This compatibility makes the AS-S908-110 an essential component for extending the life of older Modicon 984 systems, allowing plants to preserve their investment in existing control infrastructure while enabling distributed I/O architectures.
The AS-S908-110 is built to withstand the typical conditions of an industrial control cabinet . It has an ambient operating temperature range of 0 to 40 degrees Celsius and can operate in environments with relative humidity up to 80% (non-condensing) . The module can be installed at altitudes up to 1000 meters without derating, which is a standard specification for industrial equipment . This ensures reliable operation in a wide range of factory floor conditions.
The AS-S908-110 Schneider Remote I/O Processor may still be available for purchase and support from Apter Power beyond
End-Of-Life (EOL) by the manufacturer (OEM).
Schneider AS-S908-110 Remote I/O Processor Manuals,
Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not
included with this equipment unless listed in the above stock item description. All prices are
shown in USD.
Schneider AS-S908-110 Remote I/O Processor Specs
General
- Manufacturer Schneider
- Model AS-S908-110
- Condition New Original ready stock
- Product Family
R911 AS-S911-003,AS-S908-120,AS-P890-000
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not
included with this equipment unless listed in the above stock item description. All prices are
shown in USD.
- Metals and Mining: Controlled massive blast furnaces, raw material conveyors, and heavy rolling mills where I/O stations were distributed across vast physical plants.
- Water and Wastewater: Monitored decentralized pumping stations, deep wells, and large-scale clarifiers located far from the central control room.
- Chemical Plants and Oil Refineries: Managed remote valve manifolds, storage tank farms, and mixing stations where long-distance, noise-immune coaxial cabling was required.
- Automotive Assembly Lines: Synchronized multiple production cells, welding robots, and assembly sub-stations under a single master PLC.
- UV-EPROM Chips: The firmware on this module is stored physically on UV-EPROM (Erasable Programmable Read-Only Memory) microchips soldered or socketed onto the internal circuit board.
- Firmware Updates: There is no software tool or firmware file you can download to flash this device over a cable. Updating the firmware requires a physical hardware swap. You must open the plastic casing, pull out the old memory chip using a chip extractor tool, and insert a new chip that has been pre-programmed with a specialized hardware burner.
- Revision Compatibility: When sourcing a replacement AS-S908-110 module from the spare-parts market, it is critical to match the revision letter/number (e.g., Rev A, Rev B) stamped on the side sticker. Mixing incompatible chip revisions can cause unexpected system faults or communication timing mismatches with your 984 CPU.
- Rotary/DIP Switches: The module features physical micro-switches on the backplane or side panel. These switches are used to set the specific Network Address and drop numbers it is responsible for polling.
- Network Termination: Since the S908 network runs on a 1.544 Mbps coaxial backbone, you must place physical 75-ohm BNC terminators at the end of the cable run to stop signal echo from breaking communication.
- Traffic Cop Allocation: Within the software, you open the hardware configuration matrix, historically known as the "Traffic Cop".
- Memory Mapping: In the Traffic Cop, you tell the PLC CPU exactly which remote 800-series I/O modules are sitting on the remote drops managed by the AS-S908-110. For example, you map "Remote Drop 1, Slot 3" to a specific Modbus register range (like 00001 for digital outputs or 30001 for analog inputs).