Schneider AS-S908-110
Schneider AS-S908-110
Schneider AS-S908-110
Schneider AS-S908-110
Schneider AS-S908-110
Schneider AS-S908-110
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AS-S908-110

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The Schneider AS-S908-110 is a Remote I/O Processor for Modicon 984 PLCs, managing distributed I/O via single-channel remote communication.
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Technical specifications for AS-S908-110

  • Manufacturer:
    Schneider Electric
  • Part Number:
    AS-S908-110
  • Product Family:
    Modicon 984 series
  • Product Type:
    Remote I/O Processor
  • Stock:
    4
  • Power Supply:
    5V DC from Modicon 984 baseplate (typical)
  • Max Power Consumption:
    15 W
  • Operating Temperature:
    0°C to 40°C
  • Storage Temperature:
    -40°C to 85°C
  • Relative Humidity (Operating):
    Up to 80% (non-condensing)
  • Maximum Operating Altitude:
    1000 meters (without derating)
  • Weight:
    1.12 kg
  • Estimated shipping dimensions:
    5.4x21.3x26.5cm
  • Tariff Code:
    8538900000
  • Country of origin:
    France
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Firmware and Updates Configuration

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).
Description
The Schneider Electric AS-S908-110 is a dedicated Remote I/O Processor module from the Modicon 984 series. Its primary role is to manage input and output tasks within a distributed control architecture, facilitating communication between a central PLC and remote I/O drops scattered across a facility.

The AS-S908-110 operates via a single-channel remote I/O setup, utilizing the proprietary S908 protocol over coaxial cable . This design allows the main processor to be located far from field devices, making the AS-S908-110 a cost-effective solution for plant-wide systems where I/O is distributed over a large area.

The Schneider AS-S908-110 is built for industrial environments, operating within a temperature range of 0 to 40 degrees Celsius and supporting humidity up to 80% RH (non-condensing) . It is typically powered by the 5V DC supply from the Modicon 984 baseplate and features status LEDs for power, communication status, and fault indication.

This module is essential for modernizing or extending existing Modicon 984 control systems, preserving the investment in legacy infrastructure while enabling distributed control . The AS-S908-110 is widely used in industries such as water/wastewater, manufacturing, and building automation.
Alternative Names
AS-S9O8-11O AS-S908-II0 AS S908 110 R911 AS-S911-003 AS-P890-000 AM-SA85-000 AS-S908-120 PC-E984-685
Technical notes
The Schneider AS-S908-110 is a Remote I/O Processor for Modicon 984 PLCs. It manages distributed I/O via a single-channel S908 network.It communicates over coaxial cable and is compatible with 800 Series I/O.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the primary function of the AS-S908-110?
It acts as a Remote I/O Processor, managing communication between a Modicon 984 PLC and distributed remote I/O drops.
What is the operating temperature of the AS-S908-110?
It operates in ambient temperatures ranging from 0°C to 40°C.
What is the communication protocol of the AS-S908-110?
It uses the proprietary S908 single-channel remote I/O protocol over coaxial cable.

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