Specialized I/O Management for Distributed Control Architectures
The Schneider Electric AS-S908-110 is a dedicated I/O processor for the Modicon 984 series. This module specializes in managing input and output tasks within a distributed control system. It facilitates communication through a reliable single-channel remote I/O setup. Consequently, it enables seamless integration and expansion for legacy Modicon 984 PLC systems.
Technical Specifications and Environmental Ratings
This robust processor from Schneider is designed for industrial environmental conditions. Its compact form factor allows for flexible mounting in control panels or remote enclosures. Furthermore, the module maintains reliable performance across a specified temperature and humidity range.
Detailed Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model Number | AS-S908-110 |
| Product Series | Modicon 984 |
| Product Category | Remote I/O Processor / I/O Scanner Module |
| Primary Function | Remote I/O Communication and Management |
| Compatibility | Modicon 984 Programmable Logic Controllers (PLCs) |
| Communication Channel | Single Channel Remote I/O (S908 Protocol) |
| Supported I/O Capacity | Dependent on connected remote drops and chassis |
| Module Dimensions (H x W x D) | 10.2 cm x 3.8 cm x 3.8 cm |
| Module Weight | 3.00 lbs (1.36 kg) |
| Operating Temperature Range | 0°C to 40°C |
| Storage Temperature Range | Similar to operating range (datasheet specific) |
| Relative Humidity (Operating) | Up to 80% (Non-condensing) |
| Relative Humidity (Storage) | Up to 80% (Non-condensing) |
| Maximum Operating Altitude | 1000 meters above sea level (without derating) |
| Power Supply Requirements | 5V DC from Modicon 984 baseplate (typical) |
| Communication Interface | Proprietary S908 remote I/O network port |
| Status Indicators | LEDs for Power, Communication Status, Fault |
| Internal Energy Storage | None; volatile memory may have capacitor backup |
| Processor Speed / Memory | Sufficient for real-time I/O scanning (984-specific) |
| Electrical Isolation | Between network and logic side (typical) |
| Mounting | Installs into a designated slot on a Modicon 984 rack |
Key Features and System Role
The AS-S908-110 acts as a communication gateway between the central 984 CPU and remote I/O drops. It scans the remote I/O chassis and updates the PLC’s memory map efficiently. This architecture allows the main processor to be located far from the actual field devices. Moreover, its single-channel design provides a cost-effective solution for many distributed applications. This makes it essential for plant-wide systems where I/O is scattered across a large area.
Application Context and Legacy Integration
This module is key for modernizing or extending existing Modicon 984 control systems. It is commonly used in industries like water/wastewater, manufacturing, and building automation. The AS-S908-110 connects to remote chassis such as the 800 Series I/O via coaxial cable. Its reliable performance ensures continuous data exchange in demanding environments. Therefore, it preserves the investment in legacy 984 infrastructure while enabling distributed control.
Installation and Network Configuration
Installation requires inserting the module into an available slot on the 984 main or expansion rack. Technicians must connect the S908 coaxial cable from the processor to the first remote drop. Configuration typically involves setting station addresses on the remote chassis via DIP switches. Furthermore, proper cable termination at both ends of the network is critical for communication integrity.
Details
| Weight | 0.91 kg |
|---|---|
| Dimensions | 110 × 55 × 90 mm |
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