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Description
The Schneider Electric ASS908022 is a dedicated S908 Remote I/O Processor module designed for integration within Modicon 984 and Quantum PLC backplane environments. This module serves as a critical communication interface, managing deterministic data exchange between the central processor and distributed I/O drops. It is specifically engineered to maintain high-speed, reliable communication in demanding industrial sectors, including power generation, mining, and petrochemical processing, where signal integrity and network uptime are essential.
Features
- Supports deterministic token-passing communication protocols for real-time I/O scanning.
- Enables redundant network architecture with automatic switchover between dual coaxial channels (Channel A/B) in the event of a fault.
- Provides galvanic isolation to shield sensitive backplane logic from electromagnetic interference and transient surges.
- Integrates directly into existing Modicon 984 and Quantum rack structures.
- Facilitates advanced diagnostics for line fault tracking and communication drop isolation.
Applications
This module is typically utilized in large-scale distributed control systems where remote I/O stations are spread across wide geographical areas. It is suitable for continuous process control applications that require redundant communication paths to prevent system downtime during cable failures or signal degradation.
Technical Specifications
| Model |
ASS908022 (S908 022) |
| Brand |
Schneider Electric |
| Network Interface |
Dual BNC (Channel A and Channel B) |
| Transmission Rate |
1.544 Mbps |
| Media Type |
75 Ohm RG-6 / RG-11 Coaxial |
| Max Drop Capacity |
32 Remote Stations |
| Max Network Distance |
4500 m (with repeaters) / 1500 m (point-to-point) |
| Power Consumption |
850 mA at 5 VDC (backplane powered) |
| Operating Temperature |
0 to 60 deg C |
| Storage Temperature |
-40 to 85 deg C |
Installation Guidelines
- Ensure the PLC chassis is powered down before inserting or removing the module to prevent electrical damage.
- Verify that the backplane slot is clean and free of debris before seating the module.
- Use high-quality 75 Ohm coaxial cable and proper BNC termination to maintain signal integrity over long distances.
- Maintain proper grounding of the coaxial shield at designated points to minimize EMI/RFI impact.
- Ensure adequate ventilation around the rack to maintain operating temperatures within the specified 0-60 deg C range.
FAQ
What is the primary function of the ASS908022 module?
It acts as a communication processor that manages the S908 remote I/O network, mapping remote I/O registers directly into the main controller's memory for deterministic data handling.
Does this module support redundant communication?
Yes, it supports a dual-channel coaxial configuration, allowing the system to automatically switch between Channel A and Channel B within a single network scan cycle if a fault is detected.
Can this module be used with Quantum series controllers?
Yes, the ASS908022 is compatible with both Modicon 984 and Quantum backplane architectures.
