S-093H: Product OverviewThe S-093H is a Network Interface Module (NIM) for ABB’s (formerly Bailey Controls) INFI 90 distributed control system. This module serves as the critical communication gateway between a local process control unit (PCU) and the plant-wide INFI-NET data highway. Installed in a slot within the INFI 90 PCU, its primary function is to manage the bidirectional exchange of data, allowing the central operator stations and engineering workstations to communicate with the controllers and I/O modules within the PCU. It enables real-time data transmission for monitoring, control, and configuration across the distributed system architecture.The module implements the proprietary INFI-NET protocol, a deterministic token-passing network designed for high reliability in industrial environments. It features dual-ported memory architecture, allowing the module’s microprocessor to manage communications with the INFI-NET while simultaneously providing the main controller within the PCU (typically a Master Module) access to the network data. This design ensures that process control scanning is not interrupted by network traffic, maintaining the deterministic performance required for real-time control applications.
ABB S-093H
S-093H: Technical Specifications
•• Model Number: S-093H
•• Manufacturer: ABB (Bailey Controls)
•• Product Type: Network Interface Module (NIM)
•• Compatible System: INFI 90 Distributed Control System (DCS)
•• Network Protocol: INFI-NET
•• Data Transfer Rate: 10 Megabits per second (Mbps)
•• Network Topology: Ring (via twisted pair or fiber optic media)
•• Module Slot: Requires a specific slot in the INFI 90 PCU (typically slot 1)
•• Power Requirement: +5 VDC from the PCU backplane
•• Status Indicators: LED indicators for power, network status, and activity
•• Addressing: Module address set via rotary switches on the front face
•• Memory: Dual-ported memory for communication buffering
ABB S-093H
Core Features & Customer ValueThe module’s primary value lies in enabling the distributed architecture of the INFI 90 system. By providing a high-speed, deterministic link to the operator interface, it allows for centralized monitoring and control of geographically dispersed process units. For operators and engineers, this means a unified view of the entire plant process from the control room, enabling coordinated control strategies and efficient response to process upsets. The deterministic nature of the INFI-NET protocol ensures that critical process data and alarms are delivered with predictable timing, which is essential for safe and efficient plant operation.The dual-ported memory architecture is a critical design feature that decouples the network communication tasks from the primary control processing. This ensures that the controller’s scan cycle, which is responsible for executing control logic and processing I/O, remains consistent and is not adversely affected by fluctuations in network traffic. For control engineers, this guarantees the reliability and performance of the control loops, which is the foundation of process stability and product quality.Typical ApplicationsIn a fossil fuel power plant, multiple INFI 90 PCUs, each with an S-093H module, are deployed to control the boiler, turbine, and balance-of-plant systems. The S-093H modules in each PCU connect to the plant-wide INFI-NET ring, allowing operators in the central control room to monitor combustion conditions, adjust turbine speed, and control feedwater systems from a single integrated interface.In a large chemical complex, the S-093H facilitates communication between PCUs controlling individual process units—such as reaction, distillation, and storage—and the central operating station. This enables plant-wide optimization, data logging, and coordination of batch sequences across different production areas.
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