YOKOGAWA DUAL LAYER ST5A AS S9221AQ-0 S9771AJ-0 PLC MODULE SAVE$

Description:

The Yokogawa ST5*A PLC Module Card AS-S9221AQ-0 / S9771AJ-0 is used in distributed control systems for internal control processing and signal interface within PLC/DCS architectures. Commonly installed in Yokogawa control racks and industrial automation cabinets for system operation and signal handling. Maintenance teams and system integrators use this part for replacing legacy control boards, repairing PLC systems, or maintaining reliable processing and communication in process control systems.

Applications:

The Yokogawa ST5*A module is commonly used in industrial automation environments where control logic execution and internal signal interfacing are required. It is frequently applied in oil & gas, chemical plants, and manufacturing systems to support process control operations and interface with I/O modules. Control boards like this act as internal processing or interface layers within legacy Yokogawa PLC and DCS systems, ensuring coordinated system operation.

Technical Specifications:

• Manufacturer: Yokogawa
• Model / Part Number: ST5*A / AS-S9221AQ-0 / S9771AJ-0
• Product Type: PLC Module Card / Control Board
• Function: Control processing and signal interface within PLC/DCS systems
• System Compatibility: Yokogawa PLC and CENTUM DCS systems
• Construction: Dual-layer PCB design (control board architecture)
• Installation: Rack-mounted plug-in card within control cabinets
• Role: Supports system control, signal routing, and internal communication
• Application: Industrial process automation and control systems
• Form Factor: Plug-in module card
• Availability: Surplus / refurbished / legacy component

Common Replacements:

• Yokogawa EA9A Interface Card
• Yokogawa EA1A Signal Interface Module
• Yokogawa AIP413 Control Module