The Yokogawa ALR121-S51 is a professional-grade serial communication module designed for the CENTUM VP and CS 3000 Distributed Control Systems (DCS). This module features dual RS-232C ports, providing a dedicated hardware interface for connecting Field Control Stations (FCS) to various subsystem devices. It excels at collecting data from PLCs, power monitors, and analytical instruments, storing the information in an internal I/O image area for high-speed, asynchronous access by the control system’s processor.\
Technical Specifications
| Feature | Specification Details |
| Manufacturer | Yokogawa Electric Corporation |
| Model Number | ALR121-S51 |
| Interface Port | RS-232C (D-sub 9-pin) |
| Number of Ports | 2 |
| Transmission Speed | Up to 115.2 kbps |
| Communication Distance | Maximum 15 meters |
| System Compatibility | CENTUM VP / CS 3000 FIO System |
| Operating Temperature | -20 to 60°C |
| Weight | 0.30 kg |
| Dimensions | 3.2 x 13.0 x 14.0 cm |
Key Application Areas
- PLC Integration: Interfacing with Modbus-RTU compatible PLCs for coordinated control.
- Power Management: Monitoring data from digital protective relays and power meters.
- Analytical Systems: Connecting gas chromatographs and liquid analyzers to the DCS operator stations.
- Legacy Subsystems: Bridging existing serial-based industrial hardware with modern DCS networks.
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