Technical Overview
The ALR121-S50 S1 is a serial communication interface module for Yokogawa CENTUM VP and ProSafe-RS systems. It enables deterministic data exchange between the DCS and external subsystems such as PLCs, MCCs, VFDs, and analytical instruments that communicate via serial protocols.
Supporting RS-422 and RS-485, the module allows reliable integration of multi-drop serial networks into the Yokogawa control architecture, extending monitoring and control capabilities beyond native Ethernet or Vnet/IP devices.
Detailed Specifications
| Item | Specification |
|---|---|
| Module Type | Serial communication interface |
| Model Designation | ALR121-S50 S1 |
| Hardware Style | Style 1 (S1) |
| Supported Protocols | RS-422, RS-485 |
| Communication Methods | Modbus RTU (Master/Slave), non-procedure communication |
| Number of Ports | 2 (independently configurable) |
| Max Transmission Speed | 115.2 kbps per port |
| Max Communication Distance | Up to 1200 m (shielded twisted pair) |
| Power Consumption | 0.5 A @ 5 VDC |
| Dimensions (W × H × D) | 22 × 124 × 126 mm |
| Net Weight | 1.5 kg |
Application
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Integration of third-party serial devices into CENTUM VP
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Communication with PLCs, MCCs, VFDs, power meters, analyzers
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Modbus RTU–based data acquisition and control
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Legacy system integration where Ethernet/Vnet/IP is unavailable
Connectivity & Deployment
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Installed in FIO node units
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Converts serial register data into control system I/O points
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Dual ports support:
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Redundant serial links
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Two independent device networks
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S50 suffix denotes enhanced hardware/firmware suitability for long-term operation in harsh or corrosive environments
Technical FAQ
Does the ALR121-S50 S1 support Modbus RTU?
Yes. It is commonly used for Modbus RTU, supporting both Master and Slave operation with devices such as VFDs and energy meters.
Can each port use a different serial standard?
Yes. Each port is independently configurable, allowing combinations such as RS-422 on Port 1 and RS-485 on Port 2.
Is Style 1 (S1) compatible with newer CENTUM VP versions?
The ALR121-S50 S1 is a legacy-stable module compatible with many CENTUM VP releases. Always confirm compatibility against your system software revision.
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