Product Description
The ALR121-S50S1 is a high-performance serial communication module developed for the Yokogawa CENTUM VP Distributed Control System (DCS). It enables seamless integration of third-party subsystems—such as PLCs, motor control centers (MCCs), protection relays, and analyzers—into the unified CENTUM control environment.
Supporting both RS-422 and RS-485 physical layers, the ALR121-S50S1 accommodates complex multi-drop network topologies and long-distance communication links. By offloading serial communication processing from the main Field Control Unit (FCU), it ensures that time-critical control loops remain unaffected by heavy data traffic.
The module supports Modbus RTU and other serial communication protocols, enabling bidirectional data exchange for real-time monitoring, alarm reporting, and remote setpoint control. It is widely used as a communication gateway for consolidating distributed field data into centralized Yokogawa HMI and supervisory systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Interface Standard | Dual-port RS-422 or RS-485 (software selectable) |
| Protocol Support | Modbus RTU, PC Link, general-purpose serial communication |
| Isolation | Channel-to-system isolation |
| Maximum Baud Rate | Up to 115.2 kbps |
| Transmission Distance | Up to 1200 m (RS-485 differential signaling) |
| Slot Occupancy | Single slot on standard I/O node base |
| Power Consumption | 5 V DC internal logic |
| Operating Temperature | 0 to 55°C |
| Dimensions (W × H × D) | 22 mm × 124 mm × 126 mm |
| Shipping Weight | 1.5 kg |
Application
The ALR121-S50S1 is commonly deployed in:
-
Oil & gas production facilities (flow computers, RTUs)
-
Power generation plants (protection relays, turbine controllers)
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Chemical and petrochemical installations
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Integrated plant-wide automation requiring third-party device connectivity
It is particularly suited for applications where disparate field devices must be integrated into a centralized Yokogawa DCS architecture for monitoring and supervisory control.
Technical FAQ
Does the ALR121-S50S1 support dual-redundant configurations?
Yes. In high-availability systems, two modules can be configured redundantly. If the primary communication path fails, the standby module takes over to maintain continuous data exchange.
How are termination resistors handled for RS-485 networks?
The module includes configurable internal termination settings. These can be enabled via hardware switches or software parameters to ensure signal stability and prevent reflections on long cable runs.
| Quick Quotes | Receive price & availability FAST from our dedicated customer service team. |
|---|---|
| Delivery | Expedited, Freight, And International Shipping Available. |
| Condition | 100% New with Original Package |
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
| Q: Is Our Pricing Competitive? |
| A: Yes, we collaborate with over 50 countries worldwide. As a top supplier in China, we offer significant discounts based on market trends. |
| Q: What Is the Warranty Period? |
| A: All our new and original products come with a standard one-year warranty. |
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