Description
Product Overview
The ALR121-S51 Serial Communication Module from Yokogawa enhances safety and reliability in distributed control systems. This SIL3-certified module supports serial communication networks by storing subsystem data in dedicated I/O image areas. Engineers use the ALR121-S51 to ensure fail-safe operation while Field Control Systems (FCS) access real-time data asynchronously.
Its redundant relay contacts and robust design maintain performance across industrial temperatures from -20°C to 60°C. The ALR121-S51 features LED indicators for real-time diagnostics and mounts easily on DIN rails, streamlining installation in control cabinets. TÜV certification and global compliance make it ideal for safety-critical applications.
Technical Specifications
| Specification |
Details |
| Model Number |
ALR121-S51 |
| Manufacturer |
Yokogawa |
| Module Type |
Serial Communication Module |
| System Compatibility |
DCS |
| Communication |
Serial + Ethernet Router |
| Safety Compliance |
SIL3, TÜV, ATEX, IECEx |
| Relay Contacts |
Redundant |
| Diagnostics |
LED Status Indicators |
| Mounting Type |
DIN-Rail |
| Operating Temp. |
-20°C to 60°C |
| Dimensions |
14 × 13 × 3.2 cm |
| Weight |
0.3 kg |
| HS Code |
8537101190 |
| MOQ |
1 |
| Origin |
Japan |
| Condition |
Brand New |
| Availability |
In Stock |
Key Features
-
Stores subsystem data in I/O image areas for asynchronous FCS access.
-
Ensures fail-safe operation with redundant relay contact design.
-
Supports unified analog/digital I/O and safety signals.
-
LED indicators provide instant visual diagnostics.
-
Operates reliably in harsh industrial environments.
Applications & Compatibility
The ALR121-S51 integrates with Yokogawa’s CENTUM VP and other DCS platforms. It supports emergency shutdown systems, burner management, and safety-critical automation in oil & gas, chemical, and power sectors. Use the ALR121-S51 to bridge serial communication with high-integrity control strategies.
