Technical Overview
The ALR111-S50 is a dual-port serial communication module for the Yokogawa CENTUM VP DCS. Designed for RS-232C connections, it integrates external subsystems—such as PLCs, analyzers, and specialized field instruments—into the control system, enabling bidirectional data exchange and reliable process monitoring.
Detailed Specifications
| Item | Specification |
|---|---|
| Module Type | Serial Communication Interface |
| Model Number | ALR111-S50 |
| Number of Ports | 2 (Independent configuration) |
| Transmission Speed | 300 bps – 115.2 kbps |
| Maximum Cable Length | 15 m (Standard RS-232 limitation) |
| Protocols Supported | Modbus RTU (Master/Slave), Non-procedure |
| Connector Type | D-sub 9-pin (Male) |
| Power Consumption | 0.5 A at 5 VDC |
| Operating Temperature | 0°C to +50°C |
| Weight | 0.3 kg |
Operational Capabilities
-
Supports independent configuration of two ports for simultaneous communication with different devices
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Ideal for Modbus Master applications for polling remote terminal units (RTUs)
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Supports redundant configurations: two modules can operate in tandem for uninterrupted communication in critical applications
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Provides hardware flow control (RTS/CTS) for stable data transfer with legacy devices
Technical FAQ
What is the difference between ALR111 and ALR121?
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ALR111: RS-232C (short distance, point-to-point)
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ALR121: RS-422/RS-485 (longer distance, multi-drop)
Can this module be used for Modbus TCP/IP?
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No. ALR111-S50 is strictly serial RS-232C. Use ALE111 or other Ethernet modules for Modbus TCP/IP.
Does the module support hardware flow control?
-
Yes, it supports RTS/CTS signals for reliable communication with legacy peripherals.
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