Yokogawa ALR121-S00 S1 Serial Communication Module The Yokogawa ALR121-S00 S1, also cataloged as the ALR121 Serial Communication Module, operates as...
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Description
Yokogawa ALR121-S00 S1 Serial Communication Module
The Yokogawa ALR121-S00 S1, also cataloged as the ALR121 Serial Communication Module, operates as a dedicated hardware component for serial data exchange via RS-422, RS-485, and RS-232C interfaces within CENTUM VP and CENTUM CS 3000 distributed control systems.
Hardware Specifications
Parameter
Specification
Brand
Yokogawa
Origin
Japan
Weight
Approx. 0.30 kg
Dimensions
Not specified in source documentation
Operating Temp
0 to 50 degC (32 to 122 degF)
Power Consumption
Max. 0.5 A at 5 V DC
Number of Ports
2 (Port 1, Port 2)
Interface Standards
RS-422, RS-485 (2-wire/4-wire), RS-232C (software selectable per port)
This module supports deterministic communication performance through CENTUM VP backplane bus integration, maintaining consistent data throughput for connected subsystems. Each port operates with independent electrical isolation characteristics, preventing ground loop formation when interfacing with heterogeneous field instrumentation. The hardware complies with standard 4-20 mA loop signaling conventions where applicable in hybrid analog-digital architectures, ensuring compatibility with existing process measurement devices.
Frequently Asked Questions
Q: Does the ALR121-S00 S1 support hot-swapping without interrupting DCS operations?
A: Yes. The module can be replaced online without powering down the station, provided the redundant configuration is active to maintain bumpless operation.
Q: What is the maximum cable length supported for RS-485 connections?
A: The module supports up to 1200 meters for RS-422/485 links, depending on cable quality and network topology.
Q: Are both ports independently configurable for different serial standards?
A: Yes. Each port can be individually set to RS-422, RS-485, or RS-232C via software configuration.
Field Installation Guidelines
Mount the module into the designated CENTUM VP or CS 3000 I/O slot using correct ESD precautions. Use shielded twisted-pair cabling for RS-422/485 connections, grounding the shield at one end only to minimize noise pickup. Maintain separation from high-voltage power wiring to prevent electromagnetic interference. Verify termination resistor settings according to the connected device specifications before energizing the system.
