ALR121-S01 Yokogawa Centum Series Datasheet & Technical Manual

Yokogawa ALR121-S01 series field control communication module

Yokogawa ALR121-S01 series field control communication module

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YOKOGAWA ALR121-S01 Serial Communication Module Configured for serial data exchange within CENTUM VP and ProSafe-RS control networks, the YOKOGAWA ALR121-S01...

رمز المنتج: ALR121-S01

Manufacturer: Yokogawa
Product No.: ALR121-S01
Product Type: Communication Modules
Product Origin: Japan
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

وصف التقييمات

YOKOGAWA ALR121-S01 Serial Communication Module

Configured for serial data exchange within CENTUM VP and ProSafe-RS control networks, the YOKOGAWA ALR121-S01 (ALR121 Serial Communication Module) provides direct physical and electrical execution of RS-422/RS-485 communication protocols between Field Control Stations (FCS) and peripheral field devices.

Hardware Specifications

Parameter	Specification
Model	ALR121-S01
Brand	Yokogawa
Origin	Singapore
Weight	0.3 kg
Dimensions	126.7 x 32.8 x 130 mm
Operating Temp	-20 deg C to +60 deg C
Power Consumption	< 5 W
Interface	RS-422 / RS-485

Process Control and Communication Connectivity

The ALR121 module facilitates integration with field control stations, supporting diverse protocol suites including Modbus, MELSEC-A, and YS instrument communication. The unit architecture enables high-integrity data transfer, supporting both point-to-point and multipoint communication architectures. To ensure process continuity, the system allows for dual-redundant module configuration, which provides automatic switchover capabilities in the event of primary channel failure. The module maintains signal integrity through channel-to-channel isolation and robust EMI resistance, which is standard for high-density Yokogawa DCS environments. Operators must ensure correct termination at the terminal block to maintain impedance matching for the 1200 m maximum transmission distance.

Frequently Asked Questions

Q: Can the ALR121 support simultaneous communication protocols on both ports?

A: Yes, the ALR121 allows for independent protocol configuration on its dual ports. Each port can be assigned specific communication definitions, provided the total number of definitions does not exceed the module capacity constraints set by the connected FCS.

Q: How is the redundancy switchover managed when using dual modules?

A: Redundancy is managed by the Field Control Station (FCS). When the primary module experiences a hardware heartbeat loss or communication timeout, the FCS automatically switches process data polling to the secondary module without requiring operator intervention.

Field Installation Guidelines

Mounting: Seat the module firmly into the designated slot on the node unit backplane. Engage the top and bottom locking levers to ensure high-pressure contact with the module bus connectors.
Wiring: Use shielded twisted-pair cabling for RS-485/RS-422 signals. Connect the cable shield to the designated functional ground terminal on the module interface plate to mitigate electromagnetic noise.
Termination: For long-distance multipoint segments, install 120 Ohm termination resistors at both ends of the RS-485 transmission line to prevent signal reflections.
Configuration: Utilize the Centum VP engineering workstation to assign the correct port parameters, baud rate, and parity settings. Verify the physical link status LEDs on the module front panel after initialization.

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