ALR121-S00 YOKOGAWA Serial Communication Module

YOKOGAWA ALR121-S00 RS-422/RS-485 Serial Communication Module

YOKOGAWA ALR121-S00 RS-422/RS-485 Serial Communication Module

Availability: 99 left in stock

YOKOGAWA ALR121-S00 Communication Module Configured for serial data exchange in CENTUM VP FIO subsystems, the YOKOGAWA ALR121-S00 S1 (ALR121-S00 S1...

SKU: ALR121-S00 S1

Manufacturer: Yokogawa
Product No.: ALR121-S00 S1
Product Type: Serial Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 1500g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

YOKOGAWA ALR121-S00 Communication Module

Configured for serial data exchange in CENTUM VP FIO subsystems, the YOKOGAWA ALR121-S00 S1 (ALR121-S00 S1 Serial Communication Module) provides direct physical/electrical execution of RS-422 and RS-485 signaling.

Hardware Specifications

Parameter	Specification
Model	ALR121-S00 S1
Brand	YOKOGAWA
Origin	Indonesia
Weight	1.5 kg
Dimensions	2.2 cm x 12.4 cm x 12.6 cm
Operating Temp	0 to 50 deg C
Power Consumption	0.6 A at 24 V DC
Protocol Support	RS-422 / RS-485
Channel Density	2 ports

DCS Process Control and Serial Connectivity

The ALR121-S00 module facilitates asynchronous serial communication between the Field Control Unit (FCU) and peripheral subsystems such as gas chromatographs, analyzers, or third-party programmable controllers. The module incorporates advanced channel-to-channel isolation to prevent ground loops that typically occur in long-distance RS-485 multidrop networks. By implementing 4-20 mA HART loop protocol compatibility on adjacent analog sub-systems, this module serves as a bridge for complex instrument data. Its design maintains deterministic data exchange through standard serial communication protocols, ensuring that process variables and diagnostic status bits are updated within the cycle timing of the CENTUM VP control bus.

Frequently Asked Questions

Q: Does the ALR121-S00 module support Modbus RTU communication protocols?

A: Yes, the module is designed to support standard serial protocols, including Modbus RTU, allowing integration with diverse industrial instrumentation that utilizes RS-422 or RS-485 physical layers.

Q: Is it possible to configure this module for point-to-point RS-422 communication?

A: Yes, the module ports are software-configurable to operate in either RS-422 four-wire mode or RS-485 two-wire multidrop mode, depending on the requirements of the connected field device.

Q: What is the maximum cable length recommended for RS-485 communication?

A: For RS-485 networks, the maximum cable length is generally 1200 meters, provided that high-quality shielded twisted-pair cabling is used and correct line termination resistors are installed at both ends of the segment.

Field Installation Guidelines

Mount the module into the designated slot of the FIO node interface unit, ensuring the module connector fully seats into the backplane. Maintain an operating environment within the 0 to 50 deg C range. When connecting serial devices, utilize high-quality shielded twisted-pair cabling to minimize signal distortion. Connect the shield drain wire to the designated signal ground terminal to ensure effective noise rejection. Avoid running serial communication cables parallel to high-voltage power lines to prevent induced interference. Verify the correct switch or software configuration for baud rate, parity, and stop bits before initiating communication with the field device.

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