CP332D Yokogawa CENTUM VP Datasheet & Technical Manual

ALR121-SE1-S1 RS-422/RS-485 Yokogawa Serial Communication Module

ALR121-SE1-S1 RS-422/RS-485 Yokogawa Serial Communication Module

Availability: 10 left in stock

YOKOGAWA ALR121-SE1-S1 Serial Communication Module The YOKOGAWA ALR121-SE1-S1, also cataloged as the ALR121 RS-422/RS-485 module, operates as a dedicated hardware...

SKU: ALR121-SE1

Manufacturer: Yokogawa
Product No.: ALR121-SE1
Product Type: Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

YOKOGAWA ALR121-SE1-S1 Serial Communication Module

The YOKOGAWA ALR121-SE1-S1, also cataloged as the ALR121 RS-422/RS-485 module, operates as a dedicated hardware component for serial data exchange between Field Control Stations (FCS) or Safety Control Stations (SCS) and external subsystems within DCS networks.

Hardware Specifications

Parameter	Specification
Model	ALR121-SE1-S1
Brand	Yokogawa
Origin	Japan
Weight	0.30 kg
Dimensions	7.7 cm x 4.2 cm x 10.6 cm
Operating Temp	Standard DCS environment
Power Consumption	0.5 A
Interface	RS-422 / RS-485
Transmission Speed	1200 to 38400 bps
Max Distance	1200 m

Process Control and Communication Connectivity

The ALR121-SE1-S1 module executes data transmission via half-duplex, start-stop synchronization for seamless integration with third-party PLCs and intelligent field instruments. It provides critical channel-to-channel isolation to protect the internal DCS backplane from external electrical surges common in multi-point RS-485 serial networks. By supporting configurable parity, character length, and stop-bit settings, the module enables precise protocol matching for Modbus RTU or proprietary serial subsystems. Effective signal integrity is maintained through the use of shielded, multi-pair cabling, which minimizes latency and electromagnetic interference during long-distance transmission.

Frequently Asked Questions

Q: Can this module be hot-swapped while the FCS/SCS is operational?

A: Yes, the ALR121 series supports online module replacement, provided the specific system rack and firmware version allow for hardware hot-swapping. Ensure the associated port is software-disabled before physical removal to prevent bus communication errors.

Q: What is the maximum transmission distance for an RS-485 configuration?

A: The module supports a maximum transmission distance of up to 1200 meters. Performance is dependent on the baud rate, cable capacitance, and the proper termination of the RS-485 bus at both physical ends.

Field Installation Guidelines

Mounting: Install the module into the designated slot on the AFV30/40, A2FV50/70, or ANB10/11 rack. Ensure the locking tabs are fully engaged to guarantee a solid connection to the backplane bus.
Wiring: Use AKB161 or AKB162 shielded 3-pair cables. Connect field wires to the 5-pole terminal block using M4 screws. Tighten to industry-standard torque to prevent vibration-induced loosening.
Shielding: Ground the cable shield at the designated terminal point. Avoid routing serial communication cables in parallel with high-voltage AC power lines to mitigate noise interference.
Configuration: Verify communication parameters (baud rate, parity, data bits) in the system configuration software before initiating data exchange.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.