Overview
Manuals
Link Setup
Integration Review
Startup Review
Features:
- Serial Communication Modules for the documented Yokogawa CENTUM VP.
- Interface: RS-422/RS-485 (4-wire system).
- Communication function: Half-duplex.
ALR121-S51 S1 belongs to the Yokogawa CENTUM VP and performs the documented serial communication modules role in the Yokogawa CENTUM process-control system. The retained technical evidence records Interface: RS-422/RS-485 (4-wire system); Communication function: Half-duplex; Transmission speed: 1200/2400/4800/9600/19200/38400 bps. The full marking, receiving hardware, connectors or terminals, configuration dependencies and installed position must be matched before substitution.
For installation, retain the Yokogawa CENTUM VP receiving position, connector or terminal arrangement and configuration record. After power restoration, review diagnostics and test the affected operating path before process release.
The ALR121-S51 S1 Serial Communication Modules is supplied only after the complete hardware identity, condition and current OEM lifecycle status have been confirmed.
Yokogawa ALR121-S51 S1 Serial Communication Modules Manual(Datasheets), Link
Important Notice: The linked document or internal product-family information must identify the listed model or its documented family. Confirm the complete order code, hardware revision and installed-system requirements before replacement. Accessories, cables, software and certificates are included only when stated in the quotation. All prices are shown in USD.
Link Setup: ALR121-S51 S1 performs the serial communication modules function within the Yokogawa CENTUM VP. The retained documentation identifies interface as RS-422/RS-485 (4-wire system); apply that value only to this documented execution.
Match the complete label, hardware form and functional position before transferring any setting, cable or termination from the removed unit.
Integration Review: approve ALR121-S51 S1 only for the documented Yokogawa CENTUM process-control system. Compare rack, carrier or panel generation, connector keying, terminal numbering and all paired assemblies with the installation drawings.
Photograph both sides and the installed position before removal so revision markings, jumpers, addressing and channel allocation can be reconstructed accurately.
Startup Review: isolate the equipment, remove stored energy and inspect the receiving hardware before installing ALR121-S51 S1.
Restore power in the approved sequence, review status and diagnostics, then test every affected control, signal, relay, communication, protection or monitoring path against the commissioning record.
