Yokogawa ARM55D-000 S1 / ARM55C-000 S1 are 32-channel mechanical-relay output boards for CENTUM field I/O. ARM55D-000 S1 provides M4 normally-open dry-contact outputs, while ARM55C-000 S1 provides M3.5 changeover contacts with both normally-open and normally-closed terminals.
Controller commands reach Yokogawa ARM55D-000 S1 / ARM55C-000 S1 through ADV551 with ATD5A or ADV561 and the AKB331/AKB337 cable route. The board relays then switch the externally supplied load circuits; the backplane command does not provide the load energy.
Yokogawa ARM55D-000 S1 / ARM55C-000 S1 differ in terminal form, contact arrangement and permitted field load. Replacement and commissioning therefore follow the exact board identifier and connected load, not only the shared 32-output count.







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