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Allen Bradley PLC-5 Remote I/O adapter module for connecting 1771 remote chassis I/O to a host controller over Remote I/O architecture.
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The Allen Bradley 1771-ASB Series B is a Remote I/O adapter module for 1771 chassis systems used with PLC-5 era architectures. It enables a remote rack of 1771 I/O modules to exchange data with a controlling processor.
This adapter is typically found in established plant installations where remote I/O networks were deployed to reduce field wiring back to a central control cabinet.
It remains relevant for maintenance, migration staging, and spares support in facilities operating legacy PLC-5 infrastructure.
Used in brownfield plants where distributed 1771 racks continue to serve process units, MCC areas, or production islands while core control strategies remain in PLC-5-class systems.
Verify network addressing, rack configuration, compatibility with existing remote I/O topology, and migration roadmap before replacement.
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