ABB 6637844A1 Infi-90 Loop Interface Module Assembly

ABB Bailey INLIM03 Infi-90 Loop Interface Module Assembly (6637844A1) is the Plant Loop to Node communications gateway used in the ABB INFI-90 and Symphony distributed control systems. It provides the Plant Loop’s serial high‑speed interface and forwards messages between Plant Loop nodes and Process Control Units via an INBIM02 Bus Interface Module, designed to work with termination hardware such as NTCL01 and NICL01. The LIM supports up to 63 nodes on the Plant Loop network and can be assigned an address from 1 to 63 using two DIP switches (Event/Error Counter Address). Eight LEDs on the front panel display the contents of event and error counters and show pass/fail information during onboard diagnostics, aiding quick loop health checks. This INLIM03 assembly is associated with the ABB Symphony NLIM0 family and is described in sources as an obsolete Loop Interface Module within the legacy INFI‑90 ecosystem, typically serviced or replaced through Bailey/ABB support channels.