The Siemens 6ES5304-3UB11 Interface Module is the IM304 CC interface card for SIMATIC S5, acting as the link between the main unit and decentralized I/O in distributed configurations. It enables decentral connections up to 600 meters from ED to CD and supports coupling central devices for S5 families such as the 150H, 155H, 115H, and 115F. Listed as a spare part for SIMATIC S5, this IM304 CC interface module is sometimes shown as discontinued without a direct replacement in Siemens catalogs.
