Profibus 1.0-12M, DP standard, DB9-F. redundant link module. 2. as for Siemens Y-link and ABB RLMO1 application ... CI-PP21Description: This product is Profibus DP protocol fieldbus redundant module, achieve the exchange between single bus redundant dual bus, ... Summarize] This product is Profibus DP protocol fieldbus redundant link module, achieve the exchange between single bus and redundant dual bus ...