3HAC55438-001/02

3HAC55438-001/02

The network components should not be replaced during operation. All S900 stations connected to the intrinsically safe bus segment should be switched off. 2.1.4 Communication interface update and physical layer update according to PROFIBUS International Guideline RS485-IS during operation Network components can only be replaced during operation if:  A redundant PROFIBUS network,  Redundant S900 communication interfaces and  Redundancy mode 1 (ABB redundancy) are used. A seamless update during normal operation is only possible from CI920* V1.5.9 to CI920A* V2.1. Installations using older versions of communication interfaces such as CI920* V1.4.1 or V1.4.2 cannot be converted seamlessly, in such cases the relevant plant segment should be shut down. If invalid measured values are tolerated during redundancy switch over from the old (CI920* V1.4.2) to the new (CI920A* V2.1) communication interface, conversion is possible without disconnection. Conversion must be made taking utmost care and according to the procedure described below. (1) Check the firmware version of the communication interfaces. All ‘old’ communication interfaces CI920* must correspond to version 1.5.9, if a seamless update is required. (2) Check the availability of redundancy. All slaves of the active and passive PROFIBUS line of the master must be available. No such diagnostic message must be pending. (3) Disconnect the PROFIBUS connector of one line (preferably line B or 2) from the master. Slaves that have been active on this PROFIBUS line are now switched over to the redundant intact PROFIBUS line. (4) Uninstall / disconnect passive communication interfaces CI920* of all S900 stations of the affected segment. The passive communication interface can be identified by a not lighted PB LED. (5) Switch off the PROFIBUS network of the passive line by cutting off the power supply for PROFIBUS isolating repeaters (e.g.: BI913S).