FAQ: Failure of the DP/DP couplers after downloading the hardware configuration

QUESTION:Why do my DP/DP couplers fail when I load my hardware configuration into the controller? ANSWER:You have a PROFIBUS-DP configuration in which you implement DP/DP couplers of release A2. Until now your configuration has worked perfectly. Once you change the version of STEP 7 (e.g. to STEP 7 V5.0 SP4), there no more communications come via the couplers. Upon reinstallation of STEP 7,