Applies To:
  • CitectSCADA 5.21 Service Pack F, 5.21 Service Pack G, 5.30

For BSAP networks, whenever any RTU within the BSAP network is disconnected, the whole Channel (and all the units connected to it) are rendered offline. This is because of the Channel Offline message which is returned to Citect.

There may be some abnormal behaviour when an RTU which resides under the Master RTU is disconnected. When a tag is read from Citect, the driver returns Channel Offline to Citect, and the whole channel and all the units connected to this channel goes offline. However, after sometime, InitChannel is called, which returns Channel Online as the Master RTU is still connected through serial cable. The next time a tag is then read form the disconnected Unit, it is set offline again by the driver because the read is unsuccessful. Then the cycle of OnLine / Offline is continued. This should have been prevented if an OpenBSI API function were available to check the "health" of a slave unit in the InitUnit function. There is NONE available, so we could only check it's health when a read / or write request is received from Citect.


CIT has confirmed this to be a problem in OpenBSI Driver v3.02.07.000. We are still researching this problem and will post new information here as it becomes available.