Applies To:
  • CitectSCADA 5.41, 5.41 Service Pack A

If you attempt to read or write data from more than one I/O device of the same remote multi-drop network by forcing a connection using IODeviceControl() type 7, the second I/O device connection attempt will fail because the remote modem is engaged with the first I/O device connection. CitectSCADA will attempt to connect with the remote modem if there is currently an available dial-out modem on the I/O server.

Citect has confirmed this to be a problem in CitectHMI/SCADA versions 5.40 to 5.41 Spk B. This problem has been fixed in version 5.42.