Virtual channels are used to transmit virtual trends to an ibaPDA process data acquisition system using the fiber optic connection on the CMU. Alternatively, the signals can be forwarded to an external output terminal (e.g. WAGO I/O terminals, series 750) using an ibaNet750-BM-D module. Trend values or limit violations (status) can be output.

Note that the switch S1 on the CMU hardware must be set to “1” if this connection is used. Further information can be found in the CMU manual.

The virtual channels must be enabled before configuration can be carried out. In addition, the cycle time for writing the virtual channels has to be specified. This is set to 1000 ms by default.

For further details on configuration and output of virtual trends using a CMU module, see Channels.