I'm using NI-FBUS configuration utility v2.3.6 to set up a simple demonstration loop. At the moment the setup is working well for a simple PID controller with one AI, one PID and one AO. I have attempted to extend this to add a second AI and PID as a master controller, turning the loop into a cascade system. I have been unsuccesful, with the following effects:
* The master controller PV is always bad
* Replacing the slave controller with the master PID controller, the master controller PV is still bad, but the control loop still functions as if the substitution was never made.
* Unwiring the slave (working) controller from the system, the master controller is still bad, but the action of the loop is not affected. It is as if the control loop has never been changed. When monitoring the I/O of the various blocks, it is obvious that the original PID block is still performing the control function, despite having been removed from the loop.
From reading the manual, I thought changes were committed automatically, so that simply moving blocks about and rewiring them with the wiring tool changed the association. Is there a step I'm missing to reconfigure loops to include new or changed functions? Or do I have to reset all blocks to their factory settings prior to a reconfiguration?
Best regards,
