Hello,
I am new to programming PLC's and would ask for assistance with my program.
On the unit "NET-2" I have a program that monitors a "line fault" input. This signal will be normally energised from the Field Isolator (for fail safe purposes). On my mimic display, I have a lamp for each of the 20 signals. The lamps will be normally de-energised, so the easiest option was to run these signals through the PLC in order to change the logic from Normally Energised, to Normally De-energised (as we had many spare I/O).
The problem I am facing is when I try to run the simulation mode, I get an error saying "3Q01 ~ 3Q06 cannot be used as a coil". I have checked and cannot find the reason for this. The outputs are not duplicated.
I have searched the internet and the forums to see if anyone else had a similar problem, but have been unsuccesful in getting any useful information regarding this. I am sure that with my very limited knowledge, I am making a simple error that can easily be fixed, but would appreciate any support you are able to offer!
Thanking you in advance for your help!
David