What is the difference between the different operating modes of the Programmable Controller’s CPU Unit (i.e., PROGRAM mode, RUN mode, and MONITOR mode)?
In MONITOR mode the CPU Unit is running. I/O is processed in the same way as in RUN mode. The operating status of the CPU Unit can be monitored, bits can be force-set/reset, the set values and present values of timer and counter instructions can be modified, and the present values of word data can be modified. MONITOR mode is used for system adjustments during trial operation.