To make major logic modifications, you still have to use the PLC programming software, not the HMI. If the data change procedure has not been programmed into the PLC program AND the HMI program, then you cannot do it using only the HMI. The HMI can make any allowed change that has been programmed into the PLC program. It is normally much easier to make operating changes using the operator panel designed for that purpose - the Human Machine Interface, the "HMI" panel. The PLC program is after all the center of process control, with the HMI operator panel serving as a control window into the PLC program.īut because these actions could be done using the PLC programming software does not mean that you should PLAN to use that method as a normal operating procedure. Theoretically, if you have the PLC programming software, normally you can upload "data" (contained in the PLC program) to a connected computer, and also make changes in variables, such as timers, counters, limits, setpoints, and so on.
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