The function “non-persistent online change” now means that individual changes in user programs can be transferred to the control system. This function is available in Release 13 of the automation system PSS 4000 for safety applications.
User programs and software blocks of a control system are often only put through final testing during commissioning, when they undergo multiple modifications. The “non-persistent online change” function allows individual changes to be fed into one or more control systems of the automation system PSS 4000 without it being necessary to compile and load the entire program, which saves time during commissioning.
The changes are fed in without stopping the control system—the new program becomes active on the head modules with the next clock cycle after downloading. The changes apply for a maximum of 12 hours or until the control system is restarted, so they are not permanent (non-persistent). If the changes are not accepted, the control system re-establishes the status of the last complete download.
As well as simplifying and accelerating commissioning, the function improves the handling of safety in hectic commissioning processes.
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