9/29/2022 9:58 AM | |
Joined: 1/21/2013 Last visit: 7/15/2024 Posts: 2987 Rating:
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Hi dang trinh, in the system manual 'STEP 7 and WinCC Engineering V17' you will find in chapter 'Enabling system memory' the following information: System memory bit 1After changing a diagnostic information, the diagnostic status change bit is 1 for the duration of a cycle. If, for example, the CPU receives the diagnosis "short circuit on channel 2" from one of the modules, the bit will be present for one cycle. If the diagnostic message returns to the channel after the short-circuit has been rectified, the bit will again be present for one cycle. So it will be true only for one PLC cycle, which is related to the cyclic OBs. Kind regards |
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9/29/2022 12:16 PM | |
Joined: 3/21/2022 Last visit: 9/29/2022 Posts: 27 Rating:
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is there another way to make one PLC cycle by using user program, Sir? |
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