11/29/2012 9:55 AM | |
Joined: 10/28/2008 Last visit: 7/21/2023 Posts: 245 Rating: (14) |
Hi. Today I tested other two timers: TON and TOF. Regarding these two timers I found this: 1) In principal TON timer delay the output according the time in the input and bool input value has to be all time in log.1. If not timer is stopped. So there is not problem with positive edge on the input. 2) TP function has similar behaviour if timer si up as TOF timer. For example I count 20seconds in TP timer. I have OB35 with 2sesonds cyclic period. I count in OB35 every cyclic call some Counter. If I count 10 in this counter (20 seconds), log.1 (in my example PE) goes to the input of the timer TP. Timer makes pulse on the output - lentgth of the pulse is 20 seconds. If timer is up (output of the timer is set to log.0) and in the same cyclic period the positive egde comes to the input, this PE is ignored and timers output stay in log.0... But this in not so critical as bug in TOF timer. By the way still no response from Siemens development. I am in contact still with technical support only. If you can please see program in attachment.. Georgio AttachmentTOFproblem_20121129.zip (322 Downloads) |
Georgio |
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12/4/2012 10:35 AM | |
Joined: 4/11/2012 Last visit: 9/20/2024 Posts: 181 Rating: (34) |
Nice. :) Good to know the specific PLC:s it affects. Good job on finding this! |
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