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s7-200 input delay 6.40 ms to 0.20ms
Created by: shivendra jaiswal at: 9/24/2014 11:08 AM (5 Replies)
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| 9/24/2014 11:08 AM | |
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Posts: 15 Rating:
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dear Jens_app i have dought first is, in s7-200 cpu we can configure the input delay in system blocks as input delay filter and it is default set on 6.40 ms what happen if we change to 0.20ms and what is the effect on the cpu scan time. second if create a counter with the help of 1ms system timer what does it effect on the scan time and that time how scan time work that time
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Last edited by: Min_Moderator at: 9/24/2014 1:45 PMNew subject after splitting from /tf/WW/en/Posts/112767#top |
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| 9/24/2014 12:21 PM | |
Joined: 1/5/2011 Last visit: 3/13/2025 Posts: 815 Rating:
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Dear shivendra, Onescan cycle includes following: update process image inputs -> execute user program (logic) -> update process image outputs. Your response time is the time it takesfor aninput to cause a change in the output.When a change in theinputoccursat the beginning of the PII update then the response time will equal one scan cycle (best case scenario), if it happens after updating the PII (during execution of the user program or during a PIQ update) your response time will equal ~two scan cycles. I guess the input delay filter you are talking about will filter out input signals that haven't got a "1" signal state for long enough (for example: contact bounce). Now for the timers: Timer functions are updated asynchronous to program execution. The cpu will update the timer function at fixed intervals independant of the processing of the user program. I'd think the timer function will however make a small difference in your scan time, best to be monitored in diagnostics. I hope this answers your questions. Kind regards, Jens |
Last edited by: Jens_app at: 9/24/2014 12:43 PMPlease verify correction (anyone?) Last edited by: Jens_app at: 9/24/2014 12:23 PMKeep it simple and on-topic. |
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