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| 7/17/2018 10:50 AM | |
Joined: 10/11/2006 Last visit: 9/30/2024 Posts: 5909 Rating:
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Hello, Proportional control cannot eliminate the offset error, which is the difference between the desired value and the actual value, SP − PV error, as it requires an error to generate an output. When a disturbance (deviation from existing state) occurs in the process value being controlled, any corrective control action, based purely on Proportional Control, will always leave out the error between the next steady state and the desiredsetpoint, and result in a residual error called the offset error. This error will increase as greater process demand is put on the system, or by increasing the set point. https://en.wikipedia.org/wiki/Proportional_control To minimize the offset error it is possible to increase the resolution or the P-gain. |
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With best regards, |
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| 7/18/2018 3:32 PM | |
Joined: 8/31/2005 Last visit: 8/20/2024 Posts: 2198 Rating:
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In the TO configuration you can define criteria, when a position is reached. Try to reduce the "positioning window": |
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| 7/20/2018 2:52 PM | |
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Posts: 11 Rating:
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I have step 7 version 5.5, there is not LREAL. |
| 7/23/2018 7:51 AM | |
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Posts: 11 Rating:
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I set target position 48,679 (in MC_MoveAbsolute). After executing MC_MoveAbsolute, axis position is 48,679. I set 47,681, axis position 47,680 (after executing). |
| 7/23/2018 3:15 PM | |
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Posts: 11 Rating:
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48,67900085 - axis position 48,679(after execute). 48,68099976- axis position 48,680(after execute). |
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