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PID_Compact

4/11/2022 4:46 PM	Rate (0)
Neogazz_Alpha Posts: 23 Rating: (0)	I am using a S7-1500 PLC, TIA Portal V17 and the PID_Compact block to control pump speed based on a pressure setpoint. My PID_Compact block 'output' only ramps up, but never ramps down. If I set my Setpoint to 2.0 and the input/PV I have set to 5, it still ramps up. What could the problem be?
Neogazz_Alpha Posts: 23 Rating: (0)
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4/11/2022 4:55 PM	Rate (0)
Éber Oliveira Experienced Member Joined: 6/3/2013 Last visit: 11/17/2025 Posts: 50 Rating: (6)	Hi, Test with the Setpoint greater than the PV and check if the output goes down. Check Reverse Operation option. See: TIP: PID (FB PID_Compact) V2.x (configured with STEP7 V12)
	And you will know the truth, and the truth will set you free.
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4/12/2022 1:31 PM	Rate (0)
Neogazz_Alpha Posts: 23 Rating: (0)	If the SP is greater than the Input/PV then the Output still ramps up
Neogazz_Alpha Posts: 23 Rating: (0)
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4/12/2022 1:45 PM	Rate (0)
mopS04 Posts: 5521 Rating: (1058)	hi Neogazz_Alpha, can you show us a screenshot of the online view of the block? regards,
mopS04 Posts: 5521 Rating: (1058)
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4/12/2022 2:55 PM	Rate (0)
Neogazz_Alpha Posts: 23 Rating: (0)	See attached picture. As you can see the output just ramps up to 100% even though the SP is lower than the Input/PV. Any ideas why? Attachment PID_Compact_Online1.jpg (618 Downloads)
Neogazz_Alpha Posts: 23 Rating: (0)
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4/12/2022 5:14 PM	Rate (0)
Neogazz_Alpha Posts: 23 Rating: (0)	Problem solved, the online parameters of the PID_Compact block needed to be correctly setup like in the attached picture Attachment PID_Compact_Online2.jpg (572 Downloads)
Neogazz_Alpha Posts: 23 Rating: (0)	Last edited by: Neogazz_Alpha at: 04/12/2022 17:15:24
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