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PID error

Created by: amudhan at: 2/19/2014 12:02 PM (6 Replies)

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2/19/2014 12:02 PM	Rate (0)
amudhan Advanced Member Joined: 7/26/2012 Last visit: 12/22/2025 Posts: 24 Rating: (0)	HI Guys, I am using 1200 plc, programming software- TIA PORTAL. getting error in PID block. give me some ideas. Thank u.............. Attachment PID ERROR.zip (592 Downloads)
	Amudhan...
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2/19/2014 12:41 PM	Rate (0)
Amol V Posts: 66 Rating: (1)	For which action you are using PID i.e for contrilling output continously or by pulsating
Amol V Posts: 66 Rating: (1)
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2/19/2014 12:55 PM	Rate (0)
amudhan Advanced Member Joined: 7/26/2012 Last visit: 12/22/2025 Posts: 24 Rating: (0)	For continuous o/p...
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2/19/2014 12:58 PM	Rate (0)
Amol V Posts: 66 Rating: (1)	If you are using PID for continous output control then you can use "CONT_C" or "CONT_S" instruction for pulsating output.
Amol V Posts: 66 Rating: (1)
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2/19/2014 1:06 PM	Rate (0)
amudhan Advanced Member Joined: 7/26/2012 Last visit: 12/22/2025 Posts: 24 Rating: (0)	Actually the error occurs, while the I/p from thermocouple gets disabled. If i put CPU to stop mode and START mode, error disables...
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2/19/2014 4:13 PM

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koenb

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(23)

Error (DW#16#...) IF 1

The "Input" parameter is outside the process value limits.

Input > sPid_Cmpt.r_Pv_Hlmor
Input < sPid_Cmpt.r_Pv_Llm

You cannot start the actuator again until you eliminate the error.

The use of a limit function on the input variable will prevent this.

RTD inputs have this kind of behavior to . You can connect a reset logic to the reset_inp of the block if this ( or other errors ) occur. If you do so , the PID will restart automatic.

koenb

2/20/2014 11:41 AM	Rate (0)
amudhan Advanced Member Joined: 7/26/2012 Last visit: 12/22/2025 Posts: 24 Rating: (0)	Thanks...
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Created by: amudhan at: 2/19/2014 12:02 PM (6 Replies)

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