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TonyGoody

Allen Bradley PID Manual control

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Hi, I'm new to this forum and relatively new to AB PLC's. I'm trying to setup a PID Loop to work with an HMI. I understand that SWM is the preferred manual control method. My problem is that when I set the "PID1.SWM" bit it immediately resets. Nothing in the logic is resetting it and I have tried forcing the bit on in the logic. I'm using a 1769-L36ERM processor with Logic Designer 5000 v24.

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How are you setting it? Post your program and someone with the software can help you look. Note: I am not a RSLogix5000 user.

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If setting this bit from an HMI check the type of push button control you are using. Momentary Push Button will change the state when pressed and return it when released. Maintain Push buttons will change the state when pressed and remains when released.

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Even better, dont manipulate your SWM bit directly from the HMI. Use a separate "pushbutton" bit to latch or seal in the SWM in your logic.

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