Hello, it seems like I may be overanalyzing this issue, but here's what's going on. I am currently running a program for a water valve on a DI system, with a PID controlling the valve through a downstream transmitter. Everything is functioning perfectly. However, in the event of a power loss or application restart, the Input Enable values reset to 0, causing all PID values to also reset to 0. We then have to manually input the values again. I am having trouble finding a way for the panelview to save the previous state. We are utilizing a PLC 5 system. The issue lies with the panelview resetting all PID input enable values to 0. Any assistance in preventing this issue would be greatly appreciated. Thank you.
Some initial considerations to ponder: (1) In the event of a power outage for the HMI, does the PLC lose power as well? (2) Is there a battery in the PLC CPU, and if so, is it functioning properly? (3) Can the process continue running if the HMI is disconnected? The root of the problem appears to be the PanelView inserting a zero in all PID input enable values. This anomaly is quite unusual, suggesting a potential issue with your PLC processor. Explore further to pinpoint the cause.
To ensure continuous power supply to the Programmable Logic Controller (PLC), we were configuring the PanelView with new screens. However, we noticed that when power is cut off from the PanelView or when returning to the configuration screen and reloading the application, the Input Enable push button values reset to 0, causing all PID values to reset as well. We had hoped that the PanelView would retain the last state in case of power loss, but unfortunately, it does not have this feature. We are now considering implementing logic in the PLC program to prevent the values from resetting to 0. Our goal is to avoid the PanelView defaulting to 0 on the Input Enable buttons. Thank you.
When power is disconnected from the panelview or the system returns to the configuration screen and the application is reloaded, the Input Enable push button values are reset to 0, causing all PID values to also reset to 0. To confirm if the HMI is the issue, try creating a default numeric input on the screen linked to an unused PLC tag. Input a value and then reboot the HMI - under normal circumstances, the value should remain unchanged in the numeric input. Feel free to share the project file for further examination.
When dealing with a PV Standard, it is advisable to locate the option to disable writing initial values on startup. It is uncertain if the PV+ model offers a similar setting in its configuration.
It sounds like you're dealing with a frustrating issue! Have you considered implementing a memory retention feature in the PanelView or using a non-volatile memory option within your PLC setup? Storing the last known good values to retain during a power loss could be a game changer. You might also explore using data files to save your PID settings automatically at intervals, so you don’t have to re-enter them manually. It might take some experimenting, but it could save you a lot of headaches in the long run!
It sounds like you're experiencing a common challenge with retaining PID controller settings after a power loss. Have you looked into adding non-volatile memory options to your PLC setup? This could enable you to save the configuration data before a shutdown and restore it automatically upon startup. Additionally, some PanelView interfaces have options for storing system settings or configurations that can be leveraged. It might require some additional setup, but it could save you a lot of hassle in the event of an unexpected restart. Good luck!
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Answer: Answer: The Panelview Plus 1500 resets the PID input enable values to 0 after a power loss or application restart, causing all PID values to also reset to 0. This behavior is causing the issue described in the discussion thread.
Answer: Answer: To prevent the Panelview Plus 1500 from resetting PID input enable values to 0, you may need to explore settings or configurations within the PLC 5 system or the Panelview Plus 1500 itself that allow for the saving of previous state values.
Answer: Answer: It seems that the issue lies with the Panelview Plus 1500 resetting all PID input enable values to 0. Investigating methods to save the previous state of these values within the Panelview Plus 1500 or through interactions with the PLC 5 system might help in preventing the need for manual input after power loss or restart.
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