Understand the groov View Access Boundary
groov View can access PAC Control variables, but it cannot connect directly to the PAC Control PID parameters. The same limitation applies to point data such as maximum, minimum, and latch values. Treat PID parameters as controller-side data that requires an intermediate variable interface.
Bridge PID Parameters Through PAC Control Variables
Create float variables in PAC Control for each PID value that groov View must display or edit, then use a PAC Control chart to transfer values between those variables and the PID loop.
- Create float variables for the required proportional, integral, and derivative settings.
- Bind the groov View controls and indicators to those variables.
- In a PAC Control chart, copy PID parameters into the variables for display and copy accepted operator changes back into the PID loop.
- Verify both directions: confirm that controller-side changes appear in groov View and that groov View edits reach the intended loop.
Apply the Documented Units and Validate Ranges
| Setting | Documented unit | Evidence-supported range |
|---|---|---|
| Proportional | Unitless | Not established |
| Integral | Seconds | Not established |
| Derivative | Seconds | Not established |
Do not implement the proposed percentage and seconds limits as validated PAC Control ranges; the available evidence explicitly says those listed limits are incorrect. Confirm the allowable values in the applicable PAC Control documentation before adding input validation or operator limits.
Account for Tuning and Scan Rate
PAC Control does not provide an auto-tune feature according to the available evidence. A web-based reaction-curve tuning calculator is available from Opto 22, but tuning still requires deliberate application and verification of the resulting values. Include the controller scan rate in the tuning review because it is as important to loop behavior as the proportional, integral, and derivative settings.
FAQ
Can groov View access PAC Control PID parameters directly?
No. It can access PAC Control variables, so expose the required PID values through float variables and transfer them with a PAC Control chart.
Does PAC Control have PID auto-tuning?
No auto-tune feature is identified in PAC Control. Opto 22 provides a web-based reaction-curve tuning calculator for calculating tuning values.
What units does PAC Control use for PID settings?
Proportional is unitless, while integral and derivative use seconds. The supported numeric ranges are not established by the available evidence, so verify them in the applicable PAC Control documentation.