If you have configured the use of Input_PER in the basic setting, you must convert the value of the analog input to the physical quantity of the process value. The current configuration is displayed in the Input_PER display.
Input_PER will be scaled using a low and high value pair if the process value is directly proportional to the value of the analog input.
Procedure
To scale the process value, follow these steps:
-
Enter the low pair of values in the "Scaled low process value" and "Low" input fields.
-
Enter the high pair of values in the "Scaled high process value" and "High" input boxes.
Default settings for the value pairs are stored in the hardware configuration. To use the value pairs from the hardware configuration, follow these steps:
-
Select the PID_Compact instruction in the programming editor.
-
Interconnect Input_PER with an analog input in the basic settings.
-
Click the "Automatic setting" button in the process value settings.
The existing values will be overwritten with the values from the hardware configuration.