Process variable

Production process variables

Overview

The Process Variable represents the measured value or parameter of a particular part of a process which is being monitored and controlled.Usually, a process variable is linked to a PLC tag, where actual values are being referenced.

Navigation

Navigation: Settings > Configuration > Process Variable

Creating a new Process Variable

On the table click Actions > Create; you will be presented with a pop-up.

Fields

Name	Description
Name *	The text name of the process variable
Uom	This will open a drop-down selection; the value entry comes from the Unit of measure configuration.
Description	A text description of the process variable.
Constraint Min	The minimum numeric value, that prevents the submission of an activity, if not met. Usually, this is below the Lower Limit.
Constraint Max	The maximum numeric value, that prevents the submission of an activity, if exceeded. Usually, this is above the Upper Limit.
Display Order	Defines the order in which the entry will be displayed in the selection
Decimals	Represents the precision of the number entered. If this value is set, TilliT will round the number entered to the nearest decimal place.
Target	The optimum numeric value which, if controlled, can guarantee compliance with the process operation. If both Upper Limit and Lower Limit are left blank, you must meet the Target precisely.
Upper Limit	The maximum numeric value of a measured asset variable where, if exceeded, will have a potential effect on the process operation.
Lower Limit	The minimum numeric value of a measured asset variable where, if not met, will have a potential effect on the process operation.
Upper Warning Limit	The numeric value at which the data point would be close to the upper limit but not quite there. This will not fail the form.
Lower Warning Limit	The numeric value at which the data point would be close to the lower limit but not quite there. This will not fail the form.

Click the Save and close button to finalise.