# Process Variable

### 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

{% hint style="info" %}
Navigation: ***Settings > Configuration > Process Variable***
{% endhint %}

### Creating a new ***Process Variable***

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

### **Fields**

<table><thead><tr><th width="350">Name</th><th>Description</th></tr></thead><tbody><tr><td>Name *</td><td>The text name of the process variable</td></tr><tr><td>Uom</td><td>This will open a drop-down selection; the value entry comes from the Unit of measure configuration.</td></tr><tr><td>Description</td><td>A text description of the process variable.</td></tr><tr><td>Constraint Min</td><td>The minimum numeric value, that prevents the submission of an activity, if not met. Usually, this is below the Lower Limit.</td></tr><tr><td>Constraint Max</td><td>The maximum numeric value, that prevents the submission of an activity, if exceeded. Usually, this is above the Upper Limit.</td></tr><tr><td>Display Order</td><td>Defines the order in which the entry will be displayed in the selection</td></tr><tr><td>Decimals</td><td>Represents the precision of the number entered. If this value is set, TilliT will round the number entered to the nearest decimal place.</td></tr><tr><td>Target</td><td>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.</td></tr><tr><td>Upper Limit</td><td>The maximum numeric value of a measured asset variable where, if exceeded, will have a potential effect on the process operation.</td></tr><tr><td>Lower Limit</td><td>The minimum numeric value of a measured asset variable where, if not met, will have a potential effect on the process operation.</td></tr><tr><td>Upper Warning Limit</td><td>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.</td></tr><tr><td>Lower Warning Limit</td><td>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.</td></tr></tbody></table>

Click the ***Save and close*** button to finalise.


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