# Using Interlock to Prevent Operation Errors

The touch action will only be executed if the BOOL variable specified in the Interlock Address meets the Touch Enable Condition.

## Example Operation

## Setting Workflow

1. Add Variables
2. Set up Parts

## Add Variables

### Project Explorer : [Variables] ➞ [All Variables]

Add the below variable(s).

#### Variables property:

[Name] | [Data Type] | [Source] | [Initial Value]
Var1 | [DINT] | Any | Any
Interlock | [BOOL] | [Internal] |

## Set up Parts

### Project Explorer : [Screen Design] ➞ [Screens] ➞ [Screen1]

Drag and drop the following objects from the [Tool Chest] to the screen.

#### Numeric Display object (Name: NumericDisplay1) properties:

Tab | Sub Tab | Property | Value
[Function] | [Basic] | [Current Value] | [Variable] [Name]: Var1
[Enable Input Mode] |
[Detail] | [Interlock] | [Variable] [Name]: Interlock

#### Toggle Switch object (Name: ToggleSwitch1) properties:

Tab | Sub Tab | Property | Value
[Function] | [Basic] | [Current Value] | [Variable] [Name]: Interlock