F_TRIG: Recognize negative edge and trigger impulse
The F_TRIG (FB403) block recognizes the negative slope.
Functionality
For a negative slope of input [In], output [Out] is set to [Out] = 1 for the program cycle.
Inputs
Pin | E | Description |
In | pa | Input |
Outputs
Pin | E | Description |
Out | a | Output |
Input values
Pin | Description | Data Type | Default value | E.g. Engineering unit or Text group | Min. | Max. |
In | Input | Boolean | 0 (No) | No, Yes |
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Output values
Pin | Description | Data Type | Default value | E.g. Engineering unit or Text group | Min. | Max. |
Out | Output | Boolean | 0 (Off) | Off, On |
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Application
The F_TRIG function block is used for various kinds of control tasks such as to recognize the initial use of a button.
Process response
Initialization response: In the first cycle, Out = 0 (Off); in the second cycle the block is processed using the pending input value.
Troubleshooting
Standard (see General rules and information).