uTOF block
Short summary
Name |
|
→POU type |
|
Category |
|
Conform to →IEC-standard |
not defined in IEC-standard |
Graphical interface |
|
Available since |
version 1.45.0 (for Neuron Power Engineer) |
Functionality
Similar to the TOF
block, this is an edge delay where the turning-off edge is delayed. In contrast to TOF
, the output ET
is not provided for uTOF
.
Enter the delay period at input PT
. If input IN
is →turned on, output Q
returns value TRUE
(or an equivalent). If input IN
is →turned off and the delay period is over, output Q
returns FALSE
(or an equivalent). If input PT
is changed after input IN
has been turned off, the behavior of the block is affected.
This block receives the current system time from the runtime system. This time remains constant while the same task is executed. However, in case of different tasks, it is possible that a different system time is used when the belonging programs are executed (even if the different tasks have the same cycle time). |
The following illustration shows the behavior of uTOF
:
In-/outputs
|
Identifier |
Description |
|
---|---|---|---|
Inputs: |
|
|
input/start |
|
|
preset time |
|
Outputs: |
|
|
output |
Input EN
and output ENO
are available when →calling the block. See "Execution control: EN, ENO" for information on input EN
and output ENO
.
See:
-
"Blocks for safe logic" whether this block is supported for developing safety-relevant applications.
-
"Highlighting safe logic in the FBD-editor" for the effects when using the block as a block for safe logic.
Example for usage within ST-editor
Simple call of uTOF |
---|
|
When creating your application within the ST-editor, enter a call of a block by typing the text as requested by the syntax or use Content Assist.