TOF
The function block TOF is a timer off-delay.
Inputs
VAR_INPUT
IN : BOOL; (* starts timer with falling edge, resets timer with rising edge *)
PT : TIME; (* time to pass, before Q is set *)
END_VARName | Type | Description |
|---|---|---|
IN | BOOL | Starts the timer with a falling edge and resets the timer with a rising edge. |
PT | TIME | Time elapsed before Q is set. |
Outputs
VAR_OUTPUT
Q : BOOL; (* is FALSE, PT seconds after IN had a falling edge *)
ET : TIME; (* elapsed time *)
END_VARName | Type | Description |
|---|---|---|
Q | BOOL | Q has a falling edge if the time specified in PT in milliseconds has elapsed. |
ET | BOOL | If IN = TRUE, the outputs are TRUE or 0. As soon as IN = FALSE, the time in ET is incremented in milliseconds until the value reaches PT, then it remains constant. Q is FALSE, if IN = FALSE and ET = PT. Otherwise Q = TRUE. |
Graph showing TOF over time:
The function TOF requires 15 bytes of data
Requirements
Development environment | Target platform | PLC library to include |
|---|---|---|
TwinCAT v3.0.0 | PC or CX (x86) | Tc2_Standard |