CTU
The CTU function block is an up counter.
If RESET = TRUE, the counter variable CV is initialized with zero. If the CU input has a rising edge from FALSE to TRUE, the counter variable CV is increased by one. If the counter variable CV reaches the value of the counter limit PV, the Q output is set to TRUE.
Inputs
VAR_INPUT
CU : BOOL; (* Count Up on Rising Edge*)
RESET : BOOL; (* Reset Counter to 0 *)
PV : WORD; (* Counter Limit *)
END_VARName | Type | Description |
|---|---|---|
CU | BOOL | On a rising edge: count up by one |
RESET | BOOL | TRUE: Reset counter variable CV to the value 0 |
PV | WORD | Counter limit |
Outputs
VAR_OUTPUT
Q : BOOL; (* Counter reached Limit *)
CV : WORD; (* Current Counter Value *)
END_VARName | Type | Description |
|---|---|---|
Q | BOOL | TRUE if the counter value CV is greater than or equal to the counter limit PV. |
CV | WORD | Counter variable (current counter value) |
Requirements
Development environment | Target platform | PLC library to include |
|---|---|---|
TwinCAT v3.0.0 | PC or CX (x86) | Tc2_Standard |