CTU ( Up Counter )
| Function name | CTU_010 |
|---|---|
| Function version | 1.0 |
| Function state | stable |
| Compatibility with IEC61131-3 | compatible |
Graphic symbol :
Input / Output :
| Name | Belonging Group | Access | Types of data | Description |
|---|---|---|---|---|
| EN | Left Power Flow | IEC1131-3 enable input | ||
| CU | Normal | R , RW | F , B , W , L , S | Increase counter on the raising front |
| R | Normal | R , RW | F , B , W , L , S | Reset counter |
| PV | Normal | R , RW | B , W , L , S | Preset counter |
| Q | Normal | W , RW | F , B , W , L , S | Counter state |
| CV | Normal | W , RW | B , W , L , S | Present value of the counter |
| ENO | Right Power Flow | IEC1131-3 enable output |
Description :
The function block CTU is used to count the pulses noticed in the input CU. Each raise front of the input CU increases the counter of a unit. The value of the counter can be cancelled setting a value different from 0 (zero) in the input R. The output CV provides the current value of the counter. If the value of the counter is less of the limiting value PV, the output Q will have the Boolean value 0 (zero). The output Q is set to 1 when the limiting value is reached or exceeded, and, in that case, the counter stops counting the raising front of the input CU.