TOF ( Off Delay )
| Function name | TOF_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 | ||
| IN | Normal | R , RW | F , B , W , L , S | Timer activation on rising edge |
| PT | Normal | R , RW | B , W , L , S | Preset timer in milliseconds |
| Q | Normal | W , RW | F , B , W , L , S | Resulting state of the elaboration function |
| ET | Normal | W , RW | B , W , L , S | Timer value |
| ENO | Right Power Flow | IEC1131-3 enable output |
Description :
The function block TOF is used to delay the setting of an output to “false” for an established time period after the input became false. The block counts until the preset value when the activation input (IN) becomes false. If the elapsed time (ET) is greater than or equal to the preset time (PT), the output bit of the timer (Q) is activated. When it’s reached the preset time, the output bit of the timer becomes false and the elapsed time is maintained until the activation input doesn’t set the transition to true. When the activation input (IN) sets the transition to false for a period of time less than the preset time (PT), the output bit remains true.
The timer TOF has the resolution of 1ms.