TOF
Timer Off Delay
- Library:
Description
The TOF block implements the TOF ladder instruction.
When the rung conditions are true, the block accumulates time until:
The timer is disabled
The timer completes
Ports
Input
EnableIn — Enable Input
off (default) | on
Controls the execution of the block. EnableIn reflects the rung state preceding the block. If the rung state preceding the block is false, EnableIn is false, the block does not execute and the outputs are not updated.
Output
EN — Enable Output
off (default) | on
By default, EnableOut follows the state of EnableIn. If the EnableIn input to the block is false, the logic implemented by the block is not executed and EnableOut signal is set to false.
Parameters
Timer Tag — Timer Structure
T (default) | character vector
Specify the timer parameters in the format of tags. In Ladder
Diagrams, tags (variables) are used for representing all inputs, outputs, and internal
memory with attributes such as Data Type, Initial
Value, and size. To change the attributes of the
Operand Tag, open the Program Variables table
within the Ladder Diagram Program block. The Data Type
of the timer tag is of the Bus:TIMER type with its initial value
specified as a structure containing the following fields:
| Field | Description | Default Value |
|---|---|---|
PRE | The preset value specifies the value (1 millisecond units) which the accumulated value must reach before the instruction indicates it is done | 0 |
ACC | The accumulated value specifies the number of milliseconds that
have elapsed since the | 0 |
EN | The enable bit contains rung-condition-in when the instruction was last executed. | 0 |
TT | The timing bit when set indicates the timing operation is in process. | 0 |
DN | The done bit when set indicates the timing operation is complete (or paused). | 0 |
Programmatic Use
Block Parameter:
PLCOperandTag |
| Type: character vector |
| Value: character vector |
Default: 'T' |