RTO

Retentive Timer On

Since R2019a

• 

Libraries:

Description

The RTO block implements the RTO ladder logic 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 to represent 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 RTO instruction was enabled.	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'

Version History

Introduced in R2019a