OSF

One Shot Falling

• Library:

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Description

The OSF block implements the OSF instruction. The block sets the output bit for one scan when the rung-condition-in transitions from true to false.

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.

OB — Output Bit

boolean

Bit to be modified when the rung-condition-in transitions from false to true.

Data Types: Boolean

Parameters

Storage Bit — Internal storage bit

SB (default) | boolean

Internal storage bit that retains the rung-condition-in from the last time the instruction was executed. Specified 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.

Programmatic Use

Block Parameter: PLCOperandTag

Type: character vector

Value: character vector

Default: 'SB'