One Shot Falling With Input (Osfi); Structured Text; Function Block; Fbd_Oneshot Structure - Allen-Bradley Logix5000 Reference Manual

Chapter 2 Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI)
One Shot Falling with Input
(OSFI)
OSFI(OSFI_tag);
Input Parameter Data Type
EnableIn BOOL
InputBit BOOL
Output Parameter Data Type
EnableOut BOOL
OutputBit BOOL
112
The OSFI instruction sets the OutputBit for one execution cycle when the
InputBit toggles from set to cleared.
This instruction is available in relay ladder as OSF, see
Operands:

Structured Text

Operand
OSFI tag

Function Block

Operand
OSFI tag

FBD_ONESHOT Structure

Description
Function Block
If cleared, the instruction does not execute and outputs are not updated.
If set, the instruction executes.
Default is set.
Structured Text
No effect. The instruction executes.
Input bit. This is equivalent to rung condition for the relay ladder OSF instruction
Default is cleared.
Description
The instruction produced a valid result.
Output bit.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type
FBD_ONESHOT
Type
FBD_ONESHOT
page 107.
Format Description
Structure OSFI structure
Format Description
Structure OSFI structure