Allen-Bradley Logix5000 Reference Manual

112 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 2 Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI)
One Shot Falling with Input
(OSFI)
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 page 107
.
Operands:
Structured Text
Function Block
FBD_ONESHOT Structure
Operand Type Format Description
OSFI tag FBD_ONESHOT Structure OSFI structure
Operand Type Format Description
OSFI tag FBD_ONESHOT Structure OSFI structure
OSFI(OSFI_tag);
Input Parameter Data Type Description
EnableIn BOOL 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.
InputBit BOOL Input bit. This is equivalent to rung condition for the relay ladder OSF instruction
Default is cleared.
Output Parameter Data Type Description
EnableOut BOOL The instruction produced a valid result.
OutputBit BOOL Output bit.

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English