One Shot Falling (Osf); Relay Ladder Operands - Allen-Bradley Logix5000 Reference Manual

One Shot Falling (OSF)

Description:
Arithmetic Status Flags:
Fault Conditions:
The OSF instruction sets or clears the output bit depending on the status of the
storage bit.
This instruction is available in structured text and function block as OSFI, see
page 112.
Operands:

Relay Ladder Operands

Operand
Storage bit
Output bit
When disabled and the storage bit is set, the OSF instruction sets the output bit.
When disabled and the storage bit is cleared, or when enabled, the OSF
instruction clears the output bit.
Rung-condition-
Storage
Output Bit
Not affected
None
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI)
Type Format
BOOL Tag
BOOL Tag
Instruction is
executed
Description
Internal storage bit
Stores the rung-condition-in from the last time the
instruction was executed
Bit to be set
Instruction resets
during next scan
Chapter 2
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