Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 107
Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI) Chapter 2
One Shot Falling (OSF)
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
Description: 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.
Arithmetic Status Flags: Not affected
Fault Conditions: None
Operand Type Format Description
Storage bit BOOL Tag Internal storage bit
Stores the rung-condition-in from the last time the
instruction was executed
Output bit BOOL Tag Bit to be set
Rung-condition-
Storage
Output Bit
Instruction is
executed
Instruction resets
during next scan
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