Allen-Bradley Logix5000 Reference Manual page 113

Description:
Arithmetic Status Flags:
Fault Conditions:
Condition
Prescan
Instruction first scan
Instruction first run
EnableIn is cleared
EnableIn is set
Postscan
When the InputBit is cleared and the InputBit
the OutputBit. When InputBit
instruction clears the OutputBit.
InputBit
InputBit
OutputBit
Not affected
None
Execution:
Function Block Action
No action taken.
InputBit is cleared.
n-1
InputBit is cleared.
n-1
EnableOut is cleared, the instruction does nothing, and the
outputs are not updated.
On a cleared to set transition of InputBit, the instruction
clears InputBit .
n-1
The instruction executes.
EnableOut is set.
No action taken.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI)
is cleared or when InputBit is set, the OSFI
n-1
n-1
Instruction is
Structured Text Action
No action taken.
InputBit
InputBit
N/A
On a cleared to set transition of InputBit, the instruction
clears InputBit
EnableIn is always set.
The instruction executes.
No action taken.
is set, the OSFI instruction sets
n-1
Instruction resets
executed during next scan
is cleared.
n-1
is cleared.
n-1
.
n-1
Chapter 2
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