Allen-Bradley Logix5000

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 113
Bit Instructions (XIC, XIO, OTE, OTL, OTU, ONS, OSR, OSF, OSRI, OSFI) Chapter 2
Description: When the InputBit is cleared and the InputBit
n-1
is set, the OSFI instruction sets
the OutputBit. When InputBit
n-1
is cleared or when InputBit is set, the OSFI
instruction clears the OutputBit.
Arithmetic Status Flags: Not affected
Fault Conditions: None
Execution:
InputBit
OutputBit
Instruction is
executed
Instruction resets
during next scan
InputBit
n-1
4004
Condition Function Block Action Structured Text Action
Prescan No action taken. No action taken.
Instruction first scan InputBit
n-1
is cleared. InputBit
n-1
is cleared.
Instruction first run InputBit
n-1
is cleared. InputBit
n-1
is cleared.
EnableIn is cleared EnableOut is cleared, the instruction does nothing, and the
outputs are not updated.
N/A
EnableIn is set On a cleared to set transition of InputBit, the instruction
clears InputBit
n-1
.
The instruction executes.
EnableOut is set.
On a cleared to set transition of InputBit, the instruction
clears InputBit
n-1
.
EnableIn is always set.
The instruction executes.
Postscan No action taken. No action taken.