
Instruction Set
Program Control
3-40
Program control instructions continued...
Instruction
Description
SFC Reset
SFR
(Enhanced, Ethernet, and
ControlNet PLC-5 processors
only)
The SFR instruction resets the logic in a sequential function chart. When the SFR
instruction goes true, the processor performs a lastscan/postscan on all active
steps and actions in the selected file, and then resets the logic in the SFC on the
next program scan. The chart remains in this reset state until the SFR instruction
goes false.
End of Transition
EOT
The EOT instruction should be the last instruction in a transition file. If you do not
use an EOT instruction, the processor always evaluates the transition as true.
User Interrupt Disable
UID
(Enhanced, Ethernet, and
ControlNet PLC-5 processors
only)
The UID instruction temporarily disables an interrupt-driven ladder program (such
as an STI or PII) from interrupting the currently executing program.
User Interrupt Enable
UIE
(Enhanced, Ethernet, and
ControlNet PLC-5 processors
only)
The UIE instruction re-enables the interrupt-driven ladder program to interrupt the
currently executing ladder program.
SFC Reset
Prog File Number
3
SFR
(EOT)
(UID)
(UIE)