Automating Manufacturing Systems - Process Control and ...

plc function ref - 34.33
SFR - Sequential Function chart Reset
A
SFR
SFC RESET
Prog File Number
Restart Step At
3
Description:
Status Bits:
Registers:
This function will reset a SFC. In this example when ’A’ goes true the
SFC main program stored in program file 3 will be examined. All sub
programs will be examined, and then the SFC will be reset to the initial
position.
none
none
Available on: PLC-5
UID, UIE - User Interrupt Disable, User Interrupt Enable
A
B
UID
UIE
Description:
Status Bits:
Registers:
This instruction is used to turn of interrupts. If ’A’ is true, then the following
ladder logic will be run without interrupts. If ’B’ is true the
interrupts will be reenabled. These instructions will only be of concern
when using user programmed interrupt functions. These are normally
only used when a critical process may be completed within a given
time, or when the ladder logic between the UID and UIE conflicts
with one of the interrupt programs.
none
none
Available on: PLC-5
www.PAControl.com