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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4: A resume start may be made depending on the SFC program change.
If a resume start is made as-is, a start is made from the old step number, leading to a malfunction of
the mechanical system.
When any SFC program change (SFC diagram correction such as step addition and deletion) has
been made, make an initial start once and then return it to a resume start.
The Basic model QCPU always makes an initial start.
5: The Universal model QCPU makes a resume start in changing programs or any other settings but
SFC programs
POINT
(1) When the PLC is powered OFF or the CPU module is reset, the intelligent function
module/special function module is initialized.
When making a resume start, create an initial program for the intelligent function
module/special function module in the block that is always active or in the sequence
program.
(2) When the PLC is powered OFF or the CPU module is reset, the devices not latched are
cleared.
Make latch setting to hold the SFC information devices.
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