Mitsubishi Q Series Programming Guide

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6 SFC PROGRAM EXECUTION
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.
Note that the Basic model QCPU and Universal model QCPU always makes an initial start.
POINTS
(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.

Mitsubishi Q Series Specifications

General

I/O Points	Up to 4096 points
Communication	Ethernet, RS-232, RS-485
I/O Modules	Digital, Analog, Specialized
Programming Language	Function Block Diagram, Structured Text
Power Supply	24V DC, 100-240V AC
Operating Temperature	0°C to 55°C
Shock Resistance	147 m/s2 acceleration, 3 times in each of X, Y, and Z directions
Program Capacity	Up to 252K steps