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MELSEC-Q
1 OVERVIEW
Programs stored in the standard ROM/memory card are executed after they
are booted to (read to) the QCPU program memory. (Programs to be booted
to the QCPU are designated on the “(PLC) Parameter" dialog box, and the
parameter drive is designated by a DIP switch setting at the QCPU.)
Boot
Execution of program booted
from the standard ROM or memory
card to the program memory.
Parameter
Program
QCPU
Program memory
Parameter
Program
Standard ROM
Parameter
Program
Memory card
(2) Program construction
Programs are stored in a file format in the program memory, standard ROM or
memory card.
Multiple programs can therefore be stored in the program memory, standard
ROM or memory card by using different file names.
GX
Developer
Multiple program writing
is enabled by using
different file names.
QCPU
Parameter
Writing from GX Developer to QCPU
Program
File name: ABC
Device
comments
File name: ABC
Program
File name: DEF
Therefore, the program creation can be split among several designers so that
they control and manage the programs by process or function.
Only the relevant programs should be modified or debugged when the
specifications are changed.
(a) Example of program creation split among several designers:
Programs A to C
are executed in
sequence. 1
Designer A
Designer B
Designer C
QCPU
Program A
Program B
Program C
Program memory
/ Standard ROM / Memory card
REMARK
1: See Section 4.2 for details on the execution sequence.