Mitsubishi QCPU (Q Mode), Руководство пользователя

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MELSEC-Q
7 FUNCTION
(e) The capacity of a High Performance model QCPU's program file is a sum of
the capacity of the program created and steps used for the write during
RUN. The write during RUN is executed when the capacity of a program file
is increased. If the capacity of a program file becomes larger than what it
was before, steps can be assigned for the write during RUN. This means
that the write during RUN can be executed only when enough space is
available in a user memory area. If steps are assigned again while the write
during RUN is executed, scan time could be extended for a value shown
below in the table. Controls are interrupted for a value shown below in the
table.
Step for Write During RUN
CPU Type
If Not Changed If Assigned Again
QnCPU max. 2 ms max. 30 ms.
QnHCPU max. 1 ms max. 90 ms
(f) High Performance model QCPU does not work correctly, if the following
instructions are written during RUN write.
1) Trailing edge instruction
If the execution conditions of the following trailing edge instructions are
not arranged upon completion of writing, the trailing edge instruction is
executed.
• LDF
• ANDF
• ORF
• MEF
• PLF
2) Leading edge instruction
If the execution conditions for leading edge instructions (PLS instruction
and P instruction) are arranged upon completion of writing, leading
edge instruction is not executed.
The leading edge instruction is executed when the execution conditions
are OFF then ON.
3) SCJ instruction
If the execution conditions of the SCJ instruction are arranged upon
completion of writing, a jump to the designated pointer occurs even in a
scan cycle.