Mitsubishi Electric MELSEC Q Series Handbook page 190

7
REPLACEMENT OF PROGRAM
(2) Comparison between QnASCPU and QCPU
Item
Sequence program
SFC program
Instruction
File register
Parameter
Special relay
Special register
Comment
Writing programs to
ROM
7
- 3
QnASCPU specifications
• Each program is dealt as one file.
• Dedicated instructions as display
(LED) instruction, status latch (SLT)
instruction, etc. are available.
• Data is stored in a memory card.
• One block is set in 32k points unit.
• Dedicated parameters for each
CPU are provided.
• 1800 points of SM0 to SM1799 are
provided.
• 1800 points of SD0 to SD1799 are
provided.
• Comments are managed as a
common comment or program
original comment.
• The boot run is executed with
program and parameter stored in a
memory card.
• One memory card can be installed.
: Compatible,
QCPU specifications and
precautions for replacement
[Specification]
• Each program is dealt as one file.
[Specification]
• With "Change PLC type", instructions
are converted automatically except
some instructions.
[Measure]
• The instructions that cannot be
converted are changed to SM1255 and
SD1255 for QCPU. Therefore, program
modification is required.
[Specification]
• Data is stored in a standard RAM or
memory card.
• One block is set in 32k points unit.
[Measure]
• Review the setting.
[Specification]
• Dedicated parameters for each CPU
are provided.
[Measure]
• Check and re-set the parameters since
specifications and functions differ
between the two CPUs.
[Specification]
• 1800 points of SM0 to SM1799 are
provided.
[Measure]
• Review the points since some
specifications differ between the two
CPUs.
[Specification]
• 1800 points of SD0 to SD1799 are
provided.
[Measure]
• Review the points since some
specifications differ between the two
CPUs.
[Specification]
• For the QCPU, comments are managed
as common comments or comments by
program. (For the Basic model QCPU,
only comments by program (MAIN) are
managed.)
[Specification]
• Replacement does not need to be
selected for the Universal Model QCPU
as the program memory is flash ROM.
• Boot run of the Universal Model QCPU
can be executed using an SD memory
card.
:Partially changed, : Incompatible
Compat-
Reference
ibility
 –
Section 7.2
Section
7.7.11
Section 7.3
Section 7.4
Section 7.5
Section

7.1.2
Section
7.7.12