Mitsubishi Electric MELSEC-Q Series - Page 190

7 REPLACEMENT OF PROGRAM
7 - 3
(2) Comparison between QnASCPU and QCPU
: Compatible, :Partially changed, : Incompatible
Item QnASCPU specifications
QCPU specifications and
precautions for replacement
Compat-
ibility
Reference
Sequence program
SFC program
• Each program is dealt as one file.
[Specification]
• Each program is dealt as one file.
 –
Instruction
• Dedicated instructions as display
(LED) instruction, status latch (SLT)
instruction, etc. are available.
[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.
Section 7.2
File register
• Data is stored in a memory card.
• One block is set in 32k points unit.
[Specification]
• Data is stored in a standard RAM or
memory card.
• One block is set in 32k points unit.
[Measure]
• Review the setting.
Section
7.7.11
Parameter
• Dedicated parameters for each
CPU are provided.
[Specification]
• Dedicated parameters for each CPU
are provided.
[Measure]
• Check and re-set the parameters since
specifications and functions differ
between the two CPUs.
Section 7.3
Special relay
• 1800 points of SM0 to SM1799 are
provided.
[Specification]
• 1800 points of SM0 to SM1799 are
provided.
[Measure]
• Review the points since some
specifications differ between the two
CPUs.
Section 7.4
Special register
• 1800 points of SD0 to SD1799 are
provided.
[Specification]
• 1800 points of SD0 to SD1799 are
provided.
[Measure]
• Review the points since some
specifications differ between the two
CPUs.
Section 7.5
Comment
• Comments are managed as a
common comment or program
original comment.
[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.)

Section
7.1.2
Writing programs to
ROM
• The boot run is executed with
program and parameter stored in a
memory card.
• One memory card can be installed.
[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.
Section
7.7.12