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Appendix 3 Method of Replacing Basic Model QCPU or High Performance Model QCPU with Universal
Model QCPU
Appendix 3.1 Replacement Precautions
APPENDICES
App - 9
(To the next page)
TableApp.4 Precautions for replacement and replacement methods (Program) (Continued)
Item Precautions Replacement method Reference
Latch setting
If latch ranges of internal user devices are
specified, the processing time is added in
proportion to the device points set to be
latched.
The latch function of the Universal model
QCPU is enhanced.
(1) Large-capacity file register (R, ZR)
(2) Writing/reading device data to the
standard ROM (SP.DEVST and
S(P).DEVLD instructions)
(3) Latch range specification of internal
devices
Change the latch method to the method
described in (1) to (3) above according to
the application.
Section 6.3, Appendix
3.4.4
Interrupt counter Interrupt counter is not supported.
Check the numbers of executions for
interrupt programs on the Interrupt
program monitor list screen of GX
Developer.
Section 6.13.2, 9.2.11
SCJ instruction
When the SCJ instruction is used in the
Universal model QCPU, the AND SM400
(or NOP instruction) needs to be inserted
immediately before the SCJ instruction.
Insert the AND SM400 (or NOP
instruction) immediately before the SCJ
instruction when the SCJ instruction is
used.
Section 6.5.1 in the
QCPU Programming
Manual (Common
Instructions)
JP/GP.SREAD and JP/
GP.SWRITE
instructions
Use of the completion notification device
of the target station specified in D3 when
the SREAD and SWRITE instructions are
used is available. (The Basic model
QCPU ignores the device specified in
D3.)
To get the same operation as the Basic
model QCPU, omit D3 or use the READ
instruction instead of the SREAD instruc-
tion.
Section 8.3.2 in the
QCPU Programming
Manual (Common
Instructions)
ZPUSH instruction
The number of index registers is
increased to 20 for the Universal model
QCPU. The area for saving the data in the
index register with the ZPUSH instruction
is increased as well.
Increase the save area used for the
ZPUSH instruction as needed.
Section 7.18.8 in the
QCPU Programming
Manual (Common
Instructions)
Use of the annunciator
(SET F and OUT
F instructions)
When the annunciator is turned on by the
SET F or OUT F instruction, the
USER LED turns on.
(The ERR.LED does not turn on.)
--- ---
I/O refresh between
programs
I/O refresh between programs cannot be
executed.
Execute I/O refresh at the start or end of
each program with the RFS or COM
instruction.
(When the COM instruction is used, I/O
refresh to be executed can be specified in
SD778 by turning on SM774.)
---
SM/SD
Usage of a part of the special relay and
special register is different.
Replace the corresponding special relay
and special register as described in
Appendix 3.5.
Appendix 3.5
Multiple CPU system
The start address for the user setting area
(auto refresh) in the CPU shared memory
is changed.
If the user setting area in the CPU shared
memory is specified in the program,
change the address for the user setting
area by performing an operation for
replacing a device in GX Developer.
(Example: "MOV D0 U3E0\G192"
"MOV D0U3E0\G2048")
---