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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 - 13
(2) Program
(To the next page)
TableApp.10 Precautions for replacement and replacement methods (Program)
Item Precautions Replacement method Reference
Language and
instruction
Some instructions are not supported.
Replace the instructions not supported in
the Universal model QCPU are described
in Appendix 3.3.
Appendix 3.3
Floating-point
operation
The Universal model QCPU performs
program operations of floating-point data
in single precision.
Instructions for floating-point double-
precision operations are added for the
Universal model QCPU. Replace the
instructions if floating-point double-
precision operations ares required, as
described in Appendix 3.4.
Section 2.4.4, Appendix
3.4, Appendix 3.4.2
When using the floating-point data
comparison instructions, LDE ,
ANDE , ORE , LDED , ANDED ,
and ORED , if the comparison source
data are -0, nonnumeric, unnormalized
number, or
, “OPERATION
ERROR “ (error code: 4101) is detected.
( indicates one of the followings;
=,<>,<=,>=,<,>.)
When the floating-point data comparison
instructions are used, modify the program
as described in Appendix 3.4.2.
Device range check at
index modification
When a device number exceeds a setting
range due to index modification,
“OPERATION ERROR” (error code:
4101) is detected.
Deselect the "Check device range at
indexing" checkbox in the PLC RAS tab of
the PLC parameter dialog box so that
checking is not performed.
Section 6.17, Appendix
3.4.3
Program execution
type
Low-speed execution type programs are
not supported.
Use scan execution type programs or
fixed scan execution type programs.
Section 2.3
A program execution type cannot be
changed by remote operation.
Use instructions for switching program
execution types, such as PSTOP, POFF,
and PSCAN.
Section 2.3
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. (For example, if 8K points are
latched for the latch relay (L), the
processing time of 28.6
s is required.)
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