App
- 113
Appendix 5 Method of replacing High Performance model QCPU with Universal model QCPU
APPENDICES
(2) Program
(Continued on next page)
TableApp.49 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 5.3.
Floating-point operation
The Universal model QCPU operates
floating-point data in single precision.
Instructions for floating-point double-
precision operation are added for the
Universal model QCPU.Replace the
instructions if floating-point double-
precision operation is required, as
described in Appendix 5.4.
Section 3.9.4,
Appendix 5.4, Appendix
5.4
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,
and
,
an 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 5.4.
Device range check at
index modification
When a device number exceeds a setting
range due to index modification, an
OPERATION ERROR (error code: 4101)
is detected.
Uncheck the checkbox for "Check device
range at indexing" on the PLC RAS setting
tab of PLC parameter so that checking is
not performed.
Program execution type
Low-speed execution type programs are
not supported.
Use scan execution type programs or
fixed scan execution type programs.
A program execution type cannot be
changed by remote operation.
Use instructions for switching program
execution types, such as PSTOP, POFF,
and PSCAN.
Latch setting
If latch ranges of internal user devices are
specified, the processing time is increased
in proportion to the device points set for
latching. (For example, if 8k points are
latched for a latch relay (L), the scan time
will be 28.6
µs
.)
The latch function of the Universal model
QCPU is enhanced.
(1) Large-capacity file registers (R, ZR)
(2) Writing/reading device data to the
standard ROM (SP.DEVST/
S(P).DEVLD instructions)
(3) Specifying internal devices as latch
ranges
Change the latch method to the method
described in (1) to (3) above according to
the application.
Interrupt program
The interrupt pointer (I49) for the high-
speed interrupt function is not supported.
Consider the use of interrupt pointers for
fixed scan interrupt (I28 to I31).
Section 6.22, Section
6.13.2, and Section
10.2.11
Interrupt counters are not supported.
Check the numbers of executions for
interrupt programs on the Interrupt
program monitor list screen of GX
Developer.
The interrupt pointers due to error
occurrence (I32 to I40) are not supported.
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