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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
This section describes precautions for replacing the Basic model QCPU or High Performance model QCPU with the 
Universal model QCPU and the replacement methods.
Appendix 3.1.1 Replacing Basic model QCPU with Universal model QCPU
(1)
System configuration
(2)
Program
(To the next page)
TableApp.3 Precautions for replacement and replacement methods (System configuration)
Item
Precautions
Replacement method
Reference
GOT
GOT900 series cannot be connected.
Use GOT1000 series.
---
Applicable products 
and software
Products and software compatible with 
the Universal model QCPU must be used.
Products need to be replaced for the 
compatibility with the Universal model 
QCPU and software need to be upgraded 
for the communication with the Universal 
model QCPU are described in Appendix 
3.2
.
Multiple CPU system
To configure a multiple CPU system, CPU 
modules compatible with the Universal 
model QCPU must be used.
CPU modules compatible with the 
Universal model QCPU are described in 
Appendix 3.2.
TableApp.4  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.
Floating-point 
operation
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.