Mitsubishi Electric MELSEC-Q00U(J)CPU

502
Appendix 5 Replacing Basic Model QCPU or Qn(H)CPU
with QnUCPU
Appendix 5.1 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 5.1.1 Replacing Basic model QCPU with Universal model
QCPU
(1) System configuration
(2) Program
Item Precautions Replacement method Reference
GOT GOT900 series cannot be connected. Use GOT1000 or GOT2000 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 Page 513, Appendix 5.2.
Page 513, Appendix 5.2
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 Page 513,
Appendix 5.2.
Page 513, Appendix 5.2
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 Page
518, Appendix 5.3.
Page 518, Appendix 5.3
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.
*1
( indicates one of the following;
=,<>,<=,>=,<,>.)
When the floating-point data comparison
instructions are used, modify the program as
described in Page 542, Appendix 5.4.2.
Page 497, Appendix 4.4,
Page 542, Appendix 5.4.2
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.
Page 546, Appendix 5.4.3
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.
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
(4) "Time Setting" specification in the latch
interval setting parameter
*2
Change the latch method to the one described
above according to the application.
Page 122, Section 3.3,
Page 124, Section 3.3 (5)
(b),
Page 550, Appendix 5.4.4