Mitsubishi Electric MELDAS C6 Programming Manual page 456

Appendix 3. PLC Development Environment using GPPQ
(3) Operation during a Transfer Error
The ladder data is conversed to the ladder machine code characteristic to the C64 controller
simultaneously with the ladder transfer from the GPPQ to the C64 controller. A conversion error will
occur if devices or command formats are used that are not supported by the C64 Series.
During a conversion error, the following message appears at the bottom of the GPPQ screen after
the C64 ladder machine code is converted to an "NOP code" and transferred to the last step.
Communication cannot be carried out with the PC. Error No.=4070
The following warning statement appears in the header statement item when the file having the
conversion error is displayed with the PC file list function.
[List]
:
File
PLCTEST QnA Seq 12345 97-11-18 10:34 [∗∗WARNING: Checksum ERROR!!∗∗]
:
If an attempt is made to run the PLC in this status, the following alarm message will appear on the
NC side, and the PLC will not run.
Q01 Emergency stop PLC
(4) Error Step No. Confirmation Method
The error step can be confirmed using the PC compare function. The mismatched contents appear
as in the following example when the PC comparison is executed. Refer to "Appendix 3.5.4 Ladder
comparison with the C64 controller" for details.
[Sequence Program Diff List]
Step
15
18
22
PgDn : Next page
3.5 PLC Program Development Procedure
Type Size Data
<Memory>
Ins I/O
AND= R4918
K106
+ R4916
K10000
D87
END
No Data exists.
No Data exists.
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Time Title
<PC>
Step Ins I/O
15 NOP
16 NOP
17 NOP
18 + R4916
K10000
D87
22 END
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