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1. PLC Development Environment Using GX Developer
1.3 Developing PLC Programs
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(2) Operation to be performed at write error
As soon as a ladder is written from GX Developer to the CNC, the CNC converts it into the CNC-
specific ladder machine code. A conversion error occurs if any of the devices and command formats
not supported by the C64 series is used.
At a conversion error, the CNC side ladder machine code is converted into the [NOP code], the
ladder up to the last step is transferred, and the following dialog is then displayed on the GX
Developer screen.
When the file that resulted in a conversion error is displayed with the [File selection] tab of the
[Read from PLC] screen, the following warning appears in the title field.
“∗∗ WARNING Checksum ERROR!! ∗∗”
If you execute RUN the PLC as-is, an alarm occurs on the CNC side and the PLC does not RUN.
！
CAUTION
！
Do not read a sequence program on which a conversion error occurred into
the GX Developer.
The file may include unexpected contents to result an illegal operation.