When uploading a program from a Mitsubishi PLC to another PLC or computer, users often notice that parts of the program display a yellow background (as shown in the image), and the high-version Mitsubishi programming software becomes unresponsive. This issue can be frustrating and confusing. So, what causes this problem, and how can it be resolved?
In general, this issue is related to the programming method used. Below is a simple yet detailed explanation of the possible reasons behind incomplete program uploads.
The reason for an incomplete upload of a Mitsubishi PLC program can be divided into two main categories:
1. **Programming on a Computer**: If the program contains serious errors during the writing process, it may fail to compile or download properly. In such cases, the program will not be uploaded correctly, and the system might show warnings or errors.
2. **Using a Handheld Programmer (e.g., FX-20P-E)**: If there are structural issues in the program, it may not be written into the PLC successfully. Even if the program appears to be written without errors, the uploaded version may still be incomplete.
In both scenarios, the result is an incomplete program upload, which can lead to unexpected behavior or visual indicators like the yellow background seen in the image.
### How to Fix the Incomplete Upload Issue
Here are some practical solutions to address the problem:
1. **When Programming on a Computer**: Ensure that the number of contact lines does not exceed 24. If it does, the program may not compile, and the system will prompt an error message. Keeping the program within this limit helps avoid upload failures.
2. **When Using a Handheld Programmer**: Programs with more than 24 lines can be written without errors using the handheld device. However, when these programs are later read back by a computer, the excess lines may be lost. As a result, the affected sections may appear with a yellow background, and the program may be considered too large for proper processing.
To prevent this, it’s recommended to either keep the program within the 24-line limit when using a computer or ensure that any program written on a handheld programmer is thoroughly checked before being transferred back to the computer.
By understanding these limitations and following best practices, users can significantly reduce the chances of encountering incomplete uploads and yellow background issues in their Mitsubishi PLC programs.
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