When uploading a program from one Mitsubishi PLC to another PLC or computer, you may notice that certain sections of the program display a yellow background (as shown in the image). Additionally, the latest version of the Mitsubishi PLC programming software may become unresponsive or fail to function properly. What could be causing this issue? The answer usually lies in the programming method used. Below is a detailed explanation of the possible causes and solutions.
The incomplete upload of a Mitsubishi PLC program can generally be attributed to two main issues:
1. **Programming on a Computer**: If the program contains serious errors during development, it may not compile or download correctly. This can lead to an incomplete or corrupted upload, resulting in parts of the program being missing or displaying a yellow background.
2. **Using a Handheld Programmer (e.g., FX-20P-E)**: When using a handheld programmer, if the overall structure of the program has errors, it may not be written into the PLC at all. Even if it is written, the program might not be fully readable when transferred back to the computer, leading to incomplete uploads and visual anomalies like the yellow background.
To resolve the issue of incomplete program uploads, consider the following solutions:
- When writing a program on a computer, ensure that the number of contact lines does not exceed 24. Exceeding this limit may prevent proper compilation and result in error messages.
- When using a handheld programmer, it is possible to write programs with more than 24 lines without immediate errors. However, when such a program is later read back by a computer, the portion exceeding 24 lines may be lost. This leads to a yellow background in the affected section and indicates that the program size is too large for the computer to handle properly.
It’s important to verify both the structure and the length of your program before attempting an upload. Using the correct tools and following best practices will help avoid these common issues and ensure smooth communication between the PLC and the programming device.
Circuit Breaker Rocker Switches
Circuit Breaker Rocker Switches Gray,Circuit Breaker Rocker Switches Black,Circuit Breaker Rocker Switches Black White,Circuit Breaker Rocker Switches Blue
Yang Guang Auli Electronic Appliances Co., Ltd. , https://www.ygpowerstrips.com