To view the error list (if not displayed), please follow these steps:

1. Click the down arrow under the Window button in the Windows section of the View menu.

2. Click on 'Error list' in the drop-down menu.

After detecting errors, compilation will inevitably fail. Fix the errors and compile again until there are no errors before compilation can pass.

The main errors come from the following aspects:

1. Error in ladder diagram/instruction table/functional block diagram.

2. C language error in function block.

3. Error in Modbus table.

4. The plane system settings are incorrect.

5. Other errors.

After detecting the warning, the compilation can pass, but be aware of the warning.

The warnings mainly come from the following aspects:

1. Warning for ladder diagram/instruction table/functional block diagram.

2. C language warning for function blocks.

3. Other warnings.