Data type, variable declaration, global variable and i/o mapping of PLC programming basis (CoDeSys)

This article gives you a comprehensive introduction CODESYS Basic knowledge of programming （ Data types and variable declaration methods , Including global variables and local variables , Power down hold variable 、I/O Mapping, etc. ）,CODESYS Binary data types and identifier naming rules （ Variable naming rule ）. The text will give CODESYS Hetu 、 Mitsubishi PLC Comparison of differences in interface declaration , So that you can understand . Limited to my level , There are inevitably mistakes and deficiencies in the text , Welcome criticism . Thank you for your kind attention .

1、CODESYS Suggest naming rules

2、 Binary data type

3、CODESYS How to open the help assistant ？

The input assistant can provide all program elements inserted at the current cursor position . Open method ：  " edit " --->   " Entry Helper " Or press F2.

4、 How to open tooltips ？

If when calling a function block or function , by POU Parameter input open brackets ,CODESYS A tool tip will be displayed . Tooltips include relevant parameters in POU The information stated in , If it's accidentally shut down , It can be used "Ctrl+Shift+ Space bar " Reopen the function .

5、 Variable declaration and initial value attached

 6、CODESYS Static change