As the poor support for structure text programming in plc world(code snippet), here are some short key for it I used with autohotkey.
It’s good for your healthy, enjoy it.
Brief definition:
Found on the Internet:
Generally, I’ll layout the plc program as :
I’d like to centralization the mode control in one state machine, as shown in the figure:
If it is a simpler system, it will be simplified to only manual/automatic switching, or execute according to individual needs.
Of course, the actions of each station are also processed by their own state machine. In automatic mode, the role of the main state machine is only to evoke the status of whether each station needs to perform an action and check completion.
The indexing table basically has only two states:
And each station basically has two types,
As shown in the figure above, St1 can pre-act while rotating, while St2 can only be acted after it is in place.
In fact, sometimes its more intuitive to use the ladder style, but the advantage of ST is that it is convenient to write automatic code generator, It can shorten a lot of time during development.
Pay attention to when writing ST:
ST writing recommendation reference:PLC結構化文本設計模式和算法_rediculous的專欄-CSDN博客_plc結構化文本編程
簡要定義：
網路上找到的：
一般我會把plc程式的架構切分如下：
手/自動模式的管理，我習慣由統一的狀態機來執行，如圖：
若是較簡單的系統，就會簡化成只有手動/自動的切換，或依各別需求執行。
當然，各站別的動作也是自己的狀態機處理。自動模式時，主狀態機的作用只在喚起各站是否需要執行動作及判斷完成等狀態。
圓盤基本上只有兩個狀態：
而各站別基本上有兩種類型，
如上圖，St1屬於轉動中可偷跑的，而St2屬於到位後才能作動的。
其實有的寫法用ladder的型式去表現會較直覺，但是ST的好處在於方便寫程式碼自動產生器，在開發時能夠縮短不少時間。
寫ST時要注意：
In general, we use “Ctrl + L” or “Ctrl + G” to track our ladder program, which is great, but it would be better if we use the label feature in simple project.
ps: Label feature will slightly slow down compilation speed.
