There is no special tool for S7-1200 PLC's to program a sequence application. A method for applying a sequence structure for S7-1200 PLC's using "homemade" function block is presented here. The Function Blocks are made with TIA Portal v.14, and most likely do not work with other versions of TIA Portal.
It is possible to implement sequence programming using other methods, also. A common way is to program a sequence application using SCL language. Each step is programmed with its actions and conditions in a CASE structure.
The method described here is to use a shift register. Each bit of the register corresponds to one sequence step. Each step bit controls the actions of the step. Another register is used to store the conditions of the steps.
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