Step instructions and step ladder diagram examples

A, step instructions
(1) the STL: stepstart instructions
(2) RET: step return instructions
Second, step ladder
Figure 1 shows the State transition diagram as shown in Figure 2 can be converted into a step ladder

Figure 1

Step ladder instruction has the following characteristics:
(1) transfer for automatic reset function
(2) allows dual output
(3) the main control functions

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