Siemens PLC comparison instruction programming example - Database & Sql Blog Articles

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[Example] Using the plc ladder diagram and the instruction list, the data comparison program that satisfies the following control requirements is compiled in Siemens S7-200 and S7-300/400PLC:
1 When the input I2.0 is "1" (rising edge), compare the size of IW10 and MW20;
2 If IW10 - MW20, the mark Ml0.0 is "1"; IW10> MW20, Ml0.1 is "1"; IW10 3 It is required that the state of M10.O to M10.2 can be maintained even after I2.0 is "0".
The ladder diagram and instruction list program designed according to the requirements are shown in Figure 10-3.4 (S7-200) and Figure 10-3.5 (S7-300/400) respectively.