Siemens PLC's special contacts and coils - Solutions - Huaqiang

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As shown in Table 9-1.1, the Siemens S7 series PLCs include not only standard contact symbols found in most PLC systems but also some unique and specialized symbols. These special symbols are explained below for better understanding.


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For example, consider the symbol representing "instruction execution result less than or equal to zero." The program logic is illustrated in Figure 9-1.4. In this example, when I/O point I0.0 is set to 1, the operation "MW10 - MW20" is executed. If the result of this subtraction is less than or equal to zero, then the output Q0.0 will be set to 1.


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