IC200UEX211-B
在SIEMENS S7-200的編程軟件STEP-7中,有專門的比較指令:IN1與IN2比較,比較的數據類型可以是B、I(W)、D、R,即字節(jié)、字整數、雙字整數和實數;還可以有其他的比較式:>、<、≥、≤、<>等等。當滿足比較等式,則該觸點閉合。
與LMODSOFT指令對照:在LMODSOFT中,沒有直接的數的比較指令,但SUB指令可以通過其執(zhí)行減法功能后的三個輸出端的狀態(tài)實現整數的比較功能。
若與LMODSOFT 中的SUB指令對應,則在STEP-7中應有三個比較指令: >、=、< 來分別對應SUB 指令的三個輸出;若還要對應≥、≤、或<>,則根據SUB指令三個輸出端的不同組合,均可找到對應的比較指令。
比如:①(30007)>(40030)
②(30007)=(40030)
③ (30007)<(40030)
①+②(30007)≥
②+③(30007)≤(40030)
①+③(30007)<>(40030)
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