OR-64E0-IPRO0，OR-64E0-IPRO0，OR-64E0-IPRO0
PLC置位與復位指令使用實例
生產實際中，許多情況需要自鎖控制。在PLC控制系統中，自鎖控制可以用置位指令實現。
1 SET指令
SET指令稱為置位指令。其功能是：驅動線圈，使其具有自鎖功能，維持接通狀態。在圖1中，當動合觸點X0閉合時，執行SET指令，使Y0線圈接通。在X0斷開后，Y0線圈繼續保持接通狀態，要使Y0線圈失電，則必須使用復位指令RST。
置位指令的操作元件為輸出繼電器Y、輔助繼電器M和狀態繼電器S。
2 RST指令
RST指令稱為復位指令。其功能是使線圈復位。在圖1中，當動合觸點X1閉合時，執行RST指令，使Y0線圈復位。在X1斷開后，Y0線圈繼續保持斷開狀態。
復位指令的操作元件為輸出繼電器Y、輔助繼電器M、狀態繼電器S、積算定時器T、計數器C。它也可將字元件D、V、Z清零。
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