PLC執行程序的過程分為三個階段，即輸入采樣階段、程序執行階段、輸出刷新階段，PLC的掃描工作過程:
（1）輸入采樣階段。在這一階段中，PLC以掃描方式讀入所有輸入端子上的輸入信號，并將各輸入狀態存入對應的輸入映像寄存器中。此時，輸入映像寄存器被刷斷。在程序執行階段和輸出刷新階段中，輸入映像存儲器與外界隔離，其內容保持不變，直至下一個掃描周期的輸入掃描階段，才被重新讀入的輸入信號刷新。可見，PLC在執行程序和處理數據時，不直接使用現場當時的輸入信號，而使用本次采樣時輸入到映像區中的數據。一般來說，輸入信號的寬度要大于一個掃描周期，否則可能造成信號的丟失。
（2）程序執行階段。在執行用戶程序過程中，PLC按照梯形圖程序掃描原則，一般來說，PLC按從左至右、從上到下的步驟逐個執行程序。但遇到程序跳轉指令，則根據跳轉條件是否滿足來決定程序跳轉地址。程序執行過程中，當指令中涉及輸入、輸出狀態時，PLC就從輸入映像寄存器中“讀入”對應輸入端子狀態，從輸出映像寄存器“讀入”對應元件（“軟繼電器”）的當前狀態。然后進行相應的運算，運算結果再存入輸出映像寄存器中。對輸出映像寄存器來說，每一個元件（“軟繼電器”）的狀態會隨著程序執行過程而變化。
（3）輸出刷新階段。程序執行階段的運算結果被存入輸出映像區，而不送到輸出端口上。在輸出刷新階段，PLC將輸出映像區中的輸出變量送入輸出鎖存器，然后由鎖存器通過輸出模塊產生本周期的控制輸出。如果內部輸出繼電器的狀態為“1”，則輸出繼電器觸點閉合，經過輸出端子驅動外部負載。全部輸出設備的狀態要保持一個掃描周期。
主營產品：Schneider ,Foxboro,Ovatin,Allen-Bradley,Siemens等各類工控產品，
咨詢！
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Ge FANUC A05B-2452-C200 A06B-6105-C901 NEW
GE FANUC A03B-0801-C058 RC01A ROBOT CONTROL MODULE
GE FANUC A14B-0076-B324 A16B-1310-0530 POWER INPUT UNIT
FANUC A81L-0001-0133 NEW
Ge FANUC IC600YB802B IC600YB802 NEW
GE FANUC A20B-2900-0101/?03A A20B-2900-0101 CONTROL
GE FANUC BOARD 44A398774-G01 44A398774G01
FANUC ROBOTICS ME-5154-040-14A CABLE NEW
FANUC ROBOTICS EE-3186-317-001 P-10 EOAT E0AT CABLE
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GE FANUC IC600YB911C IC600YB911 NEW
GE FANUC A860-0360-V501 ALPHA A64 PULSE CODER
GE FANUC HORNER HE-XE102DD HE-XE102
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ELCOMETER 217 HYGRO-THERMOMET?ER
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Ge FANUC IC610PER154E IC610PER154 PROM WRITER
GE Fanuc A660-2004-T682 LR003 CABLE
GE Fanuc A16B-1310-0660/?02A A16B-1310-0660 BOARD
UNIOP CP01R-04-3642 CP01R SCREEN
