PLC的掃描周期是每執行一遍從輸入到輸出所需的時間。
工作過程是：
1、輸入現場信號：在系統軟件的控制下，順次掃描各輸入點，讀入各輸入點的狀態；
2、執行程序：順次掃描用戶程序中的各條指令，根據輸入狀態和指令內容進行邏輯運算；
3、輸出控制信號：根據邏輯運算的結果，輸出狀態寄存器（鎖存器）向各輸出點并行發出相應的控制信號，實現所要求的邏輯控制功能。
產品列表：
AS-9900-140
AS-C484-164
AS-9000-451
AS-584L-251
AS-D285-036
AS-506P-005
AS-984B-928
AS-506P-F16
AS-C484-063
AS-584M-220
AS-M909-001
AS-M909-021
AS-D013-000
AS-D013-200
AS-BADU-212
AS-BADU-206
AS-BADU-257
AS-BADU-214
AS-BADU-205
AS-B244-001
AS-B245-001
AS-B231-501
AS-B820-008
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