HIMA F7553工控DCS係統備件模塊_廈門阿米控技術有限公司

產品標題: F7553工控DCS係統備件模塊

型號： F7553

品牌： HIMA

產品詳情資料：

程序執行階段

　　PLC的用戶程序決定了輸入信號與輸出信號之間的具體關係。組成程序的每條指令都有順序號，在PLC中稱為步序號。指令按步序號依次存入存儲單元。程序執行期間，在無跳轉指令時，地址計數器順序尋址，依次指向每個存儲單元，控制器順序執行這些指令。執行指令時先讀入輸入狀態寄存器的狀態，若程序中規定要讀入某輸出狀態，也在此時從輸出狀態寄存器的某對應位讀入，然後進行邏輯運算，運算結果存入輸出狀態寄存器。這就是說輸出狀態寄存器的內容，會伴隨程序的執行而變化（由輸出指令的執行結果所決定）。輸出狀態寄存器的位數與輸出元件數目相對應，所以它又稱為元件映象寄存器。

　　輸出刷新階段

　　在所有的指令執行完畢後，輸出狀態寄存器中的狀態（即輸出繼電器的狀態）在輸出刷新階段轉存到輸出鎖存器鎖存，驅動輸出線圈，形成PLC的實際輸出。

　　在一個周期執行完後，地址計數器恢復到初始值，重復執行由以上三個階段構成的工作周期。

　　雖然可以把PLC看成一個用微處理機實現的許多電子式繼電器、定時器和計數器的組合體；不過需要注意的是PLC與繼電器開關電路在動作順序上的差別。對於繼電器開關電路，全部繼電器的動作可以看成是並行執行的，或者說是同時執行的，而PLC的電器動作是按程序或者說是串行，按周期重復執行的。這使得PLC的輸出對於輸入存在滯後，因此在進行PLC程序設計時，應充分注意它的周期工作方式。

產品英文詳情資料：

Program execution phase

The user program of PLC determines the specific relationship between input signals and output signals. Each instruction that constitutes a program has a sequence number, which is called a step number in PLC. The instructions are stored in the storage unit in sequence by step number. During program execution, when there are no jump instructions, the address counter sequentially addresses each storage unit, and the controller sequentially executes these instructions. When executing an instruction, the state of the input status register is first read in. If the program specifies that an output status should be read in, it is also read in from a corresponding bit of the output status register at this time, and then logical operations are performed. The operation results are stored in the output status register. This means that the content of the output status register will change with the execution of the program (determined by the execution result of the output instruction). The number of bits in the output status register corresponds to the number of output components, so it is also called a component image register.

Output refresh stage

After all instructions are executed, the state in the output status register (i.e. the state of the output relay) is transferred to the output latch during the output refresh stage, driving the output coil to form the actual output of the PLC.

After a cycle is completed, the address counter returns to its initial value and repeats the work cycle composed of the above three stages.

Although PLC can be seen as a combination of many electronic relays, timers, and counters implemented with microprocessors; However, it should be noted that there are differences in the action sequence between PLC and relay switch circuits. For relay switch circuits, the actions of all relays can be seen as being executed in parallel or simultaneously, while the electrical actions of PLC are executed in a program or serial manner, repeating the cycle. This causes the output of the PLC to lag behind the input, so when designing the PLC program, full attention should be paid to its periodic working mode.

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