描述

5SHX0660F0002 plc的選擇主要應(yīng)從機型、容量、i/o模塊、電源模塊、特殊功能模塊、通信聯(lián)網(wǎng)能力等方面加以綜合考慮

plc的選擇主要應(yīng)從機型、容量、i/o模塊、電源模塊、特殊功能模塊、通信聯(lián)網(wǎng)能力等方面加以綜合考慮。plc的容量包括i/o點數(shù)和用戶存儲容量兩個方面。

　　(一)i/o點數(shù)的選擇

plc平均的i/o點的價格還比較高，因此應(yīng)該合理選用plc的i/o點的數(shù)量，在滿足控制要求的前提下力爭使用的i/o點少，但必須留有一定的裕量。

通常i/o點數(shù)是根據(jù)被控對象的輸入、輸出信號的實際需要，再加上10%~20%的余量來確定。

　　(二)用戶存儲容量的選擇

用戶程序所需的存儲容量大小不僅與plc系統(tǒng)的功能有關(guān)，而且還與功能實現(xiàn)的方法、程序編寫水平有關(guān)。一個有經(jīng)驗的程序員和一個初學(xué)者，在完成同一復(fù)雜功能時，其程序量可能相差25%之多，所以對于初學(xué)者應(yīng)該在存儲容量估算時多留裕量。

plc的i/o點數(shù)的多少，在很大程序上反映了plc系統(tǒng)的功能要求，因此可在i/o點數(shù)確定的基礎(chǔ)上，按下式估算存儲容量后，再加20%~30%的裕量。存儲容量(字節(jié))=開關(guān)量i/o點數(shù)×10+模擬量i/o通道數(shù)×100

另外，在存儲容量選擇的同時，注意對存儲器的類型的選擇。

5SHX0660F0002 plc的選擇主要應(yīng)從機型、容量、i/o模塊、電源模塊、特殊功能模塊、通信聯(lián)網(wǎng)能力等方面加以綜合考慮

The selection of plc should be mainly considered from the model, capacity, i/o module, power module, special function module, communication networking capability and other aspects. plc capacity includes i/o points and user storage capacity two aspects.

(A)i/o points selection

The average price of plc i/o points is still relatively high, so the number of plc i/o points should be reasonably selected, and strive to use less i/o points under the premise of meeting the control requirements, but must leave a certain margin.

Usually i/o points are determined according to the actual needs of the input and output signals of the controlled object, plus a margin of 10% to 20%.

(2) The user’s choice of storage capacity

The storage capacity required by the user program is not only related to the function of the plc system, but also related to the method of function realization and the level of program writing. An experienced programmer and a beginner can vary as much as 25 percent in the amount of programs they use to perform the same complex function, so beginners should leave a margin for storage capacity estimates.

The number of plc i/o points reflects the functional requirements of the plc system to a large extent, so it can be determined on the basis of i/o points, and then add 20% to 30% margin after estimating storage capacity according to the following formula. Storage capacity (bytes)= Number of i/o points x 10+ Number of analog i/o channels x 100

In addition, when the storage capacity is selected, pay attention to the selection of the type of storage.

公司介紹：
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Company Introduction:
Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed



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