PLC控制系統一般設計方法：
1、分析控制系統的控制要求
熟悉被控對象的工藝要求，確定必須完成的動作及動作完成的順序，歸納出順序功能圖。
2、選擇適當類型的PLC
根據生產工藝要求，確定I/O點數和I/O點的類型（數字量、模擬量等），并列出I/O點清單。
進行內存容量的估計，適當留有余量。根據經驗，對于一般開關量控制系統，用戶程序所需
存儲器的容量等于I/O總數乘以8；對于只有模擬量輸入的控制系統，每路模擬量需要100個存
儲器字；對于既有模擬量輸入又有模擬量輸出的控制系統，每路模擬量需要200個存儲器字。
確定機型時，還要結合市場情況，考察PLC生產廠家的產品及其售后服務、技術支持、網絡通信

等綜合情況，選定性能價格比好一些的PLC機型。

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