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（1）PLC程序的正確性。

正確的程序必須能經得起系統運行實踐的考驗。

（2）PLC程序的可靠性。

●能*保*系統在正常和非正常（短時掉電、某些被控量超標、某個環節有故障等）情況下都能安全可靠地運行。

●能*保*在出現非法操作（如按動或誤觸動了不該動作的按鈕等）情況下不至于出現系統失控。

（3）PLC參數的易調整性好。

經常修改的參數，在程序設計時必須考慮怎樣編寫才能易于修改。

（4）PLC程序結構簡練。

簡練的程序，可以減少程序掃描時間、提高PLC對輸入信號的響應速度。

（5）PLC程序的可讀性好。

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