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bttimx
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樓主  發(fā)表于: 2019-10-01 00:38
圖片：
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var_wd := LEFT(D4100, K5);
為什麼這行出錯 已經(jīng)指定為string
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1樓  發(fā)表于: 2019-10-12 10:07
len 和 LEFT 是MELSEC函數本身都是無(wú)參數返回，不像IEC函數本身可以返回參數。
MELSEC函數寫(xiě)法：
LEN( ?BOOL_EN? , ?STRING_s? , ?ANY16_d? );
LEFT( ?BOOL_EN? , ?STRING_s? , ?ANY16_n? , ?STRING_d? );

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