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EXTERN子程序，带参数传送, EXTERN 说明的意义？ | 找知识-找PLC
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  3. SIMATIC S7-300(F)/S7-400(F/H/FH)

EXTERN子程序，带参数传送, EXTERN 说明的意义？

• SIMATIC S7-300(F)/S7-400(F/H/FH)

公司程序:
.........
........ 
N130 EXTERN HEAD_ON(INT)
........
........
HEAD_ON(1)
........
这样写和直接调用如
........
HEAD_ON(1)
........
有什么区别

子程序为：
N100 PROC HEAD_ON(INT HEAD_NO)  
N110 G4 F0.5
N120 STOPRE
......

最佳答案

1,没有参数传递的子程序可以直接调用。

2，在带参数传递的子程序调用时，必须在之前的主程序中使用EXTERN 声明带参数传递的子程序。
 详细内容可以参考编程手册。

提问者对于答案的评价：
带参数传递的子程序，必须使用EXTERN吗？ 不用EXTERN的话是不是就用不起？

最佳答案作者回复:
我可能没有说清楚，针对你这个程序是这样的，不是必须的。你可以看看proc的用法。

原创文章，作者：more0621，如若转载，请注明出处：https://www.zhaoplc.com/plc283019.html

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    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

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    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

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    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357

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