实例讲解西门子S7-300.400 PLC编程与应用-畅读网

　　　　

实例讲解西门子S7-300.400 PLC编程与应用

作者：曹小燕

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mobi/epub/pdf/awz3

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计算机网络 >> 软硬件开发

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内容简介:

本书从实际工程应用和教学需要出发，以西门子S7-300/400 PLC为例，系统介绍了PLC的硬件资源、指令系统、编程环境及网络通信等基础知识，并通过综合实例详细阐述了采用PLC进行控制系统设计的一般过程和方法。本书内容系统实用，采用图、表、文相结合的方式，使书中的内容通俗易懂又不失专业性。

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CONNECT:[ UseTime:0.000912s ] mysql:host=127.0.0.1;port=3306;dbname=mq;charset=utf8mb4
SHOW FULL COLUMNS FROM `ls_goods_category` [ RunTime:0.001613s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.001408s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 2 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.001396s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 3 ORDER BY `sort` DESC [ RunTime:0.001065s ]
SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.001807s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`link`,`module`,`is_show`,`is_recommend` FROM `ls_nav` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.000951s ]
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SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.002076s ]
SELECT * FROM `ls_friendly_link` WHERE `is_show` = 1 AND `del` = 0 ORDER BY `id` DESC,`sort` DESC [ RunTime:0.000870s ]
SHOW FULL COLUMNS FROM `ls_goods` [ RunTime:0.001400s ]
SELECT * FROM `ls_goods` WHERE `id` = 137729 AND `status` = 1 LIMIT 1 [ RunTime:0.002103s ]
UPDATE `ls_goods` SET `click_count` = 79 , `update_time` = 1756994227 WHERE `id` = 137729 [ RunTime:0.001125s ]
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SHOW FULL COLUMNS FROM `ls_ad` [ RunTime:0.001130s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 35 LIMIT 1 [ RunTime:0.000755s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 11 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.000934s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 14 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.000788s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1756994168 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:0.500679s ]

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