此文档通过在印染机温度过程控制中的应用,充分说明了PLC在工业集散控制系统中的地位、作用和如何实现最优化的。-This document is through the dyeing machine temperature process control applications, fully illustrated PLC in industrial distributed control system
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001338s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.128526s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001372s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002046s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001460s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005305s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001312s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.007078s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.018965s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001120s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 176928 [ RunTime:0.014570s ]