本软件是用VB制作的，用于电脑与西门子S7-200PLC(PPI协议)进行通讯，如果您想用VB开发S7-200PLC(PPI协议)上位机控制界面，此软件是您的好帮手！
1、可以写入、读出寄存器的数值（字节、字、双字）；
2、可以进行元件（V、M、S、Q、I）的置、复位操作；
3、可以读取元件（V、M、S、Q、I）的ON/OFF状态。
4、可以控制PLC的运行、停止。-A simple application of Visual C++
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001228s ]
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:0.081613s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001045s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001102s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000985s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003022s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000899s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003584s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014219s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001065s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 88803 [ RunTime:0.018191s ]
