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8/18/2007 12:16 PM | |
Posts: 2 Rating: (0) |
Hi all, I have one CPU 226 and one CPU 224 working as a modbus master and a modbus slavem,respectively. For programming a modbus master(slave) device , i've used Modbus Master(Slave) Protocol libraries version 1.1 and 1.0 . I now can write from a master to slave ( write data to V memory registers and to output image registers(discrete output points) ) however when i tried to use read functions, i got failures.I dont know why ? I attached my program for master below so can anyone suggests me an idea? I've been stuck since 3 days ago , hic hic. Many thanks! Attachment226 Modbus Master (read function).zip (182 Downloads) |
10/7/2009 7:21 AM | |
Joined: 3/21/2006 Last visit: 9/10/2024 Posts: 10228 Rating: (1181) |
Hello Pramod, You could use only "read part" example plus instructions from http://support.automation.siemens.com/WW/view/en/27832511. You could build by yourself all read/write program. Regards, Hristo Mihalev |
Last edited by: O_Moderator at: 10/7/2009 9:09 AMlink edited |
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