3/11/2015 2:19 PM | |
Joined: 10/17/2011 Last visit: 7/19/2022 Posts: 148 Rating:
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Dear Experts, i want to communicate im151-8 pn/dp as a modbus(RS 485 RTU) slave. I am using cpu and 1SI Module 6ES7 138-4DF11-0AB0, it is configured as mosbus slave i am Using software STEP 7 Professional V12 for testing I am using Modbus tester as a master, when i send query from modbus tester, RX led gets on, but in program, S_MODB gives error info as 16#0811 i am not getting its meaning in any manual. please help, how to resolve. Thanks in advance.
Damayanti
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Last edited by: Min_Moderator at: 3/11/2015 3:28:16 PMNew subject after splitting |
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3/11/2015 8:40 PM | |
Posts: 3093 Rating:
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Hello Damayanti, Error 0811 means character frame error. So the parameterization of data bits / stop bits / paritiy is wrong or you connected R(A) and R(B) vice versa. Regards, |
3/12/2015 10:13 AM | |
Joined: 10/17/2011 Last visit: 7/19/2022 Posts: 148 Rating:
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Dear Sir, thank you for your support. CP START signal was not pulse but a continuous on signal, i made it as pulse signal, now there is no any error. I am using modbus tester as modbus master, when I send query from it, RX led lits, but at modbus tester end i am getting "TIME OUT" Error and no any data is received to read flags say M0.0 to m0.7, which data type to be used and what will be starting address? in conversion DB, START address for flag is "0" i am using Software STEP7 PROFESSIONAL TIA V12 I have attached my program copy. please help. Thank you. Damayanti AttachmentProject3.zip (102 Downloads) |
3/13/2015 5:11 PM | |
Joined: 10/17/2011 Last visit: 7/19/2022 Posts: 148 Rating:
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Hey, Its done in simatic manager. Will try with TIA tomorrow.. Thank you all. Damayanti |
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