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Problems in communication CP 341 and Modbus master V3.1

1/31/2006 9:26 AM	Rate (0)
kukukk Posts: 133 Rating: (5)	Hello! I have a CP 341 - RS232C, with Modbus Master V3.1, and I want to communicate with an Algodue power meter, using the modbus protocol. I made the configuration in HWConfig, I downloded the loadable driver: S7WFPA1X. Using the example program from Step7/Examples/zXX21_04 I tried the communication, but without result. When I set M120.7 => DB40.DBX0.0 is 1 (Send_Req), but there is nothing sent, and the result of FB8 (P_SND_RK) is Complete With Error, and the Status is: 3652 (E44 hexa). The TXD led is not active, when the program is running, and tried to communicate. The SF led on CP341 is not active. What's wrong? I have put the Hardware Key in CP341 Module. Where can I found a detailed description about the FB7, FB8 functions? In the diagnostic buffer of CP 341-RS232C appear this message: "The value of the transferred parameter Amount of Bits is not within the range 1 to 2040. Incoming event" Thanks in advance, Balogh Szabolcs
kukukk Posts: 133 Rating: (5)	Last edited by: CS Moderator at: 1/31/2006 11:08 AM Last edited by: kukukk at: 1/31/2006 10:30 AM Last edited by: kukukk at: 1/31/2006 9:27 AM
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1/31/2006 4:15 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 11/11/2024 Posts: 4351 Rating: (1452)	Hi, A good documentation sources are the Modbus Master Manual and the CP341 Manual. Links: http://support.automation.siemens.com/WW/view/en/1117397 And http://support.automation.siemens.com/WW/view/en/1220184 Look if you do not send a Len = 0 or if the sent DB has no error in his the Header.
	Denilson Pegaia Siemens Industry Sector Technical Support
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