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Problem with Modbus RTU

1/27/2012 8:04 AM	Rate (0)
Miniautomatizace Regular Member Joined: 9/7/2011 Last visit: 6/18/2024 Posts: 8 Rating: (0)	Hello everybody, please I have problem with Modbus RTU communication. I have TIA11 SP2 and CPU 1214 DC/DC/DC FW: V2.1.2 and CM1241 RS485. I need some information (9 words) from register 16 from driver control which has address 1. The right command sequence is #01#03#00#10#00#09#84#09 (everything in HEX format). If I monitor Modbus RTU, so CPU send only #01#03#00#10#00#09 and miss CRC (#84#09). I dont know, where is problem. Do you have some idea? I'm as master and I use MB_MASTER block. If I start REQ block is active but no ERROR and no DONE signal comming. Status "MB_MASTER_DB".STATUS is #0000. Thank you. Frantisek

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1/28/2012 2:46 PM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 2/8/2025 Posts: 1524 Rating: (231)	Hello Miniautomatizace, As you say,thereis no error in the communication link. What is the DATA_LEN (as shown above) you have configured?
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1/28/2012 9:01 PM	Rate (0)
Chilly_Garfield Posts: 316 Rating: (37)	Hi Miniautomatizace, check the length of your pointer! I think you have configured a wrong length. Example: P#DB?.DBX?.? Byte "LENGTH"! If you use a variable please check the right adressing of the variable!
Chilly_Garfield Posts: 316 Rating: (37)
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2/15/2024 3:09 PM	Rate (0)
PanosMich Joined: 3/29/2023 Last visit: 3/7/2025 Posts: 6 Rating: (0)	Hello all, I have the same problem. Did you manage to solve yours?
	Last edited by: PanosMich at: 02/15/2024 15:33:48
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