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Using FC16 I am unable to write registers in MB slave

12/15/2010 7:21 AM	Rate (0)
Raheel Bronze Member Joined: 8/10/2006 Last visit: 2/13/2025 Posts: 156 Rating: (3)	Hi, Using FC16 I am unable to write registers in MB slave. I am always getting error code 0E47 or 0E40 on master CP. Can you please help. Please note that I am using two CP341-422 RTU as master and slave. Regards, Raheel Splitted from Modbus Master communication.
	Last edited by: O_Moderator at: 12/16/2010 11:22 AM new subject after splitting
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12/15/2010 11:53 AM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 4/15/2025 Posts: 1560 Rating: (540)	These error codes suggest that the LEN parameter is incorrect. If I have read the manual correctly, this should be the number of registers you want to write.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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12/15/2010 12:19 PM	Rate (0)
Raheel Bronze Member Joined: 8/10/2006 Last visit: 2/13/2025 Posts: 156 Rating: (3)	Hello, Below please find my configuration. please note that 0E47 message is on modbus master. Regards, Raheel Attachment MB Config.zip (170 Downloads)

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12/15/2010 3:14 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 4/15/2025 Posts: 1560 Rating: (540)	Reading the manual suggests that the LEN value should be the number of bytes in the packet minus 2 (I assume this is omitting the CRC). This is deduced as follows:- Taking function code 1: Packet length = slave address + function code + start address HI + start address LO + number of data points HI + number of data points LO + CRC HI + CRC LO = 8 bytes). LEN value = 6 (from documentation). Soapplying this to your case:- Packet length = slave Address + function code + start address HI + start address LO + number of data points HI + number of data points LO + force data (58 registers = 116bytes) + CRC HI + CRC LO = 124 bytes. So your LEN value will be 124 - CRC bytes (2) = 122. You have only used a LEN value (116) to cover the force data and not the rest of the modbus packet. So change your LEN value to 122 and see what happens.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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12/16/2010 3:01 PM	Rate (0)
Raheel Bronze Member Joined: 8/10/2006 Last visit: 2/13/2025 Posts: 156 Rating: (3)	OK Thanks. Will try this on Monday and let you know Regards, Raheel

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12/21/2010 6:54 AM	Rate (0)
Raheel Bronze Member Joined: 8/10/2006 Last visit: 2/13/2025 Posts: 156 Rating: (3)	Hi, By changing the LEN parameter it worked in first time. Thanks for all your support. Best regards, Raheel

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