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I made successful communication between CP341 - 422 using function code 3. But I am unable to do so by using function code 16

12/14/2010 9:14 AM	Rate (0)
Raheel Bronze Member Joined: 8/10/2006 Last visit: 2/13/2025 Posts: 156 Rating: (3)	Hi, I made successful communication between CP341 - 422 using function code 3. But I am unable to do so by using function code 16. can you kindly help on this. Also what shall be modbus register numbers in case of FC3 and FC16? regards, Raheel Splitted from CPU 313C + CP 341 (modbus slave).
	Last edited by: O_Moderator at: 12/15/2010 10:16 AM new subject after splitting
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12/16/2010 1:23 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 3/10/2025 Posts: 1557 Rating: (540)	Function code 3 and 16 use the same modbus registers. These being holding registers which start at address 40001. If function code 3 works I see no reason why function code 16 does not work. Are you slave or master? Are you getting any errors? If so what are they?
	Last edited by: smiffy at: 12/16/2010 1:23 PM 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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