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Maximum number of nodes can be read successfully in practice by CP341 (6ES7341-1CH01-0AE0) using Modbus protocol

6/2/2009 2:45 PM	Rate (0)
Yazdanpanah Posts: 14 Rating: (0)	Dear all, Has anybody tried to read 20 or 32 devicesusing Modbus protocol by CP341? (6ES7341-1CH01-0AE0) If yes, has it been successful in practice? Yours, Farzad
Yazdanpanah Posts: 14 Rating: (0)
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6/2/2009 2:53 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 3/15/2025 Posts: 2957 Rating: (243)	Hi, 22 devices, speed 9600 with parity. 2 and a half years and still successful . Very slow, but working. I mean very long time until request returns back to first device (40-60 seconds, because reading big amount of data).
	Last edited by: Darius at: 6/2/2009 2:55 PM Best regards, Darius
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6/2/2009 3:07 PM	Rate (0)
Yazdanpanah Posts: 14 Rating: (0)	Thank u for your quick reply Darius!
Yazdanpanah Posts: 14 Rating: (0)
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6/2/2009 3:13 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 3/15/2025 Posts: 2957 Rating: (243)	I can say that this was not very long line. It was about 15-20 meters. So it also might affect number of slaves you can read in practice. I have also used terminators on both ends.
	Best regards, Darius
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6/2/2009 3:36 PM	Rate (0)
Yazdanpanah Posts: 14 Rating: (0)	Darius, you say you've read "big amount of data" in 40-60 seconds for 22 devices @ 9600 with parity. Can you remember: 1) How manyholding registersu had in each device, or how many registers did u have in total for the 22 devices approximately, 2) Did youhave adjacentholding registers (I mean holding registers with successive addresses)while reading the devices or there were address gaps? Yours, Farzad
Yazdanpanah Posts: 14 Rating: (0)
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6/2/2009 3:45 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 3/15/2025 Posts: 2957 Rating: (243)	Yazdanpanah 1) How manyholding registersu had in each device, or how many registers did u have in total for the 22 devices approximately, All devices was energu meters and I was querying about 20 (10 words) bytes from each. In fact 3 devices wasn't energy meters and they have 25-30 bytes maybe to read. Yazdanpanah 2) Did youhave adjacentholding registers (I mean holding registers with successive addresses)while reading the devices or there were address gaps? I think only these 3 different devices had address gap. I read them in two times. All other was read in one request if I remember correctly (keep in mind it was 2,5 years ago ).
	Best regards, Darius
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6/2/2009 3:49 PM	Rate (0)
Yazdanpanah Posts: 14 Rating: (0)	Thank u Darius!
Yazdanpanah Posts: 14 Rating: (0)
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