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Data addressing modbus

Created by: PHS at: 3/4/2013 5:42 PM (4 Replies)

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PHS Silver Member Joined: 9/19/2009 Last visit: 10/20/2024 Posts: 459 Rating: (85)	Hi everybody I have one doubt with data addressing modbus. Example from user manual: DB_1...............................\|............. W#16#A(10) START_1.........................\|............. W#16#1(1) END_1............................\|............. W#16#8(8) DB10 Address.........\|.......Name........\|.....Type........\| +0.0..............\|..Register 1.......\|...WORD.......\| +2.0..............\|..Register 2.......\|...WORD.......\| +4.0..............\|..Register 3.......\|...WORD.......\| +6.0..............\|..Register 4.......\|...WORD.......\| ... +14.0..............\|..Register 8.......\|...WORD.......\| I don´t know if Register 1 is holding Register 40001 to 40008 or Input Register 30001 to 30008. How can I know it? True, from INPUT_HOLDING meants that is Input Register? and If i need to read Discrete Inputs 10001 to 10008, How I must to set up? With s7 Open Modbus there is DATA_TYPE where 03 is holding register, but here I must set up START_ADDRESS,LENGTH,TI,UNIT,WRITE_READ and INPUT_HOLDING. Thanks advanced
	Last edited by: JM76 at: 3/4/2013 5:51 PM If my answer help you, use the Thanks or Rate Button, It is free of charge :-) The Powerful of WinCC I share my knowledge here: SCADA WinCC My contribution to the forum Library for WinCC
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3/4/2013 9:19 PM	Rate (0)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 8/28/2024 Posts: 961 Rating: (124)	Hi, INPUT_HOLDING? This was a parameter in a very, very old version of Modbus/TCP CP. But it is not available anymore. With this version it's not possible to transfer coils. We should not talk at cross-purposed: Which version of Modbus/TCP do you have? Which version do you want to use? What do you need to transfer? db_1, start_1 and so on are initialization parameters. They define the register area, which the block can be managed. START_ADDRESS, LENGTH and so on are runtime parameters. With these parameters you define the current telegram. Wüstenräuber

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3/4/2013 10:23 PM

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*PHS*

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Wuestenraeuber
Hi,
INPUT_HOLDING? This was a parameter in a very, very old version of Modbus/TCP CP. But it is not available anymore. With this version it's not possible to transfer coils.

Thank you!!! That was I didn´t understand, how was possible to read coils

Wuestenraeuber

We should not talk at cross-purposed: Which version of Modbus/TCP do you have? Which version do you want to use? What do you need to transfer?

We have CP 343-1 6GK7 343-1CX10-OXE0 Firmware V2.0 and the purpose is to read information from Rosemount 3420 (very old) . This have several devices in fieldbus, 4-20 mA devices. I was looking for information and I found the user manual Open Modbus Communication CP 343-1 and CP 443-1 and I was reading I don´t understant, how was possible read coils. Now with your answer I know that isn´t possible with the user manual that I was reading

Wuestenraeuber

db_1, start_1 and so on are initialization parameters. They define the register area, which the block can be managed.
START_ADDRESS, LENGTH and so on are runtime parameters. With these parameters you define the current telegram.
Wüstenräuber

Yes, I know that, I saw another post from you where you said that

Then my question is with thatModbus/TCP CP (2XV9 450-1MB00) can I read coils? Or what version I need for that.

CP343-1
Blockwith
AG_CNTRL
Block without
AG_CNTRL

6GK7 343-1CX10-0XE0 (*)
Yes (from FW V2.1)
Yes (up to FW 2.0)

Thanks you and sorry for my english

Last edited by: JM76 at: 3/4/2013 11:12 PM

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3/5/2013 8:16 AM	Rate (0)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 8/28/2024 Posts: 961 Rating: (124)	Hi, yes, with the current version of Modbus/TCP CP (2XV9 450-1MB00) you can read coils. The version ist V4.3. If you have the software, then you must use the blocks with AG_CNTRL (from the "Current" folder in the library). Wüstenräuber

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3/5/2013 9:52 AM	Rate (0)
PHS Silver Member Joined: 9/19/2009 Last visit: 10/20/2024 Posts: 459 Rating: (85)	Thank you very much.
	If my answer help you, use the Thanks or Rate Button, It is free of charge :-) The Powerful of WinCC I share my knowledge here: SCADA WinCC My contribution to the forum Library for WinCC
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Data addressing modbus

Created by: PHS at: 3/4/2013 5:42 PM (4 Replies)

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Created by: PHS at: 3/4/2013 5:42 PM (4 Replies)

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