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Created by: kristine at: 5/6/2009 3:14 PM (34 Replies)

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5/25/2009 9:28 PM	Rate (0)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 8/28/2024 Posts: 961 Rating: (124)	Okay, this is the correct DB. I can see that the last order, which was started, is the order DATA_TYPE = 4, START_ADDRESS = 0 and LENGTH = 12 (C hex). In your posting you wrote DATA_TYPE = 1, START_ADDRESS =620 and LENGTH = 2. Also I can see that the DB W#16#D (DB14) is used. This doesn't match with your previous posting! Sorry, but I can't help you if you change the parameters permanently... Wüstenräuber

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5/26/2009 10:31 AM	Rate (0)
kristine Posts: 17 Rating: (0)	Hi sorry about that, forgot to change the parameters back. Here is the instance db where i'amusing data type 1,starting register 640 and length 2. Feel free to recommenda parameterisation what we want: from 192.168.0.2 Read 12registers (input register) Write 2 Coils Write 1 register (holding register) from 192.168.0.3 write 12registers (holding register) read3 Coils(discrete inputs) read1 register (input register) Attachment Testny.zip (740 Downloads)
kristine Posts: 17 Rating: (0)
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5/26/2009 12:35 PM

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Wüstenräuber

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Hi kristine,
Coils has the data_type = 1, but in your instance DB I see data_type = 2, start_address = 280 (hex) and length = 2. This doesn't match! The data_type = 2 is not parameterized in your project.

For the first you have to parameterize:
Read 12registers (input register)
Write 2 Coils
Write 1 register (holding register)

data_type_1	B#16#4	Input Register
db _1	W#16#A	DB 10
start _1	W#16#0	Start address:0
end _1	W#16#11	End address: 11

data_type_2	B#16#1	Input Register
db _2	W#16#B	DB 11
start _2	W#16#0	Start address:0
end _2	W#16#1	End address: 1

data_type_3	B#16#3	Holding Register
db _3	W#16#C	DB 12
start _3	W#16#0	Start address:0
end _3	W#16#0	End address: 0

For the second:
write 12registers (holding register)
read3 Coils(discrete inputs)
read1 register (input register)

data_type_1	B#16#3	Input Register
db _1	W#16#D	DB 13
start _1	W#16#0	Start address:0
end _1	W#16#11	End address: 11

data_type_2	B#16#1	Input Register
db _2	W#16#E	DB 14
start _2	W#16#0	Start address:0
end _2	W#16#2	End address: 2

data_type_3	B#16#4	Holding Register
db _3	W#16#F	DB 15
start _3	W#16#0	Start address:0
end _3	W#16#0	End address: 0

Wüstenräuber

Last edited by: Wüstenräuber at: 5/26/2009 12:36 PM

5/26/2009 7:49 PM	Rate (0)
kristine Posts: 17 Rating: (0)	Hi Thanks for all the help. The problem was that when we changed the value in db_param and downloaded it, the online actual value did not change. we tried turning off and on the plc, resetting memory etc. without any luck. To get it to work we had to deletethe db_param and creat new ones. SoI belive this has been our problem all a long.
kristine Posts: 17 Rating: (0)
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5/26/2009 7:59 PM	Rate (1)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 8/28/2024 Posts: 961 Rating: (124)	Hi, if you change values in a DB, then you have to change it in the declaration view and in the data view. Then you don't need delete and recreate your db. Wüstenräuber

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Help Modbus

Created by: kristine at: 5/6/2009 3:14 PM (34 Replies)

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Created by: kristine at: 5/6/2009 3:14 PM (34 Replies)

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