Modbus Ethernet Slave seems to fail when the Master query information simultaneously for more than 16 Coils or Discrete Inputs.
I'm developing an control application by using the Modbus TCP/IP for communicating with the host computer.
I'm using the Modbus Library for LabVIEW
(http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=F1582737BACF5CA8E0340003BA7CCD71&p_node=DZ52363&p_source=External).
The LabVIEW MB Ethernet Slave seems to fail when the MB Ethernet Master
query information simultaneously for more than 16 Coils or Discrete
Inputs.
The Modbus Application Protocol Specification (http://www.Modbus-IDA.org) state that:
1- The function code 0x01 'Read Coilsis' is designed to read from 1 to 2000 contiguous status of coils in a remote device.
2- The function code 0x02 'Read Discrete Inputs' is designed to read
from 1 to 2000 contiguous status of discrete inputs in a remote device.
To test the behaviour of the LabVIEW MB Ethernet Slave I have modified
the 'MB Ethernet Example Slave.vi' by adding more Coils and Discrete
Inputs. I have added up ONLY to 20 Coils and 20 Discrete Inputs.
By using the 'MB Ethernet Example Master.vi' the answer to the MB query
is correct for the first 16 Coils or Discrete Inputs. Starting from the
17th Coil or Discrete Input the MB Ethernet Slave doesn't give any
answer.
By shifting the start point address the answer remain correct for the first 16 Coils or Discrete Inputs.
I have tested the slave by using also a third part MB Ethernet Master and the behaviour is the same.
1) There is a reason for this behaviour?
2) There is a Modbus Library for LabVIEW that satisfy the 'Modbus
Application Protocol Specification' managing from 1 to 2000 contiguous
status of Coils or Discrete Inputs?
Thanks,
Asper
I have the same problem with the MB Ethernet.
I need 40 Outputs.
The first 16 work perfectly. The next 8 coils do not work, The next 8 work, The next 16 do not work,The next 8 work,The next 24 do not work And work for the last 8. Conclusion, to activate the 40 outputs, I needed 88 coils.
Because 48 coil, do nothing Can someone help me and i cant implemet the jim solution
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Modbus Ethernet Slave coils and discrete inputs
Hi,
I'm having serious problems in the comunication of more than 16 bits for coils or discrete inputs.
In this forum i've read some few post about this matter, tried the possible solution but got nothing working.
Guess that there is some kind of limitation or error in the ModBus modules available at the NI Labview webpages.
The idea is very simple:
I want to be able to sent 32 bits of coils from the ModBus Ethernet Master to the slave and sent 64 bits of discret inputs from the ModBus Ethernet Slave to the Master.
Can someone please give me a push? Im' kind of newbie with the Labview and would apreciate if someone that had this problem resolved could guit me a hint.
My best regards, Jorge
Solved!
Go to Solution.Hi Jorgelopes,
thank's for posting on National Instruments forum.
Can you tell me if you want to communicate with an automate or a computer.
If you do not tried between two computer I suggestion to make the test.
Can you send the VI with which you encounter this trouble?
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