Labview Modbus Code Code Seems To
This code seems to be associated with the MB Serial Master Query sub VI. The code works as desired for a while, but will intermittently stop executing and give a timeout error, code 6101. I am trying to acquire data from an instrument using MODBUS RTU protocol. The Protocol is implemented by Labview G Code and Display the all. Modbus TCP/ip data packet Modbus/TCP sets up connections between nodes on the network. For more information about this help file, refer to the following topics: Using Help Important Information Technical Support and Professional Services To comment on National Instruments documentation, refer to the National Instruments.
Are you getting popup error messages for this timeout? Don't forget to wire up your error wires! Don't use a shift register but just regular tunnels for the error wire otherwise if an error happens once, it will prevent the modbus read/write from ever executing properly again.You could put the modbus read in its own loop. In case it's useful, I've posted a simple version of code which generates the problem. My question: is there a coding trick i can use to reconnect in the event that a corrupt signal occurrs (or some other problem which results in the intermittent appearence of the error 6101)? I've increased the timeout value on the MB Serial Master Query sub vi, but this hasn't helped. I am now having the problem with an RS 485 line in the noisy environment, which should be very stable in noisy environemnts. Removing the USB cable from the noisy environment eliminated the problem.
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