You can trigger through communication Modbus TCP/IP PLC data acquisition without using a loop for?

Hello

I am trying to contact a facility through a Modbus TCP/IP communication PLC. I'm new to this method, but the idea is that the installation will send the logical (Boolean) values 1 bit by ethernet to my workstation which read and then will begin data acquisition. Basically, I need a triger to come to my pc. I placed my vi inside a structure case T/F which will run according to the signal, it receives data acquisition. However, for it constantly waiting, I put this in a loop for. The works of vi, but playback signals sometimes lagging behind due to the loop for. If I take the loop out and just run labview permanently, it works perfectly, but I know that the option is only for debugging and should not be used. So my question is, is there a better way to wait for an incoming signal?

Hello!

Please note that the order of execution of the write operations on the shared variable 000002 is not determined.

For example, nothing prevents this order of execution:

(1) value false 000002

(2) set to true 000002

(3) execution of the loop

In what concerns the delay, you might consider placing a waiting vi in the case of 'false', or the loop uses 100% of CPU if I'm not mistaken...

Kind regards

Marco

Tags: NI Software

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