I can write to Modbus IO server address without create tied variables?

Hi all

I wonder if it is possible to use the Modbus IO server without explicitly create tied variables?

  • If I write a value to the variable "computer/Slave/300001 ni.var .psp://my", the master can appreciate the value.
  • The properties variables paeg says that the variable is related to "My Computer\Slave.lvlib\ModbusSlave1\300001".
  • I deleted the bound variable and tried a few different ways to write directly on the server of e/s, but all of them gave me a 0x8BBB0005 error. I tried the following:
    • NI.var .psp://my computer/Slave/300001
    • NI.var .psp://my computer, Slave, ModbusSlave1, 300001
    • NI.var .PSP://My Computer/Slave.lvlib/ModbusSlave1/300001
    • NI.var .PSP://My Computer/Slave.lvlib/ModbusSlave1/300001

I also tried to replace 'My Computer' with 'localhost' above. No luck.

Is there something I missed? I ask because the CPU usage is very high, and I thought I might be able to reduce that a bit by removing the 300 bound variables in the system.

You can use DataSocket with a path like psp:\\localhost\Slave\ModbusSlave1.400001 for read and write access.

See the example VI "Monitor OPC items with DataSocket.vi" in examples of LabVIEW.

Tags: NI Software

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