Modbus TCP

[MichaelMoerix]

Hello 

i have still the problem my Modbus communication has every week an Error. I have connected my SMA Converter with my home network and read data from it. I try to write a program flow if the Error at the communication "Close Port -> WAIT 10 sec. -> Open Port." But i have still the same problem. I can only solve this problem when i close the LabView Program and start again.

The program is in LV2019 32 BIT 

Error 1 occurred at ??? in TCP Master.lvclass:Protocol Write.vi:6190001->IP Data Unit.lvclass:Write ADU Packet.vi:1820001->Modbus Master.lvclass:Read Holding Registers.vi:2420001->_MAIN_Haus.vi
LabVIEW: (Hex 0x1) Ungültiger Eingangsparameter. Wenn am Eingang beispielsweise ein Pfad anliegt, kann dieser Pfad Zeichen wie ? oder @ enthalten, die im betreffenden Betriebssystem nicht zulässig sind.
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Dieser Befehl ist nur verwendbar, wenn der GPIB-Controller der aktive Controller ist.

[GerdW]

Hi Michael,

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@MichaelMoerix wrote:

Error 1 occurred at ??? in TCP Master.lvclass:Protocol Write.vi:6190001->IP Data Unit.lvclass:Write ADU Packet.vi:1820001->Modbus Master.lvclass:Read Holding Registers.vi:2420001->_MAIN_Haus.vi
LabVIEW: (Hex 0x1) Ungültiger Eingangsparameter.

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Where exactly does the error occur?

Which Modbus function raises the error?

Are all inputs for that function really valid?

Why are there local variables visible in the image? Are you sure there is no race condition?

And please keep in mind: we cannot debug/run/edit images with LabVIEW…

[MichaelMoerix]

The function works nearly a week without Error. All Ports are valid it works. But mostly on Sunndy the first VI occure the Error. The local variable implement the IP Adress from the SMA Inverter.

Stupid is i can only reset the error if i close the complete program and restart. with new initialisation Close Open the port it is still the same error.

[GerdW]

Hi Michael,

how often to you open and close the TCP port?

(In case "more than once per EXE run" then I might ask: why more than once?)

[MichaelMoerix]

normally at once if i start the program i open and if i stop the program i close. But if my error occure i try to close and open new the port.

[MichaelMoerix]

Has anyone an idea ?