Leer Modbus RTU

[qrm77]

Hola a tod@s, tengo el siguiente pgm intentando leer un equipo slave en modbus.

He comprobado el UnitID, starting adress y el number de holding register, es el correcto.

Pero al ejecutar me da el siguiente error:

SubVIs.lvlib:RTU Data Unit.lvclass:Read ADU Packet.vi:5030001

Alguna idea porqué me ocurre?

Gracias

[ZYOng · Accepted solution]

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@qrm77 wrote:

Hello everyone, I have the following pgm trying to read a slave device in modbus.

I have checked the UnitID, starting address and the holding register number, they are correct.

qrm77_0-1726558794046.png

But when I run it I get the following error:

SubVIs.lvlib:RTU Data Unit.lvclass:Read ADU Packet.vi:5030001

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Error 56 is a generic timeout error. The master didn't get any response from the slave.

Try to run NI I/O Trace and see if the slave responses with any message. You can compare the result from a different master, like QModMaster

[qrm77]

Thank you very much Kudos!! I'll try it.