Modbus examples

[unclebump]

I'm curious if this could be setup in mailbox mode like an opc server, or does it have to be query/response. I have a setup with momentum plc's, on ethernet, that uses the I/O scanner feature in the plc config. The plc continually transmits data to the opc server as part of the logic scan. It requires no plc logic to transmit data. Almost like turning labview into a remote I/O drop on a network. That would be really cool.

[unclebump]

You have to be careful when using this library. The query vi's do not close the VISA session after they are executed. I have my serial port locked at the moment. Time to reboot.

[tst]

It's probably too late now, but if I remember correctly, you don't need to reboot after not closing a VISA session, only to restart LV.

[unclebump]

Here is a serial read multiple holding registers example. Data values are then put into a graph. 7.0 format

[unclebump]

Here is a modbus ethernet query for holding registers.

[parthabe]

Sorry for replying in an old thread...

I was searching for Modbus examples, I came across to this post.

tst,

I masscompiled the folder of VIs you posted to 8.5 & all of a sudden, some are broken. I dont know why...

unclebump,

The 2 VIs you posted miss some subVIs. Can you repost them now?

[tst]

Try this. It's supposed to be the original 7.1 LLB.

[parthabe]

Thanks, tst!