topic Re: Emulation using Modbus TCP in FlexSim Forum

Emulation using Modbus TCP

tom_w3 — Thu, 12 Sep 2019 05:40:54 GMT

[ FlexSim 19.1.1 ]

Hi I am connecting a flexsim model to a Mitsubishi PLC ( with GX3 programming software ). I am using Modbus TCP. The flexsim model and screenshots of my settings are attached.

While the Flexsim 3D model and Process model is running OK, I don't see the changing status of the I/O under monitor mode in my PLC software . I would appreciate any help or advice. Thanks

Re: Emulation using Modbus TCP

joshua_s — Wed, 18 Sep 2019 21:32:05 GMT

@Tom W3

Are you still having issues connecting?

Re: Emulation using Modbus TCP

tom_w3 — Thu, 19 Sep 2019 01:02:49 GMT

Hi Joshua, it ok now. Thanks. Somehow there seems to be an offset between "write to" address declaration in Flexsim and the PLC. Meaning in Flexsim, Photosensor writes to address #1 but it actually triggers X0 in the PLC. its working now . But is there really such an offset in address ?

Re: Emulation using Modbus TCP

tanner_p — Thu, 05 Mar 2020 20:20:50 GMT

Tom,

Sorry about the delayed response. I don't have an answer to your follow-up question about the address offset. This could be something FlexSim related, but we've never tested FlexSim against a Mitsubishi PLC or the GX3 programming software, so it's hard to say. I'm glad you've figured out the issue, though.

Re: Emulation using Modbus TCP

_3gsimulator — Tue, 08 Nov 2022 15:57:19 GMT

Hi @Tom W3 I react to your question related to connectivity over modbus and I hope, you might help me. I want to connect Flexsim to PLC Misthubishi melsec IQ-R.

Data PLC to computer looks correct

But Flexsim read data wrong. Instead of reading 0 and 1, there are values like

on other computer, I can not read nothing in Output Console.

Do you know why?

Re: Emulation using Modbus TCP

Jeanette_Fullmer — Tue, 08 Nov 2022 19:58:03 GMT

Please start a new post for your question. You can link this post to your new one and you can tag users in your new post who are relevant.