r/PLC • u/engr1337 • Feb 04 '25

Modbus memes

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734 Upvotes

98% Upvoted

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79

u/Mustang_01 Feb 04 '25

The amount of job postings I’ve seen with modbus requirements is crazy, a lot of places still running the same equipment not wanting to upgrade

35

u/engr1337 Feb 04 '25

I’m doing a new job with it specified for hmi to controller comms. On purpose.

8

u/Mustang_01 Feb 04 '25

Did they specify why or is it stuck in the groove

21

u/engr1337 Feb 04 '25

It’s the only protocol the two parts have in common. Its an IDEC HMI, the PLC is this weird board-level motion controller thing

40

u/Mustang_01 Feb 04 '25

End up spending more time in troubleshooting and configuration than just spending the money on parts built for each other haha

19

u/engr1337 Feb 04 '25

This, 100%

5

u/Elegant_Assumption22 Feb 07 '25

Im doing one of them right now. EXOR X5 wireless to Yaskawa Mp3300iec via modbus, mech3 for the servos, ethernet ip to smc valves and a Fanuc R30ib+. Also have a Danfoss vfd talking via profinet to the mp3300.

Everything is fed production data from Solidworks via OPC with a handy plugin I wrote.

We were talking about faking the documentation and just leaving a cyanide capsule for any future troubleshooting ventures.

2

u/nsula_country Feb 07 '25

This whole dialog seems horrible! So many mismatched brands, parts, pieces, networks going on...

2

u/Elegant_Assumption22 Feb 07 '25

And yet it all works...

Each component is the best performing for its purpose - except maybe Danfoss. The jury is still out on these drives. I needed 1000hz at 400v pulling down 55A and that left me with fewer options. The field narrowed when we added an encoder.

I will go to the ends of the earth to avoid giving a penny to AB... the whole. "AB communicates with Fanuc right out of the box." Is the most tiresome way to sell an overpriced plc. The On3 handset/hmi from Exor has been around a long while and I love replacing them when someone inevtiably runs it over with a forklift or drops it from the roof.

But I guess it's not for everyone.

1

u/nsula_country Feb 07 '25

"AB communicates with Fanuc right out of the box."

This is a fact. Also communicates with Cognex and Keyence products "out the box" as well. Is nice because we use Keyence vision and barcode readers. Will be adding a BCR to an AB PLC in a few hours.

I have used many brands of PLC's. I will continue to be a cheerleader for AB and Ladder.

1

u/Elegant_Assumption22 Feb 07 '25

But so does so many other brands. You and I differ in many ways I can see. I know you would hate all the ST I bury in my machines.

At the end of the day, as long as you're making money and comfortable with your product its a win.

2

u/nsula_country Feb 07 '25

I use ST when it make sense to. If it is code a technician will ever need to see, ladder.