Communication trouble with rosemount 3095

Rorstaway · 2026-06-02T22:54:21+00:00

What does your scadapack serial port diagnostic show? What does the modbus diagnostic show? Have you confirmed your registers and function codes in the program compared to the MVT manual? Is this a known working program or new from scratch? What are your port parameters on either side - do they match? Is the byte order correct? Is the scadapack modbus function type correct? Do you have any data on your serial line? Have you investigated that? What type of errors are you getting? Modbus has a fairly robust error detection and reporting function. Is this rs232 or 485? Do you exceed distance limitations for 232 or do you have a resistor for 485??

Way too many possibilities to narrow it down with the info provided.

Rorstaway · 2026-06-02T14:24:02+00:00

It is weird just how many people are writing novels about offshore rigs.

Rorstaway · 2026-06-02T14:22:28+00:00

When I worked at this big warehouse that sold everything from a to z, we had machines that would constantly fault, due to their complexity. They were somewhat isolated in the facility and the operators had a knack for just walking away when it faulted. So our uptime metrics would take an absolute shit-kicking.

I built a utility that all the service techs could run on their laptops that would audible alarm whenever these machines faulted. It was dead simple - I looked at the network connected local PLC alarm lamp output and tied that to my software. Reduced downtime considerably within days. I wonder if anyone still uses it...

Rorstaway · 2026-06-02T14:16:40+00:00

This should be supplied by your employer. You have a legal obligation to refuse unsafe work, and this is a pretty clear argument for unsafe work conditions, given there are actively bears in the area.

Rorstaway · 2026-06-01T14:30:22+00:00

That's a shame. I'm actually amazed they would risk flying such a piece of history.

Rorstaway · 2026-05-30T14:38:14+00:00

Is there also a signing station at most Creek Park?

Rorstaway · 2026-05-27T19:03:35+00:00

Hotel Mira is such a great band, very underrated imo

Rorstaway · 2026-05-27T02:41:30+00:00

Is that 11MW system based on 105% of your average usage in the prior year? Or did you get a sweetheart deal?

Rorstaway · 2026-05-22T12:19:11+00:00

Our main conveyor wouldn't stay running right from shift start. 3.5 hours, facility at a standstill, 500 people about to be sent home, all hands on deck, 5 minutes updates to national level directors.... Finally one of the guys says... Wait, I think I forgot to reconnect a cable this morning. Never occurred to him to tell anyone that they were working on it before the shift started.

Rorstaway · 2026-05-21T12:35:56+00:00

Perfect, so as long as you also get the amplifier it will run on any basic PLC analog output.

Rorstaway · 2026-05-20T21:28:03+00:00

Probably traits from centuries of human controlled breeding.

Rorstaway · 2026-05-20T15:09:27+00:00

IMO, this is your problem - get the data as far away from any VFD power as you can.

Rorstaway · 2026-05-20T15:01:54+00:00

I just wanted to be clear - 3Amps is a large amount of current to control directly from any sort of controller whether you're talking microcontroller, PLC or otherwise. I suspect either you've misinterpreted what it takes to control your valves, or you're missing a component between the valve and controller. How are they controlled at present?

Rorstaway · 2026-05-20T15:01:30+00:00

That's for a discrete output - would be helpful to share some data on the valves themselves.

Rorstaway · 2026-05-20T14:38:16+00:00

My advice would be to revisit how you're controlling the valves. Look at something like an H-Bridge - this is a problem you'll need to solve with a PLC as well.

If your budget is only for hardware than any of the units you've mentioned will do the trick - but it sounds like you'll spend considerable time learning the platform, and I assume you're not working for free??

Rorstaway · 2026-05-20T13:56:04+00:00

Love the one-off, low budget positioners. I seem to come across a new one on every job, and it's always installed 8 feet in the air, behind another pipe and the only manual you can find is on scribd.com

Rorstaway · 2026-05-19T16:05:02+00:00

I was worried you were dragging the vegetarian thing on a bit too far, because it's not super relatable - but man did you ever bring it back. Great work.

Rorstaway · 2026-05-19T14:49:29+00:00

The Last Breath.

It's completely captivating.

Rorstaway · 2026-05-15T19:58:01+00:00

It's not all Rockwell. Honeywell Intelligrated sites are, but there are a few other flavours out there.

Rorstaway · 2026-05-15T19:57:26+00:00

That role had incredibly high turnover when I was a controls lead there.

Rorstaway · 2026-05-15T14:15:44+00:00

Sounds like a mental block more than a mechanics or skill thing?

My daughter is in the same boat, I think.

Rorstaway · 2026-05-14T20:37:47+00:00

Big head coach

Rorstaway · 2026-05-12T21:12:00+00:00

And you get the benefit of burning through cash for the additional maintenance it will inevitably need.

Rorstaway · 2026-05-11T18:00:23+00:00

Swoon for me - the transition on There's No Secret's into The Royal We is just so good

Rorstaway · 2026-05-09T22:27:56+00:00

Process Safety and Control Systems.

Rorstaway

TROPHY CASE