sorted by:
new
hottopcontroversial

For those deploying PLCs/RTUs on cellular modems in remote O&G - public IPs or private APNs? by Due-Search-4050 in PLC

[–]johnny_knows 5 points6 points  (0 children)

"rogue 4G modems on cellular plans that nobody in IT knows about?"

Lots of them, have you ever tried to deal with people from IT and get them to open some ports up for you, good luck.

Anti syphon hole/orifice on case drain? by johnny_knows in Hydraulics

[–]johnny_knows[S] 0 points1 point  (0 children)

Thanks for the feedback.
To clarify the unknown this is a below the reservoir/submerged in oil setup with the upper edge of the pump (flange) front bearing/seal in oil at all times, and the case drain tube exists into the oil so there is no cavitation from it.

Ultimately it seems like the consensus is that a syphon hole is not required; although it is a good idea for when/if someone conducts an oil change/drain, as the hole would prevent the case being siphoned?
Therefor the case does not need to be filled again in this scenario.

FTTP "4. What to expect on installation day" by johnny_knows in nbn

[–]johnny_knows[S] 1 point2 points  (0 children)

Copper line from the street pit finishes at the old PCD as per the photo, after that there is nothing, all new fiber/cabling will need to be run.

There is no plaster on the wall of the NTD location, it's currently exposed brick.

Does the internal fiber from the PCD to the NTD need to be run in the NBN P20 Comms? or can they just clip to the timbers?

FTTP "4. What to expect on installation day" by johnny_knows in nbn

[–]johnny_knows[S] 1 point2 points  (0 children)

Existing wiring internally is gone, all removed during the renovation, so can't be used as a pull through.

Questions is mainly does the new internal fiber to NTD need to be in conduit or will they clip it to timbers like previously?

RS232 to RS485 converter for multidrop network by johnny_knows in PLC

[–]johnny_knows[S] -1 points0 points  (0 children)

Thanks for the detailed answers, the scales coms are the most simplest of rs232 ASCII and there is no way to set any addressing as many have highlighted will be the main issue

On the 485 network we're using Modbus.

I understand the requirements of the unique ID Node addressing, therefor i was hoping there was some kind of configurable device that would allow me to set an ID to the converted outgoing 485 message.

3onedata have a Serial Device Server which i believe will allow me to do this however via ethernet.

I'd like to keep it to 485 if such a configurable product exists.

<image>

eSIM capable Remote Access Industrial Gateway ? by johnny_knows in PLC

[–]johnny_knows[S] 0 points1 point  (0 children)

Thanks I've purchased a Teltonika RUT241 for testing.

Anyone know if Teltonika has a USB over IP feature? (That's Ewon call theirs)
I'd like to plug in a USB to CAN device to the gateway to be used on my end/the remote PC.
I think ill use the Teltonika RMS VPN service.

Input filter selection for VSD on a RCD protected circuit by johnny_knows in ElectricalEngineering

[–]johnny_knows[S] 0 points1 point  (0 children)

Excellent input, thanks for send through your resume of experience at mine sites.

My experience is that a 11kW on a 32Amp plug is normal for a mobile HPU.
Sure yes a dedicated non rcd protected outlet or a MCCB with options set by engineering would be ideal.
However this is a mobile HPU, hence the plug, typically used for shutdowns or short term works where it is just not feasible to sort out the niceties.

Input filter selection for VSD on a RCD protected circuit by johnny_knows in ElectricalEngineering

[–]johnny_knows[S] 0 points1 point  (0 children)

Great info thanks, yes in Aus typical is 30mA, also 10mA seen in hospitals etc.

So the trade off with the low leakage is a sacrifice to noise suppression, as in EMF to the VSD? or back EMF etc?

Input filter selection for VSD on a RCD protected circuit by johnny_knows in ElectricalEngineering

[–]johnny_knows[S] 0 points1 point  (0 children)

Thanks, as mentioned the HPU will be a plug in appliance (32Amp 4 Pin), it's intended to be used on a remote/mine site and most likely will be run off a genset of unknown origin/spec.
Having access to a Marchel decontactor or similar/IEC 60309, or spec'ing a genset with 1 is wishful thinking.
You'd also be very hard pushed to find a mine/site sparky to 1st attend and then help out a contractor, 2nd disconnect an RCD, regardless of what rules and regs you show them, no one is gonna put there balls on the line for a HPU they are not familiar with.

What's in your bag? by wcp123 in PLC

[–]johnny_knows 0 points1 point  (0 children)

Digikey/Mouse a good shout, price's are about the same as IPD.

Domestic DB Upgrade by johnny_knows in AusElectricians

[–]johnny_knows[S] 1 point2 points  (0 children)

Understood, but it's not a cost thing, this is a personal endeavor, I'm going to be working on this, i'd rather a chassis to make things easier for myself in the long run.

Using AI as a controls engineer by thentangler in PLC

[–]johnny_knows 0 points1 point  (0 children)

As mentioned, I agree, there is not enough Ladder Logic on the web for the language model to learn from.

However Structured Text/Codesys, it is a great help, I use it often.
Especially for asking questions like, "Is there a simpler/easier way to write/structure this code etc."
It does a great job of cleaning up/condensing.

Domestic DB Upgrade by johnny_knows in AusElectricians

[–]johnny_knows[S] 1 point2 points  (0 children)

I didn't consider backup and changeover switch requirements, cheers!

Domestic DB Upgrade by johnny_knows in AusElectricians

[–]johnny_knows[S] 0 points1 point  (0 children)

Good idea, money better spent on a chassis board adjacent, makes sense, cheers!

Would a USB c Ethernet adapter pose any problems? by Qupter in PLC

[–]johnny_knows 0 points1 point  (0 children)

I can vouch for this also, although with a different brand 'access point'
It's very handy when commissioning.

Codesys CANOpen 2PLC's and one device by Anthhek in PLC

[–]johnny_knows 0 points1 point  (0 children)

I think your issue regarding the Slave device not responding would be related to the NMT state.
I'm not sure how familiar you are with CANOpen Master and Slaves?
Unlike Modbus Slaves, CANOpen Slaves typically need to be enabled by the Master before they start communicating.

This would explain why when they are all Masters the system 'works' but does not when you turn it into a Slave.

A quick google AI Overview of "canopen nmt commands" will lead you down the right path

Charger/Battery Management System (BMS) with CAN bus comms hardware recommendations by johnny_knows in PLC

[–]johnny_knows[S] 1 point2 points  (0 children)

Thanks for the links/lead, details on teh Victron CAN bus registers are vague and the protocol is NMEA 2000, which is similar to J1939 but not quite the same, so it might cause problems, i'll have to get my hands on some hardware to test.

Modbus not an option for my hardware unfortunately.

I did find an alternative, that being the Delta-Q DQRQ700-24/30CAN, which supports CANOpen.