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Search: Posts Made By: danw
Forum: LIVE PLC Questions And Answers January 17th, 2019, 10:09 AM
Replies: 12
Views: 639
Posted By danw
You are correct, the load determines the current...

You are correct, the load determines the current draw.

If you are using a PLC relay output for control, then the relay needs to switch a voltage, either 100-230Vac or 24Vdc (polarity is important...
Forum: LIVE PLC Questions And Answers January 13th, 2019, 06:50 PM
Replies: 12
Views: 665
Posted By danw
A 4 wire RTD has two 'common' wires of one color...

A 4 wire RTD has two 'common' wires of one color on one side of the resistor element and two common wires of a different color on the other side of the resistor. The resistor element changes...
Forum: LIVE PLC Questions And Answers January 10th, 2019, 08:00 PM
Replies: 4
Views: 261
Posted By danw
Wika has a 0-50 inwc range for its S-1...

Wika has a 0-50 inwc range for its S-1 cylindrical 2 wire gauge pressure transmitter (8367656) with a 1/2" NPT male process connection.

I assume the tank is an open tank, not under any...
Forum: LIVE PLC Questions And Answers January 10th, 2019, 01:15 PM
Replies: 4
Views: 261
Posted By danw
Submersible head pressure transmitter, if the...

Submersible head pressure transmitter, if the temperature is within range because it goes in from the top. They come with an atmospheric vent tube that should be terminated in a dessicant to keep...
Forum: LIVE PLC Questions And Answers January 10th, 2019, 01:07 PM
Replies: 2
Views: 138
Posted By danw
The Micro-DCI communications is "RS-485", meaning...

The Micro-DCI communications is "RS-485", meaning their proprietary protocol ("secure DataLink protocol") not Modbus or Ethernet/IP or Profibus. That is not modern in my book. That's back to 1990. ...
Forum: LIVE PLC Questions And Answers January 9th, 2019, 03:56 PM
Replies: 20
Views: 1,062
Posted By danw
For what it's worth, My brother-in-law does home...

For what it's worth, My brother-in-law does home inspections for prospective house buyers. He'd red flag a custom control system as a 'custom control system', not likely to be maintained or repaired...
Forum: LIVE PLC Questions And Answers January 5th, 2019, 11:11 AM
Replies: 11
Views: 563
Posted By danw
Mactek had a utility program, the Viator Check...

Mactek had a utility program, the Viator Check Utility, that would poll the device for its primary variable once per second. When that worked, you knew that HART communications could be...
Forum: LIVE PLC Questions And Answers January 5th, 2019, 11:06 AM
Replies: 10
Views: 297
Posted By danw
what does the protocol 132 error mean? ...

what does the protocol 132 error mean?


Have you tried setting the master poll rate at something slow, like once every 15 seconds, to see if the slave can respond for every poll?
Forum: LIVE PLC Questions And Answers January 4th, 2019, 10:38 AM
Replies: 11
Views: 563
Posted By danw
My opinion: Pactware is sufficiently...

My opinion: Pactware is sufficiently non-intuitive to warrant experimenting with it before you show up on-site. I'd suggest connecting to any HART device to get an idea of how the software works.
Forum: LIVE PLC Questions And Answers January 3rd, 2019, 09:49 AM
Replies: 7
Views: 318
Posted By danw
Too many TLA's. What's PIT? What's FIT?

Too many TLA's. What's PIT? What's FIT?
Forum: LIVE PLC Questions And Answers January 1st, 2019, 05:03 PM
Replies: 4
Views: 218
Posted By danw
The manual is here: ...

The manual is here:
https://www.emerson.com/documents/automation/manual-fisher-fieldvue-dvc6200-hw1-digital-valve-controller-en-125460.pdf

The first page says, "The product covered in this...
Forum: LIVE PLC Questions And Answers January 1st, 2019, 09:23 AM
Replies: 12
Views: 662
Posted By danw
"Voltage is voltage" as long as the reference...

"Voltage is voltage" as long as the reference (usually ground, but not always) is the same. Ground references at different potentials is called common mode.

If the grounds are at different...
Forum: LIVE PLC Questions And Answers December 31st, 2018, 12:34 PM
Replies: 11
Views: 563
Posted By danw
1. Sometimes you do have to add the 250 ohm...

1. Sometimes you do have to add the 250 ohm resistor to existing loops.

Lots of existing loops already have 250 ohms or input resistance on the analog input. But that's by no means a given. ...
Forum: LIVE PLC Questions And Answers December 29th, 2018, 06:44 PM
Replies: 2
Views: 222
Posted By danw
That's it. The Change Settings allowed me to...

That's it. The Change Settings allowed me to enable the 2nd instance and after the change, Peak connects OK.



Thank you.

Dan
Forum: LIVE PLC Questions And Answers December 29th, 2018, 05:55 PM
Replies: 2
Views: 222
Posted By danw
Peak Modbus TCP slave/server simulator not communicating

Installed Peak V3.0 Modbus/TCP slave/server simulator on Windows 10 box.

Configured a couple registers and attempted to read from it with a box that moments before was used as a slave to Modbus...
Forum: LIVE PLC Questions And Answers December 17th, 2018, 01:17 PM
Replies: 17
Views: 972
Posted By danw
1. Assumptions kill you. Not literally, but...

1. Assumptions kill you.

Not literally, but when you assume that X is functional, it might well not really be the case.

2. Write stuff down.

I can't believe how many times I've been stuck...
Forum: LIVE PLC Questions And Answers December 7th, 2018, 04:23 PM
Replies: 4
Views: 410
Posted By danw
RS-485 is differential driver A minus driver B...

RS-485 is differential driver A minus driver B (or vice versa, I can't recall which off the top of my head), but the circuitry is not differential.

The circuit is driver-line-A-to-IC-ground-pin...
Forum: LIVE PLC Questions And Answers December 7th, 2018, 12:16 PM
Replies: 6
Views: 553
Posted By danw
I hate symbols

Rant On

Another thread had an interesting observation:

One square inside another is the standard symbol of double isolation

I had no idea. Thanks to the observation, now I know.

I...
Forum: LIVE PLC Questions And Answers December 6th, 2018, 10:29 AM
Replies: 12
Views: 665
Posted By danw
There are lots of theoretical and practical...

There are lots of theoretical and practical reasons why a voltage input does not measure temperature with an RTD

page 13 (pdf) of this document...
Forum: LIVE PLC Questions And Answers December 5th, 2018, 09:50 AM
Replies: 12
Views: 796
Posted By danw
Very interesting thread on Beckhoff and Ethercat....

Very interesting thread on Beckhoff and Ethercat. Thanks for posting.
Forum: LIVE PLC Questions And Answers December 3rd, 2018, 01:25 PM
Replies: 12
Views: 796
Posted By danw
I was involved with DAQ at those speeds 30 years...

I was involved with DAQ at those speeds 30 years ago. The technology hardware and software has undoubtedly gotten better over the years, but my gut feeling is that you'd be better to stick with...
Forum: LIVE PLC Questions And Answers December 3rd, 2018, 08:49 AM
Replies: 2
Views: 138
Posted By danw
The RS-485 port runs - a proprietary LCN...

The RS-485 port runs

- a proprietary LCN protocol to drive now-obsolete L&N/Honeywell HMI's; the protocol is not documented and of no practical use otherwise.

- Modbus RTU. There are two...
Forum: LIVE PLC Questions And Answers December 2nd, 2018, 03:55 PM
Replies: 16
Views: 528
Posted By danw
Good illustration. That helps enormously. ...

Good illustration. That helps enormously.



But someone else will have to help you on this, I don't do internet commmunications that involve gateways and routers, but I suspect that it...
Forum: LIVE PLC Questions And Answers December 2nd, 2018, 09:36 AM
Replies: 16
Views: 528
Posted By danw
David was trying to establish exactly what you...

David was trying to establish exactly what you are trying to accomplish because that was not clear from your first post, and to me, that still is not clear. The manuals can provide details for...
Forum: LIVE PLC Questions And Answers November 29th, 2018, 10:54 AM
Replies: 12
Views: 481
Posted By danw
Asking for a review of specific product in a...

Asking for a review of specific product in a thread with a different has a high probability of not reaching those who might respond.


You should probably start a new thread asking for your review.
Showing results 1 to 25 of 500

 
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