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Search: Posts Made By: danw
Forum: LIVE PLC Questions And Answers Today, 01:49 PM
Replies: 13
Views: 247
Posted By danw
I have exactly the same mental picture. When I...

I have exactly the same mental picture. When I read what you wrote, I spilled my coffee I laughed so hard.

I'm a fan of Type T for low ranges like this because the inherent error is half that of...
Forum: LIVE PLC Questions And Answers Yesterday, 05:33 PM
Replies: 13
Views: 247
Posted By danw
The better vendors show the ranges starting at...

The better vendors show the ranges starting at 0C, with T and E types for sub-zero:

https://s9.postimg.org/ub9hidc4v/Tempco_statement_regarding_accuracy_tolerance_below_freezing-hi.jpg

And...
Forum: LIVE PLC Questions And Answers Yesterday, 03:00 PM
Replies: 13
Views: 247
Posted By danw
Read what Dataq has to say here: ...

Read what Dataq has to say here:

https://www.dataq.com/blog/data-logger/thermocouple-data-loggers/sub-zero-thermocouple-measurements/

In summary, only E or T are really useable - wire should be...
Forum: LIVE PLC Questions And Answers February 14th, 2018, 08:20 PM
Replies: 9
Views: 304
Posted By danw
The water/waste water (w/ww) industry generally...

The water/waste water (w/ww) industry generally accepts "Verification" of magmeters, which is a process that assesses whether the meter performs within a tolerance band of its factory-new...
Forum: LIVE PLC Questions And Answers February 9th, 2018, 07:02 PM
Replies: 13
Views: 398
Posted By danw
I've used the Lantronix Xpress DR-IAP with the...

I've used the Lantronix Xpress DR-IAP with the Modbus option.

The several that I have used have been in service for at least 5 years and continue to work OK.

Several comments on their use:
1. ...
Forum: LIVE PLC Questions And Answers February 5th, 2018, 08:04 PM
Replies: 17
Views: 403
Posted By danw
A. Measuring flow rate with DP has a couple...

A. Measuring flow rate with DP has a couple downsides:

1. low turn down (1:4) due to flow being a square root function. Flow rate readings are noisy and inaccurate at low flow, where low flow is...
Forum: LIVE PLC Questions And Answers February 4th, 2018, 09:48 PM
Replies: 17
Views: 403
Posted By danw
Piping natural gas through plastic tubing is not...

Piping natural gas through plastic tubing is not only against the advice of others, it is not allowedd by NFPA code. Beware the liability.

National Fuel Gas Code NFPA 54-2006 ANSI Z223.1-2006
...
Forum: LIVE PLC Questions And Answers January 29th, 2018, 09:38 AM
Replies: 9
Views: 271
Posted By danw
I agree with Dan Wiebe. It is not clear what the...

I agree with Dan Wiebe. It is not clear what the RTU's need to do.

RTU's typically have I/O, are low power, have some calculation and control functionality, and a choice of digital protocols on...
Forum: LIVE PLC Questions And Answers January 26th, 2018, 12:13 AM
Replies: 27
Views: 1,725
Posted By danw
This ain't nothin' compared to 10:00AM EST...

This ain't nothin' compared to 10:00AM EST Tuesday, October 23rd 1962 when the US naval blockade/quarantine of Cuba began. The clock then was about 3 seconds to midnight.

I sat in a school room...
Forum: LIVE PLC Questions And Answers January 25th, 2018, 01:16 PM
Replies: 12
Views: 289
Posted By danw
not flippant

not flippant
Forum: LIVE PLC Questions And Answers January 16th, 2018, 12:19 PM
Replies: 12
Views: 464
Posted By danw
If this oxygen sensor is a zirconium oxide sensor...

If this oxygen sensor is a zirconium oxide sensor that has to be hot or heated to produce an oxygen reading, then you should know that that type of sensor is a high impedance output, which can be...
Forum: LIVE PLC Questions And Answers January 12th, 2018, 07:32 PM
Replies: 11
Views: 674
Posted By danw
I haven't a clue for a solution, but I have to...

I haven't a clue for a solution, but I have to ask, Why?
Forum: LIVE PLC Questions And Answers January 12th, 2018, 07:30 PM
Replies: 5
Views: 173
Posted By danw
It's what Steve explains - if the input detects...

It's what Steve explains - if the input detects an open circuit, the implication is that the thermocouple has burned out so it is not capable of providing a valid temperature signal.

Almost all...
Forum: LIVE PLC Questions And Answers January 9th, 2018, 10:04 AM
Replies: 18
Views: 545
Posted By danw
The pressure transmitter that E&H supplies as a...

The pressure transmitter that E&H supplies as a part of that vortex meter is an absolute pressure transmitter.
Forum: LIVE PLC Questions And Answers December 29th, 2017, 01:00 PM
Replies: 43
Views: 1,810
Posted By danw
The pre-NT/2000/XP/7/10 O/S's, that is...

The pre-NT/2000/XP/7/10 O/S's, that is DOS/3/95/98, controlled the serial COM ports differently than the later MS O/S's. I'm straining to remember details and I'm coming up blank. NT might have...
Forum: LIVE PLC Questions And Answers December 29th, 2017, 11:05 AM
Replies: 8
Views: 465
Posted By danw
The pump needs power so there must be a power...

The pump needs power so there must be a power line running out there, right?

If the power line is 240Vac, then there are Power Line Communication (PLC) modems that handle RS-485 communications...
Forum: LIVE PLC Questions And Answers December 28th, 2017, 08:31 PM
Replies: 10
Views: 360
Posted By danw
1. In Modbus addressing, a leading digit...

1. In Modbus addressing, a leading digit representing the address memory table is widely used as a help in identifying the type of data:
discrete input uses a leading or inferred numeral (0) ...
Forum: LIVE PLC Questions And Answers December 25th, 2017, 10:26 AM
Replies: 7
Views: 540
Posted By danw
+1 Thanks for the link. Very informative. Dan

+1 Thanks for the link. Very informative. Dan
Forum: LIVE PLC Questions And Answers December 20th, 2017, 10:54 PM
Replies: 5
Views: 289
Posted By danw
Most PLC's that have a thermocouple I/O card have...

Most PLC's that have a thermocouple I/O card have a cold junction temperature sensor that is supposed to monitor the temperature of the connection terminals. Many times that value can be tagged for...
Forum: LIVE PLC Questions And Answers December 20th, 2017, 10:50 PM
Replies: 5
Views: 355
Posted By danw
+1 for rpoet. He took the words right out of my...

+1 for rpoet. He took the words right out of my mouth.
Forum: LIVE PLC Questions And Answers December 20th, 2017, 08:41 AM
Replies: 14
Views: 708
Posted By danw
It will measure the temperature at the location...

It will measure the temperature at the location of the thermowell, so the assumption is that the thermowell location is representative of the temperature of the entire bath.

A Type T thermocouple...
Forum: LIVE PLC Questions And Answers December 10th, 2017, 02:15 PM
Replies: 1
Views: 164
Posted By danw
Integrator for Banner DXM100 radio controller

I'm told Banner's wireless DXM100 controller is an engineer's dream and that it'll do anything, but it exceeds my ability to map a node AI to a gateway AO and get a 4-20mA out of the AO.

Anyone...
Forum: LIVE PLC Questions And Answers December 7th, 2017, 07:04 PM
Replies: 5
Views: 226
Posted By danw
I've seen dozens of RS-485 connections before: ...

I've seen dozens of RS-485 connections before:

Here's a handful of them:

https://s2.postimg.org/gk4t0r0i1/RS_485_terminal_connections_and_labeling.jpg

None have a termination terminal.

I...
Forum: LIVE PLC Questions And Answers December 7th, 2017, 05:36 PM
Replies: 5
Views: 226
Posted By danw
Is it likely that Modbus RTU over RS-485 is the...

Is it likely that Modbus RTU over RS-485 is the only signal on the RJ-45? Probably. If that's the case, then it is a known fact that swapping the driver lines will not damage the driver lines. ...
Forum: LIVE PLC Questions And Answers December 6th, 2017, 02:32 AM
Replies: 5
Views: 269
Posted By danw
1. Does the Parity setting on RS-485 side of...

1. Does the Parity setting on RS-485 side of Gateway match the PLC and drive parity settings?

2. Have you tried swapping the RS-485 A/B or (+)/(-) lines at the 485 side of hhe Gateway?

3. Is...
Showing results 1 to 25 of 500

 
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