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Search: Posts Made By: danw
Forum: LIVE PLC Questions And Answers Yesterday, 03:24 PM
Replies: 4
Views: 157
Posted By danw
I've never seen the extruder that makes Cheerios,...

I've never seen the extruder that makes Cheerios, but the plant engineer described it at an ISA meeting 4-5 years ago. It did not sound like your installation, but the nickel wire extruder down the...
Forum: LIVE PLC Questions And Answers June 29th, 2020, 05:56 PM
Replies: 14
Views: 595
Posted By danw
Thanks for follow-up.

Thanks for follow-up.
Forum: LIVE PLC Questions And Answers June 28th, 2020, 05:20 PM
Replies: 4
Views: 309
Posted By danw
I believe your functional description is correct....

I believe your functional description is correct.

I suspect that the pressures stated on the actuator spec/label are for bench operation, the pressures needed to create the force needed to...
Forum: LIVE PLC Questions And Answers June 26th, 2020, 02:33 PM
Replies: 2
Views: 208
Posted By danw
check your private message

check your private message
Forum: LIVE PLC Questions And Answers June 26th, 2020, 02:26 PM
Replies: 2
Views: 208
Posted By danw
DE should be more robust than most other comm...

DE should be more robust than most other comm protocols because of its physical implementation - it modulates the 4-20mA signal between 4mA and 20mA for bit state changes. Given a current loop's...
Forum: LIVE PLC Questions And Answers June 18th, 2020, 10:51 PM
Replies: 8
Views: 401
Posted By danw
It's too easy to blame the messenger. ...

It's too easy to blame the messenger.


There is a very low probability of 2 modern pressure transmitters failing or going out of calibration at the same time.



That's assuming no one has...
Forum: LIVE PLC Questions And Answers June 10th, 2020, 07:34 PM
Replies: 26
Views: 937
Posted By danw
disabled Cold Junction

If you trust the IR gun and your F units are correct for the T/C conversion, then the difference between the IR gun at 170 and the 110 is 60 Deg F low on the HMI, which could be...
Forum: LIVE PLC Questions And Answers May 31st, 2020, 06:33 PM
Replies: 6
Views: 594
Posted By danw
Grasping at straws . . . me, too. Unless you...

Grasping at straws . . . me, too.

Unless you have the DVM set on an Amps scale so high that the resolution is only whole milliamps, like 0.006A instead of something like 6.27mA, 6,38ma, 6.09mA, I...
Forum: LIVE PLC Questions And Answers May 30th, 2020, 10:23 PM
Replies: 4
Views: 737
Posted By danw
Nice job on the video. You ran into two...

Nice job on the video.


You ran into two out of the four big Modbus RTU Gotchas, the dreaded one offset (zero based register addressing vs one based register addressing) and hex vs decimal for...
Forum: LIVE PLC Questions And Answers May 6th, 2020, 12:20 PM
Replies: 16
Views: 1,383
Posted By danw
It appears that they need a resistance test for...

It appears that they need a resistance test for coils. The Laurels module will make that measurement by sourcing a current (through the coil, reading the voltage drop and reporting the result as a...
Forum: LIVE PLC Questions And Answers May 6th, 2020, 08:19 AM
Replies: 16
Views: 1,097
Posted By danw
Correct. There is no commercial market to...

Correct. There is no commercial market to convert any kind of input to a low level, mV, non-linear thermocouple characterized signal. The market is for converters that convert some thing to a...
Forum: LIVE PLC Questions And Answers May 1st, 2020, 08:37 AM
Replies: 8
Views: 604
Posted By danw
When a thermocouple fails and breaks and becomes...

When a thermocouple fails and breaks and becomes an open circuit, then that condition has historically been fairly easy to detect and indicate by driving the indicated reading/temperatuer upscale or...
Forum: LIVE PLC Questions And Answers April 30th, 2020, 08:03 AM
Replies: 8
Views: 604
Posted By danw
The resistance of thermocouple wire is...

The resistance of thermocouple wire is signficantly higher than the resistance of copper wire (except for Type T which is copper alloys).

The resistance of a 'good' T/C junction does not change...
Forum: LIVE PLC Questions And Answers April 30th, 2020, 12:12 AM
Replies: 6
Views: 415
Posted By danw
On an RS-485 network the master can be at either...

On an RS-485 network the master can be at either end or at any node along the way. But only the end points get termination resistors, whether they're slaves or a master.

The Tx(+) and Rx(+)...
Forum: LIVE PLC Questions And Answers April 24th, 2020, 01:14 PM
Replies: 34
Views: 2,523
Posted By danw
I guess I've missed those threads, because I...

I guess I've missed those threads, because I didn't notice the unfriendly posts.

My observation is that unless the OP is a regular here already, getting the needed information is highly...
Forum: LIVE PLC Questions And Answers April 24th, 2020, 12:11 PM
Replies: 4
Views: 420
Posted By danw
353 is obsolete. It'll be Ebay time if you go...

353 is obsolete. It'll be Ebay time if you go that route.

Honeywell app note on using a UDC 2500 as an auto-manual station is attached. It does what you describe: manual control from the UDC,...
Forum: LIVE PLC Questions And Answers April 23rd, 2020, 11:26 AM
Replies: 16
Views: 843
Posted By danw
Gary, You're right, any 0-5A AC CT can be...

Gary,

You're right, any 0-5A AC CT can be used on the secondary. I was thinking of a NK equivalent. Dan
Forum: LIVE PLC Questions And Answers April 22nd, 2020, 06:34 PM
Replies: 16
Views: 843
Posted By danw
I don't think so. There is an existing CT with a...

I don't think so. There is an existing CT with a 0-5Amp AC secondary and the question is how to convert that 0-1Amp AC to a 4-20mA signal.

The NK Technologies device in post #2 does do the AC...
Forum: LIVE PLC Questions And Answers April 22nd, 2020, 12:47 PM
Replies: 16
Views: 843
Posted By danw
There's always warning the secondary on a CT has...

There's always warning the secondary on a CT has to remain closed or there is a possibility of life endangering voltage.


I don't know whether a diode blocking the half wave constitutes a valid...
Forum: LIVE PLC Questions And Answers April 22nd, 2020, 09:00 AM
Replies: 13
Views: 826
Posted By danw
U tube water manometer made from a length of...

U tube water manometer made from a length of transparent plastic tubing



https://i.postimg.cc/L8tdV0YB/unnamed.jpg

and a wi-fi web cam
Forum: LIVE PLC Questions And Answers April 21st, 2020, 08:52 AM
Replies: 31
Views: 1,645
Posted By danw
If you put a floating, 9V battery across a 0-10V...

If you put a floating, 9V battery across a 0-10V AI card's (+) and (-) and only get 7V, you have a bad AI card.
Forum: LIVE PLC Questions And Answers April 20th, 2020, 11:02 PM
Replies: 31
Views: 1,645
Posted By danw
Your attached DVM photo (post #1) shows a value...

Your attached DVM photo (post #1) shows a value of 7.2V. But that's more than an expected 6.0 volts from a the 1:2 voltage divider across a 12.0V battery.

But if the battery was in a charging...
Forum: LIVE PLC Questions And Answers April 20th, 2020, 06:07 PM
Replies: 31
Views: 1,645
Posted By danw
Can you confirm that you are measuring the...

Can you confirm that you are measuring the voltage across the "bottom resistor"; across the Ch 1 (-) & Ch 1 (+)
as shown in the sketch below?
...
Forum: LIVE PLC Questions And Answers April 16th, 2020, 04:26 PM
Replies: 7
Views: 653
Posted By danw
An instrumentation grade Low Voltage Potential...

An instrumentation grade Low Voltage Potential Transformer takes you from 4800Vac to 120Vac, like the model PT3 here
https://www.flex-core.com/products/potential-transformers/

then whosever AC to...
Forum: LIVE PLC Questions And Answers April 14th, 2020, 03:17 PM
Replies: 23
Views: 1,177
Posted By danw
T201DC is a DC loop powered 4-20 mA current...

T201DC is a DC loop powered 4-20 mA current transducer.

Use a precision 250 ohm resistor across the voltage analog input to develop a 1-5Vdc signal. Scale the input for an offset of 20% above...
Showing results 1 to 25 of 500

 
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