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Search: Posts Made By: Tom Jenkins
Forum: LIVE PLC Questions And Answers June 20th, 2018, 11:51 AM
Replies: 9
Views: 423
Posted By Tom Jenkins
+1

+1
Forum: LIVE PLC Questions And Answers June 7th, 2018, 11:33 AM
Replies: 5
Views: 139
Posted By Tom Jenkins
The Horner is quite flexible, and if you get the...

The Horner is quite flexible, and if you get the right I/O you can do what you want. Control over a comm link is also a possibility. Horner has pretty good tech support, so you can always contact...
Forum: LIVE PLC Questions And Answers June 6th, 2018, 10:41 AM
Replies: 5
Views: 262
Posted By Tom Jenkins
+1 You will never find a first job that you...

+1

You will never find a first job that you are totally prepared to perform. That includes "Do you want fries with that?" level. It is impossible to not have mistakes. What is important is...
Forum: LIVE PLC Questions And Answers June 4th, 2018, 11:02 AM
Replies: 35
Views: 1,814
Posted By Tom Jenkins
Another vote for AutomationDirect. However,...

Another vote for AutomationDirect.

However, in my experience, the cost of the PLC hardware is a fraction of the total project cost. I used AutomationDirect because I liked the hardware,...
Forum: LIVE PLC Questions And Answers May 30th, 2018, 01:03 PM
Replies: 13
Views: 395
Posted By Tom Jenkins
I always recommend disconnect terminal blocks for...

I always recommend disconnect terminal blocks for 4-20mA analog signals. You can put your leads on either side of the terminal block, pop open the switch, take your reading, and close the switch -...
Forum: LIVE PLC Questions And Answers May 30th, 2018, 10:25 AM
Replies: 13
Views: 395
Posted By Tom Jenkins
+1 Note that on a two-wire loop the entire...

+1

Note that on a two-wire loop the entire current capacity of the power supply will go through the Fluke and blow its fuse. On a three-wire transmitter, the power supply is on the third wire, and...
Forum: LIVE PLC Questions And Answers May 29th, 2018, 09:44 AM
Replies: 16
Views: 670
Posted By Tom Jenkins
There's no need to guess about the right cooling...

There's no need to guess about the right cooling method. Rittal, Hoffman, etc. have methods in their catalogs for calculating the heat load and cooling capacities of a system. You can also get tech...
Forum: LIVE PLC Questions And Answers May 25th, 2018, 12:39 PM
Replies: 8
Views: 327
Posted By Tom Jenkins
I've used Omega humidity/temp sensors with...

I've used Omega humidity/temp sensors with success, but not that particular model.
Forum: LIVE PLC Questions And Answers May 21st, 2018, 08:04 AM
Replies: 21
Views: 529
Posted By Tom Jenkins
The concern over accuracy is legitimate but often...

The concern over accuracy is legitimate but often exaggerated.

Th basic method of multiplying flow rate at a sample point by the time interval is sound - it is essentially a simplification of the...
Forum: LIVE PLC Questions And Answers May 20th, 2018, 08:21 AM
Replies: 7
Views: 369
Posted By Tom Jenkins
I've used Phoenix digital for Modbus to...

I've used Phoenix digital for Modbus to A-B/Rockwell. Great support and easy setup.

http://www.phoenixdigitalcorp.com/products.html
Forum: LIVE PLC Questions And Answers May 13th, 2018, 11:42 AM
Replies: 5
Views: 592
Posted By Tom Jenkins
https://www.engineeringtoolbox.com/ Not a...

https://www.engineeringtoolbox.com/

Not a forum, but a great source of info.
Forum: LIVE PLC Questions And Answers May 7th, 2018, 06:09 PM
Replies: 17
Views: 901
Posted By Tom Jenkins
F = p x A So, all other things being equal,...

F = p x A

So, all other things being equal, yes, a larger pocket will produce more force. In this equation p = the pressure difference between the atmosphere and the pocket and A is the area of...
Forum: LIVE PLC Questions And Answers May 7th, 2018, 06:06 PM
Replies: 13
Views: 1,417
Posted By Tom Jenkins
In my opinion fuzzy logic is certainly...

In my opinion fuzzy logic is certainly over-hyped. I have always felt that it was a bit like putting lipstick on a pig.
Forum: LIVE PLC Questions And Answers May 3rd, 2018, 04:05 PM
Replies: 16
Views: 1,185
Posted By Tom Jenkins
1) It looks to me like you will have a tough time...

1) It looks to me like you will have a tough time getting 10" linear motion out of the linkage. There is some additional info needed. How is the horizontal section constrained? What limits the...
Forum: LIVE PLC Questions And Answers April 30th, 2018, 10:25 AM
Replies: 5
Views: 294
Posted By Tom Jenkins
Robicon used to use signal conditioners to...

Robicon used to use signal conditioners to convert the 4-20 mA into (I think?) 0-5 VDC to go into the analog input card. Back in the day I had lots of trouble with those being off calibration, as...
Forum: LIVE PLC Questions And Answers April 26th, 2018, 02:10 PM
Replies: 13
Views: 516
Posted By Tom Jenkins
You are missing an important part of the...

You are missing an important part of the calculation - the coefficient of convection - the factor that idntifies the rate of heat transfer from product to air.If varies with the air temperature, air...
Forum: LIVE PLC Questions And Answers April 25th, 2018, 09:14 AM
Replies: 7
Views: 383
Posted By Tom Jenkins
This kind of question seems to come up often. ...

This kind of question seems to come up often.

This is really a First Law of Thermodynamics question. The energy and power has to be the same all the way through a system. (Less friction losses, of...
Forum: LIVE PLC Questions And Answers April 21st, 2018, 08:22 AM
Replies: 2
Views: 367
Posted By Tom Jenkins
Sometimes if you hang a capacitor across the...

Sometimes if you hang a capacitor across the input terminals it will attenuate the noise. Try a 220 micro-Farad and see if it works.
Forum: LIVE PLC Questions And Answers April 21st, 2018, 08:18 AM
Replies: 9
Views: 532
Posted By Tom Jenkins
With a gauge isolator you can use a standard...

With a gauge isolator you can use a standard transmitter. There are various styles and fill fluids. For your application you might consider the ring style, which reduces the problem of fouling the...
Forum: LIVE PLC Questions And Answers April 20th, 2018, 09:16 AM
Replies: 9
Views: 532
Posted By Tom Jenkins
Most any good transmitter will do. I've had good...

Most any good transmitter will do. I've had good luck with E + H, Foxboro, Keller, and others over the years.

Something to consider is a gauge isolator, so your transmitter isn't directly inserted...
Forum: LIVE PLC Questions And Answers April 16th, 2018, 09:45 AM
Replies: 11
Views: 770
Posted By Tom Jenkins
IF you are going to filter I'd start with a...

IF you are going to filter I'd start with a strainer with a magnetic plug of the sort provided in hydraulic systems, then a coarse filter downstream.
Forum: LIVE PLC Questions And Answers April 15th, 2018, 08:33 AM
Replies: 41
Views: 2,425
Posted By Tom Jenkins
http://www.mouser.com/pdfdocs/alphawire-Understand...

http://www.mouser.com/pdfdocs/alphawire-Understanding-Shielded-Cable.pdf
Forum: LIVE PLC Questions And Answers April 14th, 2018, 07:50 AM
Replies: 11
Views: 770
Posted By Tom Jenkins
Eccentric plug valves are a good choice for...

Eccentric plug valves are a good choice for fluids with a lot of suspended solids:

http://www.dezurik.com/products/product-line/plug-valves/eccentric-plug-valves-pec-pef/1/115/

A variety of...
Forum: LIVE PLC Questions And Answers April 12th, 2018, 02:33 PM
Replies: 4
Views: 287
Posted By Tom Jenkins
Cascade control isn't magic. It's just that...

Cascade control isn't magic. It's just that instead of using the manipulated variable of the master loop to control a real-world final control element you use it as the setpoint of the slave loop. In...
Forum: LIVE PLC Questions And Answers March 31st, 2018, 02:01 PM
Replies: 6
Views: 452
Posted By Tom Jenkins
To use feedforward you need to have a process...

To use feedforward you need to have a process model. Many folks don't understand the process and equipment well enough to do that.
Showing results 1 to 25 of 500

 
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