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Search: Posts Made By: danw
Forum: LIVE PLC Questions And Answers November 13th, 2018, 10:27 AM
Replies: 4
Views: 199
Posted By danw
I'll take a pass on details of dumb positioners. ...

I'll take a pass on details of dumb positioners. Although I've sat through three or four power point presentations from different vendors of how a positioner works over the past 25 years, I can't...
Forum: LIVE PLC Questions And Answers November 13th, 2018, 12:27 AM
Replies: 4
Views: 199
Posted By danw
Diagram shows a basic I/P transducer. The...

Diagram shows a basic I/P transducer.
The squares on either side of the flapper (circle on the left, X on the right) are a cross sectional view of the electrical coil surrounding the flapper.

...
Forum: LIVE PLC Questions And Answers November 12th, 2018, 07:28 PM
Replies: 5
Views: 238
Posted By danw
The valve's positioner should essentially be...

The valve's positioner should essentially be "transparent". The controller's PID output is telling the valve where it should be to achieve a pressure setpoint. More open or less open (more closed)...
Forum: LIVE PLC Questions And Answers November 12th, 2018, 01:58 PM
Replies: 15
Views: 706
Posted By danw
You want to use one resistor, close to the ideal...

You want to use one resistor, close to the ideal value and a pot (potentiometer) to make the adjustment for the other resistor in series. Then you don't need to wait for precision resistors.
Forum: LIVE PLC Questions And Answers November 12th, 2018, 01:52 PM
Replies: 5
Views: 238
Posted By danw
Are you talking about the internal PID in a...

Are you talking about the internal PID in a 'smart' valve positioner that calculates the output response of the valve positioner, or are you talking about the PID control in a controller (using some...
Forum: LIVE PLC Questions And Answers November 9th, 2018, 11:50 AM
Replies: 4
Views: 146
Posted By danw
There are four assigned Modbus memory areas, as...

There are four assigned Modbus memory areas, as shown below:

(0)xxxxx, (coil registers)
(1)xxxxx, (Discrete Inputs status registers)
(3)xxxxx, (Input Registers)
(4)xxxxx, (Holding Registers)
...
Forum: LIVE PLC Questions And Answers November 9th, 2018, 09:35 AM
Replies: 4
Views: 146
Posted By danw
Function Code 03H reads from memory area...

Function Code 03H reads from memory area (4)xxxxx, known as Holding Registers, which are decimal numbers. The leading numeral (4) is not used in the Modbus message, it's only there so human beings...
Forum: LIVE PLC Questions And Answers November 8th, 2018, 01:39 PM
Replies: 15
Views: 706
Posted By danw
Someone asked for dual output thermocouple...

Someone asked for dual output thermocouple temperature transmitter on another forum and my response was that it's a big world out there and it might available, but I hadn't seen one yet.

Someone...
Forum: LIVE PLC Questions And Answers November 8th, 2018, 09:42 AM
Replies: 13
Views: 530
Posted By danw
The Siemens CLS100/200 capacitive point level...

The Siemens CLS100/200 capacitive point level sensors claim some discriminating sensing technology that can handle difficult level sensing apps.

I've used them for solids sensing - corn level...
Forum: LIVE PLC Questions And Answers October 22nd, 2018, 10:21 AM
Replies: 9
Views: 313
Posted By danw
0-20mA only applies to a 4 wire device, like an...

0-20mA only applies to a 4 wire device, like an analog output on a PLC, where the power to run the output electronics is supplied by the PLC.


4-20ma devices use the 3.6mA of the loop current...
Forum: LIVE PLC Questions And Answers October 17th, 2018, 07:18 PM
Replies: 13
Views: 4,723
Posted By danw
Hart is a master/slave protocol. My...

Hart is a master/slave protocol. My understanding is that the Moore Industries HIM acts as a HART master to poll the HART slave positioner to get the HART position data, which it then converts to an...
Forum: LIVE PLC Questions And Answers October 10th, 2018, 07:29 PM
Replies: 11
Views: 359
Posted By danw
Thanks for all the advice. Since it's one...

Thanks for all the advice.

Since it's one hole and I don't know when I'd do another, the knock-out punches lost out to a carbide tipped hole saw. The Ideal TKO brand has a number of good...
Forum: LIVE PLC Questions And Answers October 10th, 2018, 07:23 PM
Replies: 10
Views: 536
Posted By danw
RJ-45 connectors (standard for CAT cable) are...

RJ-45 connectors (standard for CAT cable) are used for all sorts of serial communications that is/are not Ethernet.

One has to be careful about what hardware is behind the RJ-45 connector. Back...
Forum: LIVE PLC Questions And Answers October 10th, 2018, 07:20 PM
Replies: 14
Views: 392
Posted By danw
I recommend an RS-485 isolator/repeater at the...

I recommend an RS-485 isolator/repeater at the master and half-way down a multidrop bus in order to

- protect the master in case of a fault hitting the 485 line

- protect half the multidrops...
Forum: LIVE PLC Questions And Answers October 10th, 2018, 11:35 AM
Replies: 11
Views: 359
Posted By danw
drill a 7/8" hole in SS for a 1/2" NPTM nipple

I need to drill a single hole (to pass a 1/2" NPTM pipe nipple) in a stainless panel/enclosure (already installed in the field, not in a shop).

Suggestions for a drill technique/tool?

I...
Forum: LIVE PLC Questions And Answers October 10th, 2018, 11:25 AM
Replies: 14
Views: 392
Posted By danw
Your inability to communicate with any drive...

Your inability to communicate with any drive suggests that when the VFD blew the doors off it might well have damaged the other devices on the communications bus (RS-485?).

I'd suggest that you...
Forum: LIVE PLC Questions And Answers September 26th, 2018, 08:00 AM
Replies: 12
Views: 844
Posted By danw
An Instrumentation Book Tony Kuphaldt's...

An Instrumentation Book

Tony Kuphaldt's Lessons in Instrumentation is a bargain - V2.3 is 3300 pages of text book level instruction in electricity, electronics as a background for process and...
Forum: LIVE PLC Questions And Answers September 15th, 2018, 12:52 AM
Replies: 5
Views: 489
Posted By danw
Does Beta tester ring a bell?

Does Beta tester ring a bell?
Forum: LIVE PLC Questions And Answers September 11th, 2018, 11:23 PM
Replies: 5
Views: 489
Posted By danw
It's a transit time ultrasonic flow meter. ...

It's a transit time ultrasonic flow meter. Entrained air (bubbles) or suspended solids are the enemy of transit time, scattering the energy in the ultrasonic 'beam'. An alternative like a PD meter...
Forum: LIVE PLC Questions And Answers September 10th, 2018, 11:21 PM
Replies: 3
Views: 462
Posted By danw
Thank you for your replies and efforts to locate...

Thank you for your replies and efforts to locate a radio. Such is Life. Dan
Forum: LIVE PLC Questions And Answers September 7th, 2018, 04:39 PM
Replies: 3
Views: 462
Posted By danw
Banner distributor? Looking for DX-80 RTD node radio

Looking for a 900MHz DX-80 node radio, old style or Performance, quad RTD inputs.

Any of the model versions below:

DX80N9X2S-P4 Performance, IP67 (SKU 18855 or 17448)
DX80N9X2S-P4C...
Forum: LIVE PLC Questions And Answers September 7th, 2018, 12:09 PM
Replies: 5
Views: 545
Posted By danw
I'm trying to recall if I ever traced a noise...

I'm trying to recall if I ever traced a noise issue to a DC power supply, and I can't recall one, and my experience goes back to older linear power supplies and the newer switch-mode power supplies...
Forum: LIVE PLC Questions And Answers September 6th, 2018, 05:05 PM
Replies: 5
Views: 488
Posted By danw
A man after my own heart. Totally agree.

A man after my own heart. Totally agree.
Forum: LIVE PLC Questions And Answers September 3rd, 2018, 02:52 PM
Replies: 7
Views: 456
Posted By danw
My experience is the same as diat150ís. All...

My experience is the same as diat150ís.

All the vendors offer an option for factory configuration (setting LRV/URV) or custom calibration to a specific range.

The ID tag can be stamped with...
Forum: LIVE PLC Questions And Answers August 30th, 2018, 12:45 PM
Replies: 6
Views: 663
Posted By danw
Modbus/TCP Client (Master) and server (slave) are...

Modbus/TCP Client (Master) and server (slave) are avaiable through either E1 or E2 Ethernet ports.

...
Showing results 1 to 25 of 500

 
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