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Search: Posts Made By: danw
Forum: LIVE PLC Questions And Answers May 15th, 2022, 09:10 AM
Replies: 14
Views: 1,086
Posted By danw
Siemens explains its algorithm for 3 step control...

Siemens explains its algorithm for 3 step control

Three-step control with PID_3Step (http://www.plctalk.net/qanda/Three-step control with PID_3Step)


pdf: ...
Forum: LIVE PLC Questions And Answers May 15th, 2022, 09:07 AM
Replies: 14
Views: 1,086
Posted By danw
Alternative using actuator hardware slidewire...

Alternative using actuator hardware slidewire feedback option and DIN rail mount converter in order to use a 4-20mA control signal

The SKB32 actuator has an option for a 1000 ohm slidewire...
Forum: LIVE PLC Questions And Answers May 13th, 2022, 03:41 PM
Replies: 1
Views: 330
Posted By danw
If DB9 pin 1 is truly signal ground, then yes,...

If DB9 pin 1 is truly signal ground, then yes, you have the correct connections.


I have seen other devices use pin 8 for A(-), pin 3 for B(+) and pin 5 for signal ground.


Be aware that some...
Forum: LIVE PLC Questions And Answers May 11th, 2022, 11:14 PM
Replies: 2
Views: 384
Posted By danw
>Does HC-900 series same as Control Edge 900 PLC?...

>Does HC-900 series same as Control Edge 900 PLC?

The I/O modules and rack power supplies are interchangeable.

But the development software for the HC-900 CPU controllers is not the same...
Forum: LIVE PLC Questions And Answers May 6th, 2022, 10:31 AM
Replies: 5
Views: 763
Posted By danw
Which commercial Modbus Master/clients do support...

Which commercial Modbus Master/clients do support Function Code 23H? I have yet to run into one that does.


There are slave/server devices that support FC 23 and there's one odd-ball that...
Forum: LIVE PLC Questions And Answers April 25th, 2022, 01:36 PM
Replies: 9
Views: 7,039
Posted By danw
I do not know of a simulation program for the...

I do not know of a simulation program for the HC900
Forum: LIVE PLC Questions And Answers April 25th, 2022, 01:35 PM
Replies: 7
Views: 458
Posted By danw
As I read it, you wired the loop properly, but...

As I read it, you wired the loop properly, but have you powered the AI card with 24Vdc on the 24V and 0V terminals?
Forum: LIVE PLC Questions And Answers April 15th, 2022, 10:01 PM
Replies: 2
Views: 582
Posted By danw
I skim read a proposal for a secure version of...

I skim read a proposal for a secure version of the Modbus protocol some years ago, but have seen very little reference to it since. I wasn't even sure if it was adopted or not. To be honest, I...
Forum: LIVE PLC Questions And Answers March 30th, 2022, 12:05 AM
Replies: 16
Views: 1,935
Posted By danw
For a point-to-point connection (master to one...

For a point-to-point connection (master to one slave only), try swapping pin 1, B(+), and pin 8, A(-).

The definition of the the (+) driver line and the (-) driver line are not consistent...
Forum: LIVE PLC Questions And Answers March 4th, 2022, 08:30 PM
Replies: 7
Views: 1,187
Posted By danw
I vote for 24V I'm an instrument guy. My 30...

I vote for 24V

I'm an instrument guy. My 30 years of experience shows that

- the ability of all loop powered instruments to deliver a current signal is dependent upon the available voltage. ...
Forum: LIVE PLC Questions And Answers February 17th, 2022, 12:36 PM
Replies: 4
Views: 738
Posted By danw
The RTA gateway is not likely to be the weak...

The RTA gateway is not likely to be the weak link. Modbus comm reliability is subject to electrical/electronic noise sources or surges, mechanical disruption on the network bus wiring or loose...
Forum: LIVE PLC Questions And Answers February 17th, 2022, 12:28 PM
Replies: 2
Views: 519
Posted By danw
No, do not tie the extra white wire to the same...

No, do not tie the extra white wire to the same terminal as the other white wire because doing so will distort lead wire resistance compensation calculation and result in an offset error.

Wire...
Forum: LIVE PLC Questions And Answers February 13th, 2022, 09:04 PM
Replies: 31
Views: 3,365
Posted By danw
Are you using the word "tutor" for someone who...

Are you using the word "tutor" for someone who you pay to provide finished solutions that you can submit for your work, or for someone to teach you what you are not getting in the class that allows...
Forum: LIVE PLC Questions And Answers February 12th, 2022, 06:32 PM
Replies: 11
Views: 1,915
Posted By danw
Most times wireless depends on whether there's...

Most times wireless depends on whether there's power at the far end, the field sensor end. The advantage of 2-wire, loop powered 4-20mA transmitters is that the power comes from the 'control' end,...
Forum: LIVE PLC Questions And Answers February 10th, 2022, 09:52 PM
Replies: 24
Views: 2,355
Posted By danw
Purely anecdotal data, so you can take it for...

Purely anecdotal data, so you can take it for what it's worth.

The process instrumentation distributor I worked for (USA) sold
- about 3 Profibus PA instruments per year and all were for...
Forum: LIVE PLC Questions And Answers February 10th, 2022, 04:43 PM
Replies: 11
Views: 1,915
Posted By danw
4-20mA came about before my time, so I can't...

4-20mA came about before my time, so I can't confirm or deny its conceptual \design intentions, but I've seen dozens of one mile long 4-20mA signal cables in the steel mills.

The problem here is...
Forum: LIVE PLC Questions And Answers February 8th, 2022, 08:55 PM
Replies: 8
Views: 766
Posted By danw
All Aquametrics 65-series sensors are calibrated...

All Aquametrics 65-series sensors are calibrated to output 4-20mA signal over the entire measuring range of 0 to 14.0 pH. The 65 series sensors have non-adjustable outputs.

The existing AI card...
Forum: LIVE PLC Questions And Answers February 8th, 2022, 06:58 PM
Replies: 15
Views: 2,202
Posted By danw
Submersibles can do a dynamite job IF you keep...

Submersibles can do a dynamite job IF you keep the vent tube free of humidity.



When humidity gets into the vent tube, the cool water surrounding the vent tube is generally below the dewpoint...
Forum: LIVE PLC Questions And Answers February 7th, 2022, 03:34 PM
Replies: 15
Views: 2,202
Posted By danw
As much as I like hydrostatic head pressure...

As much as I like hydrostatic head pressure measurements for reliability, hydrostatic pressure only works at or below datum, the low level sensing point. With a hole in the ground there's no...
Forum: LIVE PLC Questions And Answers February 2nd, 2022, 02:35 PM
Replies: 26
Views: 3,191
Posted By danw
Magnetic fields, not radiation

Fermi Labs called one day wondering why a 'smart' pressure transmitter lost its memory every time they ran a test. I drove over and the guy took me up to the 3rd or 4th floor balcony overlooking the...
Forum: LIVE PLC Questions And Answers January 28th, 2022, 04:44 PM
Replies: 5
Views: 863
Posted By danw
It depends on the hardware behing the physical...

It depends on the hardware behing the physical connector pins. No way to answer your question without knowing what the active serial hardware is.

Further, the complexity of the hardware...
Forum: LIVE PLC Questions And Answers January 27th, 2022, 05:55 PM
Replies: 10
Views: 962
Posted By danw
Try ebay. Check out the assortment (with...

Try ebay.


Check out the assortment (with dimensions) from this ebay vendor (lots of other vendors):

...
Forum: LIVE PLC Questions And Answers January 23rd, 2022, 09:01 PM
Replies: 19
Views: 2,887
Posted By danw
Yes

Yes
Forum: LIVE PLC Questions And Answers January 20th, 2022, 11:10 AM
Replies: 5
Views: 988
Posted By danw
The Vaisala recommendation of 30m (98ft) for an...

The Vaisala recommendation of 30m (98ft) for an RS-485 cable is really unusual (pg 31 paper, 33 pdf, user manual)

You might call them and confirm that, because it violates the conventional EIA-485...
Forum: LIVE PLC Questions And Answers January 19th, 2022, 05:36 PM
Replies: 5
Views: 988
Posted By danw
I am unaware of any commercial module that is a...

I am unaware of any commercial module that is a Modbus RTU master, with a serial port and an analog output.

The typical approaches uses a small PLC that acts as a Modbus master and outputs analog...
Showing results 1 to 25 of 500

 
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