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Search: Posts Made By: drbitboy
Forum: LIVE PLC Questions And Answers Today, 05:00 AM
Replies: 14
Views: 524
Posted By drbitboy
Google or Wikipedia should be fine for those

Google or Wikipedia should be fine for those
Forum: LIVE PLC Questions And Answers February 22nd, 2020, 06:31 AM
Replies: 14
Views: 524
Posted By drbitboy
The source of the timer IN (run?) bit is a...

The source of the timer IN (run?) bit is a one-shot that is True/1 for exactly and only one scan, so the timer resets on the next scan.

TL;DR

button is an R_TRIG i.e. a rising edge trigger...
Forum: LIVE PLC Questions And Answers February 21st, 2020, 10:47 AM
Replies: 29
Views: 1,000
Posted By drbitboy
I think Jesper meant 172.16.0.x I.e. the...

I think Jesper meant 172.16.0.x

I.e. the first 256 out of 4096 addresses in the 20-bit block of the 172.16.0.0/12 orivate IPv4 subnet.

After the 1x2.16 of 192.168 or of 172.16, the 8 just seems...
Forum: LIVE PLC Questions And Answers February 19th, 2020, 12:05 PM
Replies: 37
Views: 1,885
Posted By drbitboy
My experience was similar. I had a day job and...

My experience was similar. I had a day job and did consulting on the side. A friend* handed me one of his clients with the warning that after paying promptly for the first task, that client would...
Forum: LIVE PLC Questions And Answers February 17th, 2020, 03:36 PM
Replies: 6
Views: 209
Posted By drbitboy
Looking at those versions, you may be in DLL Hell...

Looking at those versions, you may be in DLL Hell and will have to start shaving the yak i.e. installing updates on the older systems. Good luck with that.

An alternative is that the "RSLinx OPC...
Forum: LIVE PLC Questions And Answers February 17th, 2020, 03:31 PM
Replies: 11
Views: 641
Posted By drbitboy
+1 for Ron's YouTube, although one of its central...

+1 for Ron's YouTube, although one of its central points does not strictly apply to ControlLogix and CompactLogix.

Another freebie option is this combination:

RSLogixEmulate500
RSLinxClassix...
Forum: LIVE PLC Questions And Answers February 17th, 2020, 03:02 PM
Replies: 6
Views: 263
Posted By drbitboy
Yae, em nietehr.

Yae, em nietehr.
Forum: LIVE PLC Questions And Answers February 17th, 2020, 02:44 PM
Replies: 6
Views: 263
Posted By drbitboy
Well, I was going to say I didn't know what a...

Well, I was going to say I didn't know what a vavle was, but then I got 2.65Mhits on the google: waste vavles; water vavles; 3-way vavles (but no 3-wya vavles;))

Rugn 4 looks suscipious to me:
...
Forum: LIVE PLC Questions And Answers February 17th, 2020, 02:33 PM
Replies: 4
Views: 287
Posted By drbitboy
Wink This doesn't answer your question, but you did...

This doesn't answer your question, but you did ask for any thoughts.

Unless I forgot something in the past four+ decades, the differential equation for motion speed you suggested will never get...
Forum: LIVE PLC Questions And Answers February 16th, 2020, 11:52 AM
Replies: 57
Views: 2,021
Posted By drbitboy
Is it a matter of trust, or is it wanting (or...

Is it a matter of trust, or is it wanting (or needing) a consistent set of inputs to work with throughout the scan?

"Left to right, and down" means the abscissa is signal* and the ordinate is...
Forum: LIVE PLC Questions And Answers February 16th, 2020, 07:33 AM
Replies: 2
Views: 3,816
Posted By drbitboy
The best thing about the internet is that it...

The best thing about the internet is that it lowers the cost to publish.

The worst thing about the internet is that it lowers the cost to publish.
Forum: LIVE PLC Questions And Answers February 16th, 2020, 06:53 AM
Replies: 16
Views: 777
Posted By drbitboy
Fortran has the same restriction, or at least one...

Fortran has the same restriction, or at least one of the many incarnations I used once did. However, you could call subroutine A, then have A call subroutine B, and B could call A; let's call it...
Forum: LIVE PLC Questions And Answers February 16th, 2020, 05:18 AM
Replies: 16
Views: 777
Posted By drbitboy
I dunno if that sounds like a good idea in the...

I dunno if that sounds like a good idea in the real-world, cause-mayhem realm of PLCs, but in the non-real world of procedural languages I am comfortable having an AOI-equivalent call itself to an...
Forum: LIVE PLC Questions And Answers February 15th, 2020, 05:50 PM
Replies: 57
Views: 2,021
Posted By drbitboy
[QUOTE=Ron Beaufort;840362]CompactLogix is...

[QUOTE=Ron Beaufort;840362]CompactLogix is different[QUOTE]

My brother told me in some programs he buffers all inputs into local memory in the top rung, and outputs buffered bits at the bottom...
Forum: LIVE PLC Questions And Answers February 15th, 2020, 04:33 PM
Replies: 57
Views: 2,021
Posted By drbitboy
Classic pedagogy, like a presbyterian sermon: ...

Classic pedagogy, like a presbyterian sermon: tell 'em; tell 'em again; tell 'em what you told 'em.

+1:congrats:
Forum: LIVE PLC Questions And Answers February 15th, 2020, 03:29 PM
Replies: 57
Views: 2,021
Posted By drbitboy
"There can be some serious shock hazards in this...

"There can be some serious shock hazards in this particular topic." - Video 2

Love it :); too bad you're not in the business any more.

Btw, I got it right for video 1, and I think I know why,...
Forum: LIVE PLC Questions And Answers February 15th, 2020, 05:02 AM
Replies: 29
Views: 1,000
Posted By drbitboy
Yeah, but it's free! ;););););)

Yeah, but it's free!
;););););)
Forum: LIVE PLC Questions And Answers February 15th, 2020, 04:50 AM
Replies: 14
Views: 734
Posted By drbitboy
Rabbit trails, to you, until, we meet, again

Well, this thread having been re-purposed to pick-on-Peter day, I'll make another deposit.



Even if it works as intended, that is irrelevant in the "bubba scenario."

When something else in...
Forum: LIVE PLC Questions And Answers February 14th, 2020, 09:40 PM
Replies: 14
Views: 734
Posted By drbitboy
I think he is absolutely correct, just his...

I think he is absolutely correct, just his definition of crude is different from anyone else's.
Forum: LIVE PLC Questions And Answers February 14th, 2020, 06:56 PM
Replies: 14
Views: 734
Posted By drbitboy
Really? I have a scan time of order 1-10ms, plus...

Really? I have a scan time of order 1-10ms, plus noise, and I am running a timer order 100ms, and you are telling me I may not scan exactly at the 100ms expiry, each time, every time? Wow, I never...
Forum: LIVE PLC Questions And Answers February 14th, 2020, 12:58 PM
Replies: 14
Views: 734
Posted By drbitboy
As you wish, and thanks!

As you wish, and thanks!
Forum: LIVE PLC Questions And Answers February 14th, 2020, 12:49 PM
Replies: 57
Views: 2,021
Posted By drbitboy
Here's the thing, and I think someone else...

Here's the thing, and I think someone else already expressed this: NO and NC actually mean different things when referring to a physical switch and an instruction on a PLC ladder rung (or ST or FBD...
Forum: LIVE PLC Questions And Answers February 14th, 2020, 11:19 AM
Replies: 14
Views: 734
Posted By drbitboy
Ooh, nice catch! This was intended as a proof of...

Ooh, nice catch! This was intended as a proof of concept, but I appreciate this forest vs. trees insight into how an actual application could be implemented and interface with the Real World.

...
Forum: LIVE PLC Questions And Answers February 14th, 2020, 10:50 AM
Replies: 14
Views: 734
Posted By drbitboy
Hol' on there Baba Louie! I know for a fact...

Hol' on there Baba Louie!

I know for a fact that the person I was referring does know how to utilize and troubleshoot indirect addressing properly; they have a successful career of more than a few...
Forum: LIVE PLC Questions And Answers February 14th, 2020, 03:17 AM
Replies: 14
Views: 734
Posted By drbitboy
Settle a bet

I have three ladder solutions to a deadtime task: a discrete input rising edge generates a 1s discrete output pulse after a delay of 20s, which delay can be adjusted via HMI (yes, this started on...
Showing results 1 to 25 of 199

 
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