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Search: Posts Made By: drbitboy
Forum: LIVE PLC Questions And Answers Today, 06:45 PM
Replies: 8
Views: 118
Posted By drbitboy
@daba I know how signed DINTs work (no different...

@daba I know how signed DINTs work (no different than unsigned, of course; I am drbitboy, after all ;)), I was only curious if the overflow flag caused the PLC to fault. I think I remember that...
Forum: LIVE PLC Questions And Answers Today, 05:38 PM
Replies: 40
Views: 23,288
Posted By drbitboy
Overflow doesn't cause a minor or major fault...

Overflow doesn't cause a minor or major fault then?
Forum: LIVE PLC Questions And Answers Today, 04:47 PM
Replies: 11
Views: 181
Posted By drbitboy
Just thinking: perhaps an NO of the pump output...

Just thinking: perhaps an NO of the pump output bit should also be in series with the NO of the low level switch on the rung feeding the timer (rung 0).



An alternate approach would be to put...
Forum: LIVE PLC Questions And Answers Today, 04:30 PM
Replies: 22
Views: 709
Posted By drbitboy
Yes, PKZIP format* actually, so even Windows...

Yes, PKZIP format* actually, so even Windows Explorer can open it if the filename extension is changed to .ZIP.


* The first two bytes are PK. 7-zip is an app that reads various archive...
Forum: LIVE PLC Questions And Answers Today, 04:25 PM
Replies: 40
Views: 23,288
Posted By drbitboy
Hmm, interesting. It seems to be counting scans....

Hmm, interesting. It seems to be counting scans.


But could that not be done in one instruction: [ADD dint_bits 1 dint_bits]?


What keeps the counter accumulator from overflowing?
Forum: LIVE PLC Questions And Answers Today, 10:28 AM
Replies: 5
Views: 170
Posted By drbitboy
What happens if you remove the rung with the...

What happens if you remove the rung with the second AOI, or set the rung to false e.g. put an AFI, (or [XIC output XIO output]) on that rung just before the second AOI?


Alternatively put in a...
Forum: LIVE PLC Questions And Answers Today, 10:02 AM
Replies: 11
Views: 181
Posted By drbitboy
whoops, I saw TOF as an invalid label in a GX...

whoops, I saw TOF as an invalid label in a GX Dev. manual and assumed.


My bad, thanks!
Forum: LIVE PLC Questions And Answers Today, 09:53 AM
Replies: 5
Views: 242
Posted By drbitboy
More background: ...

More background: http://www.plctalk.net/qanda/showthread.php?t=120097
Forum: LIVE PLC Questions And Answers Today, 09:35 AM
Replies: 3
Views: 123
Posted By drbitboy
1) @kolyur nailed it. 2) an alternative...

1) @kolyur nailed it.


2) an alternative approach to solve the problem:


When an outlier is detectedi:
i) don't add anything to the sum
ii) decrement the divisor (which started at 100)...
Forum: LIVE PLC Questions And Answers Today, 09:20 AM
Replies: 3
Views: 123
Posted By drbitboy
Google "resistant average outlier" Using...

Google "resistant average outlier"


Using a median is one way to deal with this, assuming the outliers are either few or occur on both sides of the target value.
Forum: LIVE PLC Questions And Answers Today, 09:15 AM
Replies: 11
Views: 181
Posted By drbitboy
You've already got Parky's solution, which has...

You've already got Parky's solution, which has the added benefit of being easy to understand. There is also the TOF instruction, which sometimes seems the devil's spawn, but it was designed for...
Forum: LIVE PLC Questions And Answers Yesterday, 05:13 PM
Replies: 15
Views: 476
Posted By drbitboy
I will wager that control scheme is chasing the...

I will wager that control scheme is chasing the noise and adding to it. If the control scheme was changed to only make the adjustment when the measured value was outside a deadband bracketing the...
Forum: LIVE PLC Questions And Answers Yesterday, 01:13 PM
Replies: 6
Views: 300
Posted By drbitboy
@EMILLER233: Are you asking how to take...

@EMILLER233:


Are you asking how to take two discrete inputs ([port-starboard] and [starboard main-remote]) and six analog inputs (two for each of three joysticks), choose which joystick is...
Forum: LIVE PLC Questions And Answers Yesterday, 11:06 AM
Replies: 40
Views: 23,288
Posted By drbitboy
Necro-thread alert!

Necro-thread alert.


Stumbled onto this great thread today.

An alternative suggestion: test alluz on and off at the end of the program i.e.



ZERO
Forum: LIVE PLC Questions And Answers Yesterday, 10:40 AM
Replies: 8
Views: 338
Posted By drbitboy
With a nod to RonB, one could perhaps posit that...

With a nod to RonB, one could perhaps posit that the proper names for the always "on" and "off" bits would be ONE and ZERO, because, while rungs can be true or false, bits can only be 0 or 1.

...
Forum: LIVE PLC Questions And Answers Yesterday, 09:53 AM
Replies: 6
Views: 300
Posted By drbitboy
https://www.axiomatic.com/converter.pdf ?

https://www.axiomatic.com/converter.pdf


?
Forum: LIVE PLC Questions And Answers January 18th, 2021, 04:51 PM
Replies: 45
Views: 1,779
Posted By drbitboy
@GaryS, I have to ask: does your phone keep...

@GaryS, I have to ask: does your phone keep correcting neutral to natural? Or is this something new I should learn?


P.S. I worked with some folks in the dairy industry a while ago, and "stray...
Forum: LIVE PLC Questions And Answers January 18th, 2021, 04:45 PM
Replies: 25
Views: 584
Posted By drbitboy
I didn't show one because, as I stated,...

I didn't show one because,


as I stated, it appears the OP is interested in getting experience working with an actual RSLogix PID instruction,
been there, done that (first time was nearly 4...
Forum: LIVE PLC Questions And Answers January 18th, 2021, 02:17 PM
Replies: 8
Views: 338
Posted By drbitboy
It's a style query; it's a want not a need: ...

It's a style query; it's a want not a need:


I think @dmroeder provdided the answer, but unless the OP replies we will never know. E.g. the equivalent of summat like this:



VAR_GLOBAL
...
Forum: LIVE PLC Questions And Answers January 18th, 2021, 11:44 AM
Replies: 25
Views: 584
Posted By drbitboy
Whoops, my mistake. I wonder why I did that...

Whoops, my mistake. I wonder why I did that then.


[Update: I think I wanted a bumpless mode switch]




Anyway, thanks, Ron!
Forum: LIVE PLC Questions And Answers January 18th, 2021, 10:56 AM
Replies: 25
Views: 584
Posted By drbitboy
I coded a PID in ladder for MicroLogix 1100,...

I coded a PID in ladder for MicroLogix 1100, which does not have a PID instruction; the .RSS file, which may work for SLC, is here:

...
Forum: LIVE PLC Questions And Answers January 18th, 2021, 08:07 AM
Replies: 25
Views: 584
Posted By drbitboy
Thank you for reiterating what was stated a dozen...

Thank you for reiterating what was stated a dozen posts ago (https://www.plctalk.net/qanda/showthread.php?p=874113#post874113).
Forum: LIVE PLC Questions And Answers January 17th, 2021, 09:33 PM
Replies: 25
Views: 584
Posted By drbitboy
The OP's problem is that they do not have the PID...

The OP's problem is that they do not have the PID instruction in the PLC they are using.
Forum: LIVE PLC Questions And Answers January 17th, 2021, 05:15 PM
Replies: 14
Views: 328
Posted By drbitboy
This is too funny. Mine was the test program. ...

This is too funny. Mine was the test program.


OP started with [1000 1000] i.e. 88h, in the FRD source, and was expecting to see 88 "decimal" (1011000) in the FRD dest, but was not for some...
Forum: LIVE PLC Questions And Answers January 17th, 2021, 12:24 PM
Replies: 25
Views: 584
Posted By drbitboy
Update: it's LogixPro, cf....

Update: it's LogixPro, cf. http://thelearningpit.com/, 15-day trial, priced at $24 currently for the pandemic.



There is a non-Rockwell programmer-emulator tool (RSLogix500-style; maybe for...
Showing results 1 to 25 of 500

 
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