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Search: Posts Made By: drbitboy
Forum: LIVE PLC Questions And Answers Yesterday, 05:52 PM
Replies: 3
Views: 127
Posted By drbitboy
Targus AP10US1. Works okay for me,...

Targus AP10US1.


Works okay for me, including keeping the phone with hotspot going for video chats.


It's pretty old, so who know what the current model is.


The fan whines a bit at...
Forum: LIVE PLC Questions And Answers Yesterday, 02:07 PM
Replies: 13
Views: 256
Posted By drbitboy
that's what @JamesM suggestion and my code sample...

that's what @JamesM suggestion and my code sample do: [ActiveSetpoint] is the tag for the actual valve position: it will be changed to zero whenever a HIHI alarm occurs, and will not return to the...
Forum: LIVE PLC Questions And Answers Yesterday, 11:09 AM
Replies: 13
Views: 256
Posted By drbitboy
This is probably more complex than it needs to...

This is probably more complex than it needs to be.

### Recover from HIHI alarm with Reset pushbutton,
### but only if HIHI condition has cleared

ResetPB HIHI IsReset...
Forum: LIVE PLC Questions And Answers Yesterday, 10:30 AM
Replies: 18
Views: 700
Posted By drbitboy
Refactored version: cleaner with half the...

Refactored version: cleaner with half the statements.


Also reduced the times to the actual targets, because the trace provides adequate feedback to demonstrate sub-millisecond resolution, as...
Forum: LIVE PLC Questions And Answers Yesterday, 02:08 AM
Replies: 18
Views: 700
Posted By drbitboy
Not as simple as @LD's, but here is my approach,...

Not as simple as @LD's, but here is my approach, described earlier.

Caveats


The times are increased by an order of magnitude (2.75s cyclic time, instead of 275ms) so I could watch the bits....
Forum: LIVE PLC Questions And Answers April 9th, 2021, 08:00 PM
Replies: 5
Views: 197
Posted By drbitboy
Maybe the I/O scan is asynchronous with the...

Maybe the I/O scan is asynchronous with the program scan and the latter happens before the former so I1 is 0 on that first startup scan, so use the M8 Startup flag?

I1 M8 O1...
Forum: LIVE PLC Questions And Answers April 9th, 2021, 05:55 PM
Replies: 6
Views: 261
Posted By drbitboy
What @JamesM said. Also, please describe your...

What @JamesM said. Also, please describe your process more fully; here is what I am guessing from the OP:


Do you mean you have a 4 step sequence?


A/B/C = 0/0/0 (step 0 - start)
A/B/C =...
Forum: LIVE PLC Questions And Answers April 9th, 2021, 11:54 AM
Replies: 17
Views: 454
Posted By drbitboy
Just curious: do you have it configured the way...

Just curious: do you have it configured the way B. Gallimore did in that video you linked?


Kepware OPC [Tag Properties] dialog window just after 2m11s (https://youtu.be/va_ls9NsttU?t=131) in...
Forum: LIVE PLC Questions And Answers April 9th, 2021, 11:15 AM
Replies: 17
Views: 454
Posted By drbitboy
As my Dad use to say, "There is only one operation: counting."

Nice, you should get there.

Displaying the 16-bit word values in hexadecimal* will make it easier, because there will always be two hex digits per character, and there are simple mnemonics to...
Forum: LIVE PLC Questions And Answers April 9th, 2021, 10:26 AM
Replies: 18
Views: 700
Posted By drbitboy
Yes, @LD never fails to impress.

Yes, @LD never fails to impress.
Forum: LIVE PLC Questions And Answers April 8th, 2021, 10:48 PM
Replies: 17
Views: 454
Posted By drbitboy
What happens if the letters are T (ASCII code 84)...

What happens if the letters are T (ASCII code 84) and e (ASCII code 101)? If we use the [times 100 decimal] trick: 84*100 + 101 = 8501; if we decode 8501 we get 85 ASCII which is U (not T); 01...
Forum: LIVE PLC Questions And Answers April 8th, 2021, 08:43 PM
Replies: 17
Views: 454
Posted By drbitboy
Like this: word[0] = (tag3<<8) + tag4; ...

Like this:


word[0] = (tag3<<8) + tag4;
word[1] = (tag5<<8) + tag6;
...
Forum: LIVE PLC Questions And Answers April 8th, 2021, 06:54 PM
Replies: 17
Views: 454
Posted By drbitboy
Just browsing the crimson manual, there is no...

Just browsing the crimson manual, there is no direct conversion from character to the ascii code, but you could use the Find function to get pretty much the same thing e.g.




ascii_code = 32 +...
Forum: LIVE PLC Questions And Answers April 8th, 2021, 01:23 PM
Replies: 18
Views: 700
Posted By drbitboy
Awesome. I went back and watched it at...

Awesome. I went back and watched it at one-quarter speed.

With the lack of accuracy required I don't think this will be beyond what the S7-1200 can do. I would think sub-5ms 3-sigma accuracy is...
Forum: LIVE PLC Questions And Answers April 8th, 2021, 12:56 PM
Replies: 32
Views: 788
Posted By drbitboy
The bang-bang behavior suggests otherwise, and it...

The bang-bang behavior suggests otherwise, and it depends on how the output is scaled, but with the PV range set to [0-4095] and the temperature in degrees, a 1 degree change is 0.025% of full scale,...
Forum: LIVE PLC Questions And Answers April 8th, 2021, 08:36 AM
Replies: 5
Views: 505
Posted By drbitboy
Is external air always cooler than the...

Is external air always cooler than the temperature setpoint? I would think it would have to be else cooling would not be possible.

What are the external loads i.e. what else is cooling or...
Forum: LIVE PLC Questions And Answers April 8th, 2021, 08:24 AM
Replies: 18
Views: 700
Posted By drbitboy
Welcome to the conversation! It looks like...

Welcome to the conversation!

It looks like the vertical grid lines are at 0.200 intervals.


Are the units seconds or something else?
What is the required accuracy of the timings of the...
Forum: LIVE PLC Questions And Answers April 7th, 2021, 07:36 PM
Replies: 32
Views: 788
Posted By drbitboy
A gain of 75 is equivlaent to a proportional band...

A gain of 75 is equivlaent to a proportional band of 1.33% (=100/75), IIRC. That might not be right, but certainly (gain * proportional band) = some constant, and that constant is probably either 1...
Forum: LIVE PLC Questions And Answers April 7th, 2021, 03:56 PM
Replies: 32
Views: 788
Posted By drbitboy
is the Kp (or Kc) divided by 100, so the actual...

is the Kp (or Kc) divided by 100, so the actual gain is 0.5 and not 50?


Or does the divide-by-100 trick only apply to non-enhanced (that manual is a interesting read, more smoke than light)?
Forum: LIVE PLC Questions And Answers April 7th, 2021, 01:03 PM
Replies: 32
Views: 788
Posted By drbitboy
Spend some time reading about how the PID does...

Spend some time reading about how the PID does scaling (and descaling) before you get there. It should be simple, but I find the descriptions in the manual lack clarity; maybe I have just not...
Forum: LIVE PLC Questions And Answers April 7th, 2021, 12:46 PM
Replies: 14
Views: 30,009
Posted By drbitboy
I think Network 10 is correct and T4 is supposed...

I think Network 10 is correct and T4 is supposed to be high for only one cycle: it would be a flip-flop of M90.0 if T4 were the one-shot as OP expected (and as it would be in A-B). It does not need...
Forum: LIVE PLC Questions And Answers April 7th, 2021, 12:25 PM
Replies: 14
Views: 30,009
Posted By drbitboy
My experience with S7-1200 is that feeding...

My experience with S7-1200 is that feeding ~timer.Q as the EN to a timer does not create a repeating timer in Siemens. I had to feed timer.Q to a reset of the timer. It could be a branch on the...
Forum: LIVE PLC Questions And Answers April 7th, 2021, 09:25 AM
Replies: 12
Views: 530
Posted By drbitboy
Random ideas: Bit rot. Maybe memory...

Random ideas:


Bit rot.
Maybe memory is failing; run a memory scan.
Make sure this system is backed up.
Ask The Google about [error code 0xc0000005]
Forum: LIVE PLC Questions And Answers April 7th, 2021, 08:11 AM
Replies: 13
Views: 438
Posted By drbitboy
Yes, and that subnet mask should work. You could...

Yes, and that subnet mask should work. You could try 255.255.255.0, or whatever the PLC was set to be, but it should make no difference.



That default gateway is mis-configured; it should not...
Forum: LIVE PLC Questions And Answers April 7th, 2021, 07:52 AM
Replies: 13
Views: 438
Posted By drbitboy
what is the netmask of the PC?

what is the netmask of the PC?
Showing results 1 to 25 of 500

 
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