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Search: Posts Made By: daba
Forum: LIVE PLC Questions And Answers Today, 06:48 AM
Replies: 21
Views: 560
Posted By daba
Probably the best way to solve this is to...

Probably the best way to solve this is to understand why -29 is in PV_Motion_McSpeed.



It is certainly the cause of the PLC faulting.
Forum: LIVE PLC Questions And Answers Today, 06:40 AM
Replies: 21
Views: 560
Posted By daba
There is a CPT (Compute) instruction on rung 8 of...

There is a CPT (Compute) instruction on rung 8 of program file "A10_SBR_OuterWrapper_Reel_On" that is creating the negative value that is then loaded into TIMER022.PRE when it is less than 5000.
...
Forum: LIVE PLC Questions And Answers Today, 06:11 AM
Replies: 21
Views: 560
Posted By daba
A timer will cause a major fault if the PRE or...

A timer will cause a major fault if the PRE or the ACC has a negative value when the timer instruction is executed.

It is not "normal" to manipulate the ACC in code, although it may be done, so it...
Forum: LIVE PLC Questions And Answers February 22nd, 2019, 06:15 PM
Replies: 28
Views: 1,714
Posted By daba
I have to pick up on this as an incorrect...

I have to pick up on this as an incorrect interpretation....

None of the "output" type instructions set the rung-out condition to anything, they simply pass the current rung-in condition to the...
Forum: LIVE PLC Questions And Answers February 16th, 2019, 06:54 AM
Replies: 22
Views: 932
Posted By daba
Here's a thought, if you really don't want to...

Here's a thought, if you really don't want to scan subroutines all the time....

Use unique bits of Bit Files as "Intermediate Outputs" in your subroutines.

Use the same bit numbers for the...
Forum: LIVE PLC Questions And Answers February 16th, 2019, 06:31 AM
Replies: 9
Views: 537
Posted By daba
Ken's bit1 bit1 ...

Ken's


bit1 bit1
--|/|---------( )---



works for me too if you just want a bit to change every scan of the subroutine
Forum: LIVE PLC Questions And Answers February 15th, 2019, 12:01 PM
Replies: 10
Views: 515
Posted By daba
Checking the DST box in the Date/Time...

Checking the DST box in the Date/Time configuration dialog just adds (by default), 60 minutes to the DateTime and LocalDateTime attributes. I believe the CurrentValue remains the same.

You can...
Forum: LIVE PLC Questions And Answers February 15th, 2019, 08:26 AM
Replies: 2
Views: 203
Posted By daba
Ha! I have just watched a Youtube video that is...

Ha! I have just watched a Youtube video that is teaching me a lot, then realised the controller he is using is almost exactly the same as my far-east one - I have downloaded the Elation manual, and...
Forum: LIVE PLC Questions And Answers February 15th, 2019, 07:43 AM
Replies: 2
Views: 203
Posted By daba
Way OT : DMX Lighting Controller

Just acquired one of these...
Forum: LIVE PLC Questions And Answers February 15th, 2019, 07:26 AM
Replies: 22
Views: 932
Posted By daba
You could consider using MCR "zones" to put your...

You could consider using MCR "zones" to put your outputs and timers in.

Read up on it, then realise it shouldn't be called Master Control Reset, quite the reverse, as it ENABLES the rungs in the...
Forum: LIVE PLC Questions And Answers February 15th, 2019, 04:32 AM
Replies: 22
Views: 932
Posted By daba
I think the opposite way... The subroutines...

I think the opposite way... The subroutines should be solving logic, and part of that logic is to determine what the output bits and words should be at any particular time.

Forcing bits OFF when...
Forum: LIVE PLC Questions And Answers February 15th, 2019, 04:01 AM
Replies: 10
Views: 515
Posted By daba
The Logix5000 platform does not automatically...

The Logix5000 platform does not automatically adjust for DST, you have to write code to do it at the appropriate dates and times.
Forum: LIVE PLC Questions And Answers February 15th, 2019, 03:53 AM
Replies: 12
Views: 488
Posted By daba
You are starting to think correctly, why would...

You are starting to think correctly, why would the PLC reset bits in your application, it doesn't have any intelligence, and just follows orders.
Forum: LIVE PLC Questions And Answers February 15th, 2019, 03:51 AM
Replies: 12
Views: 488
Posted By daba
The PLC will NOT reset any one-shot bits itself,...

The PLC will NOT reset any one-shot bits itself, your logic determines when the ONS bits get reset, nothing else.



An ONS at the beginning of the rung will mean that the following logic on...
Forum: LIVE PLC Questions And Answers February 13th, 2019, 08:21 AM
Replies: 5
Views: 361
Posted By daba
This does not "make sure you don't lose...

This does not "make sure you don't lose connection to a module you should have communication to.."


You cannot prevent losing comms, but you can react to it more elegantly than Major-Faulting the...
Forum: LIVE PLC Questions And Answers January 24th, 2019, 06:24 AM
Replies: 7
Views: 651
Posted By daba
Usually with coldness comes dampness, and that...

Usually with coldness comes dampness, and that could potentially interfere with DeviceNet signals, or even Power.

Most likely the signals could get deteriorated because the dampness would be seen...
Forum: LIVE PLC Questions And Answers January 16th, 2019, 11:18 AM
Replies: 5
Views: 1,394
Posted By daba
When you talk about "image tables" this refers to...

When you talk about "image tables" this refers to the I/O images, and yes, in most PLCs those I/O images get transferred to and from the I/O modules at the end of the scan (not the case with A-B...
Forum: LIVE PLC Questions And Answers January 14th, 2019, 11:47 AM
Replies: 38
Views: 3,317
Posted By daba
Let us go back to the OPs post and do a bit of...

Let us go back to the OPs post and do a bit of analysis.....





Presumably there are conditional instructions on all these "latch/unlatch" pairs of rungs, and if they are both evaluated as...
Forum: LIVE PLC Questions And Answers January 9th, 2019, 06:51 AM
Replies: 21
Views: 1,380
Posted By daba
The company I used to work for for 19 years,...

The company I used to work for for 19 years, evolved over the years with more and more "IT", so they employed an IT guy...

We had to change our passwords every 30 days, not a calendar month, every...
Forum: LIVE PLC Questions And Answers January 9th, 2019, 03:41 AM
Replies: 21
Views: 1,380
Posted By daba
The last time I did anything with RA passwords...

The last time I did anything with RA passwords (many years ago), it wouldn't let me use a password I had used in the previous 12 months !!

Reminds me of the old cabbages ...
Forum: LIVE PLC Questions And Answers January 8th, 2019, 01:26 AM
Replies: 2
Views: 605
Posted By daba
Yes, I think they need to do a bit of work on the...

Yes, I think they need to do a bit of work on the Rockwell tag import, having to modify the .csv export to accommodate ALIAS tags is, IMHO, not very clever.


Another issue I have is with UDT's. ...
Forum: LIVE PLC Questions And Answers January 8th, 2019, 01:13 AM
Replies: 21
Views: 1,380
Posted By daba
One of the most useful features of the Cross...

One of the most useful features of the Cross Reference window is the column called "Destructive". By sorting on that column you can get all the "Y" entries at the top, and these are all the...
Forum: LIVE PLC Questions And Answers January 6th, 2019, 10:23 AM
Replies: 10
Views: 477
Posted By daba
Wouldn't it be a good idea to use 24V for these...

Wouldn't it be a good idea to use 24V for these pushbuttons and lamps instead, then you'd be able to dispense with the FPD
Forum: LIVE PLC Questions And Answers January 6th, 2019, 10:00 AM
Replies: 6
Views: 255
Posted By daba
Yes, I do this all the time, and yes the trick is...

Yes, I do this all the time, and yes the trick is to "Inhibit" the I/O modules so you can write to the Input tags.


EDIT : And if I remember correctly, the default configuration of CompactLogix...
Forum: LIVE PLC Questions And Answers January 6th, 2019, 08:54 AM
Replies: 21
Views: 1,380
Posted By daba
if you press the "Insert" key on your keyboard,...

if you press the "Insert" key on your keyboard, then down-arrow once, you get "Branch".

if you press the "Insert" key, then down-arrow twice, you get "Branch Level"

admittedly not a single key,...
Showing results 1 to 25 of 500

 
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