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Search: Posts Made By: Mispeld
Forum: LIVE PLC Questions And Answers Yesterday, 04:12 PM
Replies: 8
Views: 192
Posted By Mispeld
Per technote 54960 "Indirect Access to Tag Data...

Per technote 54960 "Indirect Access to Tag Data addressing in ControlLogix":

"Operation is asynchronous to program scan, via system overhead time-slice."

While this message-based approach is...
Forum: LIVE PLC Questions And Answers Yesterday, 12:24 PM
Replies: 8
Views: 192
Posted By Mispeld
The way I read this, there is a need for a two...

The way I read this, there is a need for a two dimensional array where one dimension is a food type and the other is an (undefined) integer index. One approach would be to create the two dimension...
Forum: LIVE PLC Questions And Answers Yesterday, 07:41 AM
Replies: 1
Views: 77
Posted By Mispeld
I would create a trend chart that monitors the...

I would create a trend chart that monitors the PIDE Auto and Manual output bits, along with the AutoReq and ManualReq input bits to make sure they are taking effect when you think they are. Also...
Forum: LIVE PLC Questions And Answers August 8th, 2018, 02:42 PM
Replies: 11
Views: 174
Posted By Mispeld
In Logix Rev 18, at least, the MID instruction is...

In Logix Rev 18, at least, the MID instruction is not limited to the default 80-character string type. So long as your string can fit into a user-defined string type of the desired length, MID will...
Forum: LIVE PLC Questions And Answers August 3rd, 2018, 08:04 AM
Replies: 6
Views: 343
Posted By Mispeld
Is it possible for you to post an image of a...

Is it possible for you to post an image of a trend charts showing the controller output percent and level measurement? Ideally, this would be during a time when the process is somewhat stable (i.e.,...
Forum: LIVE PLC Questions And Answers August 3rd, 2018, 07:46 AM
Replies: 6
Views: 240
Posted By Mispeld
This clever approach has the feature of working...

This clever approach has the feature of working over multiple scans. Therefore it might be advisable to copy the string array into a working copy for the FSC before starting, in case the base array...
Forum: LIVE PLC Questions And Answers August 2nd, 2018, 03:06 PM
Replies: 6
Views: 240
Posted By Mispeld
Could these part numbers be stored as DINT...

Could these part numbers be stored as DINT values, or too many digits and/or embedded non-digits?

If you can put them in a DINT array, it would be more efficient to sort and then scan the array...
Forum: LIVE PLC Questions And Answers August 1st, 2018, 03:50 PM
Replies: 13
Views: 170
Posted By Mispeld
It's a stretch, but maybe a critical DC common...

It's a stretch, but maybe a critical DC common was being provided by the home switch wiring that was reconnected. Or maybe multiple loose wires were found and fixed during troubleshooting.
Forum: LIVE PLC Questions And Answers August 1st, 2018, 12:20 PM
Replies: 13
Views: 170
Posted By Mispeld
I re-reading this I see that I wrote the actions...

I re-reading this I see that I wrote the actions backwards, and would be going to the drive next. As noted, check for loose connections as part of this process.
Forum: LIVE PLC Questions And Answers August 1st, 2018, 10:43 AM
Replies: 13
Views: 170
Posted By Mispeld
Sounds like from the first post that if you have...

Sounds like from the first post that if you have feedback turned off, and then rotate the shaft by hand, you can see the position changing as expected. If so, the feedback cable is less likely to be...
Forum: LIVE PLC Questions And Answers August 1st, 2018, 10:20 AM
Replies: 13
Views: 170
Posted By Mispeld
Can you run the motor uncoupled from the load? ...

Can you run the motor uncoupled from the load? Maybe a mechanical issue?
Could also try slower accel/decel/velocity with load -- if no following error then mechanical or motor issue is more likely.
Forum: LIVE PLC Questions And Answers July 24th, 2018, 07:32 AM
Replies: 15
Views: 563
Posted By Mispeld
I think this would just be a matter of comparing...

I think this would just be a matter of comparing ASCII codes of what was sent by the PLC and what was received by the camera. One possible watch-out is byte swapping in the logic and communication...
Forum: LIVE PLC Questions And Answers July 23rd, 2018, 01:36 PM
Replies: 15
Views: 563
Posted By Mispeld
It appears that the Cognex tech note in the...

It appears that the Cognex tech note in the previous reply has a direct example of Micrologix native mode commands. Reply if you have any trouble accessing it.
Forum: LIVE PLC Questions And Answers July 23rd, 2018, 01:17 PM
Replies: 15
Views: 563
Posted By Mispeld
We used explicit messaging and native mode...

We used explicit messaging and native mode commands many years ago (before EIP), and from what I recall, there was nothing in the spreadsheet to support reading and writing data. It was all on the...
Forum: LIVE PLC Questions And Answers July 21st, 2018, 10:23 AM
Replies: 11
Views: 628
Posted By Mispeld
This approach would be pretty safe...

This approach would be pretty safe...
Forum: LIVE PLC Questions And Answers July 18th, 2018, 07:23 AM
Replies: 15
Views: 563
Posted By Mispeld
The document available at the following link...

The document available at the following link shows an example of SLC-to-Cognex messaging for Native Mode commands starting on page 28. It is not be a direct match to the Micrologix environment, but...
Forum: LIVE PLC Questions And Answers July 17th, 2018, 03:56 PM
Replies: 15
Views: 563
Posted By Mispeld
Verify on the Multihop tab that you have the IP...

Verify on the Multihop tab that you have the IP address of the camera set correctly.

I have not done this with Micrologix, but that step is necessary for SLC.
Forum: LIVE PLC Questions And Answers July 9th, 2018, 02:16 PM
Replies: 17
Views: 1,100
Posted By Mispeld
The reasons why I suggested an AOI with a LBL/JMP...

The reasons why I suggested an AOI with a LBL/JMP construct over other methods of indexing through an array are:

1. Run-time Execution Efficiency

As compared with a FOR loop with a single-rung...
Forum: LIVE PLC Questions And Answers July 6th, 2018, 02:51 PM
Replies: 17
Views: 1,100
Posted By Mispeld
If you only want to set all of the accumulators...

If you only want to set all of the accumulators to zero, you should also be able to use the FAL instruction for this purpose. That would not be the same as using the RES instruction in a loop, which...
Forum: LIVE PLC Questions And Answers July 5th, 2018, 02:56 PM
Replies: 8
Views: 580
Posted By Mispeld
Try a Google search with "energy infrastructure...

Try a Google search with "energy infrastructure malware". Among the hits you may get is this article from The Guardian from March of this year:

US accuses Russia of cyber-attack on energy sector...
Forum: LIVE PLC Questions And Answers June 29th, 2018, 08:18 AM
Replies: 2
Views: 288
Posted By Mispeld
The FIR filter will have very high attenuation of...

The FIR filter will have very high attenuation of specific frequencies when effectively matched. With this relatively high (20 khz) sample frequency relative to the filter objective (50 - 60 hz),...
Forum: LIVE PLC Questions And Answers June 25th, 2018, 07:23 AM
Replies: 10
Views: 507
Posted By Mispeld
Some of these products are under $10K. We have...

Some of these products are under $10K. We have been using them for many years, through buy-outs with Beta now owning the product line.

Beta Laserspeed Product Line...
Forum: LIVE PLC Questions And Answers June 19th, 2018, 07:27 AM
Replies: 4
Views: 375
Posted By Mispeld
The incremental (or velocity) form of the PID...

The incremental (or velocity) form of the PID computation does not accumulate integral action like the positional form, and will not "wind up" when clamped at an upper or lower limit. It would be...
Forum: LIVE PLC Questions And Answers June 8th, 2018, 01:46 PM
Replies: 20
Views: 965
Posted By Mispeld
I have used Cutler-Hammer sensors for this...

I have used Cutler-Hammer sensors for this purpose. For example, from Allied Electronics:

ECSJ Series Current Switch CurrentWatch Current Sensors...
Forum: LIVE PLC Questions And Answers June 7th, 2018, 12:59 PM
Replies: 16
Views: 975
Posted By Mispeld
One process to consider is this: 1. Create two...

One process to consider is this:
1. Create two or three of the sequentially numbered tags in the AOI.
2. Export the AOI to the .L5X file.
3. Open the exported AOI in a text editor and find the...
Showing results 1 to 25 of 305

 
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