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Search: Posts Made By: Ken Roach
Forum: LIVE PLC Questions And Answers Today, 05:49 PM
Replies: 7
Views: 59
Posted By Ken Roach
A related example: I have an HMI that writes to...

A related example: I have an HMI that writes to an array of data. I made the array one element longer than it needs to be and that last element is always a value of 999.

To determine if the...
Forum: LIVE PLC Questions And Answers Today, 04:46 PM
Replies: 4
Views: 238
Posted By Ken Roach
I've actually had bad experiences connecting a...

I've actually had bad experiences connecting a USB/Ethernet adapter directly to the Virtual Machine in VMWare. The USB pass-through technology was less stable and very slow compared to TCP/IP...
Forum: LIVE PLC Questions And Answers Today, 04:39 PM
Replies: 7
Views: 59
Posted By Ken Roach
Produced/Consumed Tags are asynchronous, similar...

Produced/Consumed Tags are asynchronous, similar to I/O. They're handled independently and there's no guarantee that a given controller will Produce two different tags immediately after one...
Forum: LIVE PLC Questions And Answers Today, 12:11 PM
Replies: 6
Views: 145
Posted By Ken Roach
I use N-Tron switches when I know the...

I use N-Tron switches when I know the temperatures will be high. Even their little 100-series are rated for -40 to 80 C (176 F). They are tough enough to be rated for traffic control and railway...
Forum: LIVE PLC Questions And Answers Today, 10:43 AM
Replies: 6
Views: 453
Posted By Ken Roach
Welcome to the PLCTalk forum community ! ...

Welcome to the PLCTalk forum community !

That generation of CompactLogix was a little complicated with regard to Electronic Data Sheet (EDS) files. You needed one for the Ethernet daughtercard,...
Forum: LIVE PLC Questions And Answers Yesterday, 08:16 PM
Replies: 4
Views: 238
Posted By Ken Roach
My VMs have two Network Adapters. The first...

My VMs have two Network Adapters.

The first is set up for ordinary DHCP on the Guest side, and configured using the ordinary VM Removable Devices -> Network Adapter settings as a NAT connection. ...
Forum: LIVE PLC Questions And Answers Yesterday, 08:03 AM
Replies: 4
Views: 147
Posted By Ken Roach
Welcome to the PLCTalk forum community ! PID...

Welcome to the PLCTalk forum community !

PID equations require an accurate measurement of time in order to function correctly. In the PLC-5 PID, you had to both enter the Loop Update time and...
Forum: LIVE PLC Questions And Answers July 16th, 2018, 10:10 PM
Replies: 4
Views: 143
Posted By Ken Roach
Thank you for the followup ! I had...

Thank you for the followup !

I had something like that last week; the product changed from a 26-pin I/O port to a 25-pin I/O port in October 2008 but the part number stayed identical and...
Forum: LIVE PLC Questions And Answers July 13th, 2018, 06:23 PM
Replies: 3
Views: 234
Posted By Ken Roach
They are physically slightly different; the CF...

They are physically slightly different; the CF card slot was moved from the bottom to the front, the serial port is in a different location, and they use slightly different RAM backup batteries.
...
Forum: LIVE PLC Questions And Answers July 13th, 2018, 02:45 PM
Replies: 8
Views: 337
Posted By Ken Roach
I admit I was only alluding to one of the issues...

I admit I was only alluding to one of the issues I've encountered: the difference between I/O and ordinary messaging.

Modbus/TCP is nice and robust because it relies on good old TCP. Dropped...
Forum: LIVE PLC Questions And Answers July 13th, 2018, 01:57 PM
Replies: 8
Views: 337
Posted By Ken Roach
The first thing you would do is stop and ask...

The first thing you would do is stop and ask yourself why you're planning on using wireless.

I've lost track of the number of times I've clenched my fist and mentally calmed myself down while...
Forum: LIVE PLC Questions And Answers July 13th, 2018, 11:28 AM
Replies: 4
Views: 191
Posted By Ken Roach
Welcome to the PLCTalk forum community ! You...

Welcome to the PLCTalk forum community !

You said that RSNetworx "uploads parameters until parameter 101 and it gives an error!".

What is the exact text of the error message ?

In RSNetworx,...
Forum: LIVE PLC Questions And Answers July 12th, 2018, 07:15 PM
Replies: 18
Views: 2,822
Posted By Ken Roach
Why so bulky ? Get a DigiSpark ATTiny85...

Why so bulky ? Get a DigiSpark ATTiny85...
Forum: LIVE PLC Questions And Answers July 12th, 2018, 04:26 PM
Replies: 2
Views: 95
Posted By Ken Roach
The PanelView Standard terminals could not run...

The PanelView Standard terminals could not run applications from the Flash card, nor transfer them automatically. You had to access the configuration mode, then perform a Save to Card or a...
Forum: LIVE PLC Questions And Answers July 12th, 2018, 03:13 PM
Replies: 10
Views: 295
Posted By Ken Roach
That +24V auxiliary power supply terminal on the...

That +24V auxiliary power supply terminal on the 1746-P2 is only rated to supply 200 mA. I've definitely seen a short circuit on that cause the PSU to "crowbar" and shut down the PLC.

Replacing...
Forum: LIVE PLC Questions And Answers July 12th, 2018, 01:15 PM
Replies: 10
Views: 442
Posted By Ken Roach
I use VMWare Workstation, because it has the...

I use VMWare Workstation, because it has the features I know I need (snapshots, Virtual network editing) and I'm familiar with setting it up.

There are two hard parts:

The first is doing a...
Forum: LIVE PLC Questions And Answers July 12th, 2018, 12:54 PM
Replies: 5
Views: 202
Posted By Ken Roach
Thank you for posting that screenshot ! That...

Thank you for posting that screenshot !

That is the simple logic that causes the effect I was describing.
Forum: LIVE PLC Questions And Answers July 12th, 2018, 10:06 AM
Replies: 18
Views: 746
Posted By Ken Roach
As mentioned, the simplest thing to do is to turn...

As mentioned, the simplest thing to do is to turn the keyswitch into RUN mode. That prohibits all edits and downloads, but allows monitoring and uploads and read/write of data.

There have been...
Forum: LIVE PLC Questions And Answers July 12th, 2018, 09:53 AM
Replies: 5
Views: 202
Posted By Ken Roach
Check your logic to see what sets the STOP...

Check your logic to see what sets the STOP command.

It is common for people to program A-B drives so that STOP is asserted whenever the START command is not asserted.

The problem is that the...
Forum: LIVE PLC Questions And Answers July 11th, 2018, 05:02 PM
Replies: 7
Views: 324
Posted By Ken Roach
I had somebody use a spray can of "graffiti...

I had somebody use a spray can of "graffiti remover" on a PanelMate years ago; the screen melted and came away like taffy.

Fortunately I had done a great job color-coding the functions, and on...
Forum: LIVE PLC Questions And Answers July 11th, 2018, 01:23 PM
Replies: 18
Views: 2,822
Posted By Ken Roach
On the system that I used the brightness control,...

On the system that I used the brightness control, I considered a Display change to be "activity". I used a Global Connection to write the Display number to the controller, and ran an ordinary PLC...
Forum: LIVE PLC Questions And Answers July 11th, 2018, 11:30 AM
Replies: 7
Views: 324
Posted By Ken Roach
I've used contact film screen protectors for a...

I've used contact film screen protectors for a few years to avoid exactly that sort of damage.

I agree that ordinary plastic polish will work. I like Starbrite Clear Plastic Restorer because I...
Forum: LIVE PLC Questions And Answers July 9th, 2018, 10:12 PM
Replies: 2
Views: 108
Posted By Ken Roach
Welcome to the PLCTalk forum community ! The...

Welcome to the PLCTalk forum community !

The power-up handler does execute just once. LD and ST routines are the most appropriate for execution in that task.

I'm not sure if you could...
Forum: LIVE PLC Questions And Answers July 6th, 2018, 04:36 PM
Replies: 1
Views: 152
Posted By Ken Roach
You cannot substitute communication modules in...

You cannot substitute communication modules in PanelView Standard terminals.

It would be neat if you could, but you can't.
Forum: LIVE PLC Questions And Answers July 6th, 2018, 04:33 PM
Replies: 2
Views: 266
Posted By Ken Roach
Welcome to the PLCTalk forum community ! The...

Welcome to the PLCTalk forum community !

The ControlLogix operating system does not allow you to programmatically modify the destination tag reference.

I'll speculate on a handful of...
Showing results 1 to 25 of 500

 
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