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Search: Posts Made By: Ken Roach
Forum: LIVE PLC Questions And Answers November 17th, 2017, 08:46 PM
Replies: 17
Views: 391
Posted By Ken Roach
If you know the MicroLogix model number and the...

If you know the MicroLogix model number and the Output number you can look up whether it's solid-state or relay.

MicroLogix 1200 model numbers with a "W" have exclusively Relay outputs, while ones...
Forum: LIVE PLC Questions And Answers November 17th, 2017, 05:35 PM
Replies: 17
Views: 391
Posted By Ken Roach
Is it a solid-state output or a relay output ? ...

Is it a solid-state output or a relay output ?

Some solid-state outputs will "leak" a very small amount of current, so you can detect it at the output with a meter, especially if there is no load...
Forum: LIVE PLC Questions And Answers November 17th, 2017, 03:47 PM
Replies: 6
Views: 152
Posted By Ken Roach
>setup a subroutine that maps the program outputs...

>setup a subroutine that maps the program outputs to the actual outputs depending on which tool is selected on the panelview.

That's a good description of what I call the "I/O abstraction...
Forum: LIVE PLC Questions And Answers November 17th, 2017, 03:41 PM
Replies: 9
Views: 294
Posted By Ken Roach
The Micro 850 can't act as a cyclic I/O adapter. ...

The Micro 850 can't act as a cyclic I/O adapter. That's simply not what it's for.

In my opinion, using MSG instructions instead of cyclic I/O connections is an unreliable and disfavored...
Forum: LIVE PLC Questions And Answers November 17th, 2017, 02:37 PM
Replies: 6
Views: 152
Posted By Ken Roach
What exactly are your trying to do, and why ? ...

What exactly are your trying to do, and why ?

You cannot change a Tag Name through any HMI, least of all a PanelView Plus.

That would require the components of Studio 5000 that perform edits to...
Forum: LIVE PLC Questions And Answers November 16th, 2017, 12:49 PM
Replies: 10
Views: 346
Posted By Ken Roach
I'm just explaining why your money would be...

I'm just explaining why your money would be wasted entirely on a general-purpose Ethernet/RS232 converter. If your budget is insufficient to fulfill the project requirements, there is no technical...
Forum: LIVE PLC Questions And Answers November 16th, 2017, 12:04 PM
Replies: 25
Views: 768
Posted By Ken Roach
8 MB, or 8 GB ? The original PanelView 550...

8 MB, or 8 GB ?

The original PanelView 550 terminals in the late 1990's used a type of flash memory card called "linear flash". I had a parallel-port connected "DataBook" drive that would let my...
Forum: LIVE PLC Questions And Answers November 16th, 2017, 12:33 AM
Replies: 3
Views: 177
Posted By Ken Roach
Oh, hi Terry ! Small world here on the...

Oh, hi Terry ! Small world here on the Internet !

I've always been told that GSV's "take some overhead time" but have never really measured to see what their impact on scantime is, or whether...
Forum: LIVE PLC Questions And Answers November 15th, 2017, 06:35 PM
Replies: 8
Views: 220
Posted By Ken Roach
In general, SLC-500 controller backplane...

In general, SLC-500 controller backplane diagnostics are very good. The most likely explanation is that the module in Slot 2 is bad.

It could be that the I/O module in Slot 2 has been damaged,...
Forum: LIVE PLC Questions And Answers November 14th, 2017, 07:54 PM
Replies: 4
Views: 132
Posted By Ken Roach
Welcome to the PLCTalk Forum community ! The...

Welcome to the PLCTalk Forum community !

The one-shot (ONS) instruction means that the preceding conditional instructions must go from FALSE to TRUE.

Because the preceding instructin is a GRT,...
Forum: LIVE PLC Questions And Answers November 14th, 2017, 02:03 PM
Replies: 10
Views: 346
Posted By Ken Roach
The problem is that the general-purpose devices...

The problem is that the general-purpose devices don't understand the DF1 protocol that the MicroLogix speaks, so they don't have any way to distinguish data from the serial side (the replies to DF1...
Forum: LIVE PLC Questions And Answers November 13th, 2017, 02:27 PM
Replies: 4
Views: 177
Posted By Ken Roach
Mispeld is exactly correct; this is the ordinary...

Mispeld is exactly correct; this is the ordinary byte order for the COP instruction.

The Length of the COP instruction should be "2" because the Length is the number of destination array elements...
Forum: LIVE PLC Questions And Answers November 13th, 2017, 10:43 AM
Replies: 5
Views: 234
Posted By Ken Roach
You almost certainly don't want a PING command. ...

You almost certainly don't want a PING command. PING doesn't tell you anything about the status or type of device on the network.

You probably want a watchdog function. I usually do this by...
Forum: LIVE PLC Questions And Answers November 12th, 2017, 09:37 PM
Replies: 10
Views: 358
Posted By Ken Roach
Above, in the first paragraph where it reads...

Above, in the first paragraph where it reads "configured for 2-Slot addressing", it should read "configured for 1/2-Slot addressing". 32-point modules are sometimes used in 1/2-Slot Addressing...
Forum: LIVE PLC Questions And Answers November 12th, 2017, 11:38 AM
Replies: 10
Views: 358
Posted By Ken Roach
Hagos, Thank you for your contribution. ...

Hagos,

Thank you for your contribution. Many systems that use "1/2 Slot" addressing also use 32 point modules for the highest physical density available in the 1771 platform. So it is possible...
Forum: LIVE PLC Questions And Answers November 9th, 2017, 09:06 PM
Replies: 10
Views: 358
Posted By Ken Roach
The 1771 I/O platform was developed in the...

The 1771 I/O platform was developed in the PLC-2/3 era, when 8-point discrete modules were the standard. A "Group" was actually two slots, named "0" and "1". In the modern era, this is called...
Forum: LIVE PLC Questions And Answers November 9th, 2017, 04:45 PM
Replies: 2
Views: 150
Posted By Ken Roach
Get in touch with your local RA office, who can...

Get in touch with your local RA office, who can get you in touch with Commercial Engineering at Rockwell, who will be able to help.

Rockwell has used GM Nameplate in Seattle as their label vendor...
Forum: LIVE PLC Questions And Answers November 9th, 2017, 01:58 PM
Replies: 10
Views: 358
Posted By Ken Roach
I agree that you're going to want to look at the...

I agree that you're going to want to look at the actual I/O image while observing the indicators on the modules themselves to help verify that your assumptions are correct.

The paired 32-point...
Forum: LIVE PLC Questions And Answers November 9th, 2017, 12:03 PM
Replies: 2
Views: 231
Posted By Ken Roach
I use the A-B high density terminal block style...

I use the A-B high density terminal block style relays frequently for small solenoids; the 700-HLS1Z24 is my preferred unit with a screw-terminal base.

Yes, they leak a small amount of current; ...
Forum: LIVE PLC Questions And Answers November 8th, 2017, 06:25 PM
Replies: 20
Views: 410
Posted By Ken Roach
You may not want to do it, but it is still the...

You may not want to do it, but it is still the lowest-effort, highest-reliability way to accomplish what you want.

Or, just run VNC Viewer on your third terminal and use it to remote to one or the...
Forum: LIVE PLC Questions And Answers November 6th, 2017, 09:08 PM
Replies: 11
Views: 461
Posted By Ken Roach
First, you need to understand what you're asking...

First, you need to understand what you're asking the system to do.

A "Safety Instrumented System" (SIS) for safe shutdown of a process is a different sort of control system than a discrete Safety...
Forum: LIVE PLC Questions And Answers November 6th, 2017, 08:54 PM
Replies: 3
Views: 172
Posted By Ken Roach
I didn't know about that new feature, Garry ! ...

I didn't know about that new feature, Garry ! Thanks for posting the link.

If it makes you feel any better, the on-screen keypad in my preferred HMI (Indusoft Web Studio) is almost as bad,...
Forum: LIVE PLC Questions And Answers November 6th, 2017, 03:31 PM
Replies: 7
Views: 223
Posted By Ken Roach
The "Slave ID" address byte value in a Modbus...

The "Slave ID" address byte value in a Modbus serial network frame can be 0 (broadcast) or 1-247.

Addresses 248-255 are reserved for "future expansion of the protocol" and should not be used.
...
Forum: LIVE PLC Questions And Answers November 4th, 2017, 11:49 AM
Replies: 4
Views: 275
Posted By Ken Roach
Are you using FactoryTalk View SE, or FactoryTalk...

Are you using FactoryTalk View SE, or FactoryTalk View ME (PanelView Plus) ?

If you are using a PC-based HMI system, one preferred method to keep PLC clocks in synch with computer clocks is the...
Forum: LIVE PLC Questions And Answers November 2nd, 2017, 12:29 PM
Replies: 3
Views: 131
Posted By Ken Roach
Welcome to the PLCTalk forum community ! Sorry...

Welcome to the PLCTalk forum community ! Sorry you've got a negative first interaction, though.

Verify that you have a good +24V DC input for the controller by measuring the power input...
Showing results 1 to 25 of 500

 
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