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Search: Posts Made By: Ken Roach
Forum: LIVE PLC Questions And Answers Yesterday, 05:27 PM
Replies: 4
Views: 71
Posted By Ken Roach
The bad news is that the port might not be...

The bad news is that the port might not be configured for DF1 Full Duplex if there is a servo connected to it.

What make and model of servo ? When the servo is plugged in, is the Channel 0 LED...
Forum: LIVE PLC Questions And Answers Yesterday, 05:24 PM
Replies: 4
Views: 71
Posted By Ken Roach
First, it's almost certainly an SLC-5/04 if it...

First, it's almost certainly an SLC-5/04 if it has a round 8-pin connector on the front. That's actually wired internally to the Data Highway Plus connector (the 3-pin Combicon-style).

You...
Forum: LIVE PLC Questions And Answers Yesterday, 05:20 PM
Replies: 5
Views: 176
Posted By Ken Roach
In general you will want the new controller's...

In general you will want the new controller's firmware to match that of the old controller.

The firmware utility is called ControlFlash. Sometimes it's "kitted" so that when you install a new...
Forum: LIVE PLC Questions And Answers November 21st, 2017, 10:06 PM
Replies: 5
Views: 176
Posted By Ken Roach
>1769-32E supports fewer cards than the 1769-L35E...

>1769-32E supports fewer cards than the 1769-L35E

Correct; the L35E supports 30 I/O modules, while the L32E supports 16.

I will add a detail to JeremyM's Step 2:

The IP address of the...
Forum: LIVE PLC Questions And Answers November 21st, 2017, 06:24 PM
Replies: 3
Views: 131
Posted By Ken Roach
Data Links are by far the easiest way to read the...

Data Links are by far the easiest way to read the output current from the drive.

Doing explicit messages with an SLC and 1747-SDN that old would require the painful old structured buffer logic. ...
Forum: LIVE PLC Questions And Answers November 21st, 2017, 02:39 PM
Replies: 4
Views: 118
Posted By Ken Roach
Write a polite e-mail to your local Rockwell...

Write a polite e-mail to your local Rockwell sales engineer letting them know that the contractors doing their support websites need a little real-world refresher. It's silly that the product name...
Forum: LIVE PLC Questions And Answers November 21st, 2017, 12:24 PM
Replies: 18
Views: 524
Posted By Ken Roach
Drewster, that's exactly the behavior my test...

Drewster, that's exactly the behavior my test bench system gives me as well, whether I unplug the adapter or cut power to the adapter and Inputs simultaneously by opening a fuse block.

In my case,...
Forum: LIVE PLC Questions And Answers November 21st, 2017, 11:52 AM
Replies: 18
Views: 524
Posted By Ken Roach
Do you mean input signals or output signals ? ...

Do you mean input signals or output signals ? In general, input data values should remain at the last known state when an I/O connection fails.

A bit of info I'll contribute; the status of...
Forum: LIVE PLC Questions And Answers November 20th, 2017, 05:32 PM
Replies: 4
Views: 294
Posted By Ken Roach
The POINTBus "backplane" is basically a tiny...

The POINTBus "backplane" is basically a tiny DeviceNet network, so you can logically connect 63 POINT modules to it.

The practical limit is how much 5V power is available to run the backplane...
Forum: LIVE PLC Questions And Answers November 17th, 2017, 08:46 PM
Replies: 21
Views: 650
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: 21
Views: 650
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: 167
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: 337
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: 167
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: 362
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: 793
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: 186
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: 228
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: 138
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: 362
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: 184
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: 243
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: 376
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: 376
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: 376
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...
Showing results 1 to 25 of 500

 
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