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Search: Posts Made By: Ken Roach
Forum: LIVE PLC Questions And Answers Today, 01:08 PM
Replies: 2
Views: 41
Posted By Ken Roach
What is the exact Modbus data table address you...

What is the exact Modbus data table address you are trying to read ?

What is the exact exception code shown by the Modbus emulator (or that you can see by intercepting the traffic with Wireshark)...
Forum: LIVE PLC Questions And Answers Today, 01:06 PM
Replies: 17
Views: 6,229
Posted By Ken Roach
But it gives me an opportunity to read the old...

But it gives me an opportunity to read the old posts from Ron Doran, who died in December 2007, not much older then than I am now.

I hope his wife and kids are doing well. He seemed like the...
Forum: LIVE PLC Questions And Answers Today, 09:07 AM
Replies: 14
Views: 240
Posted By Ken Roach
Very probably, yes. The software can't browse...

Very probably, yes. The software can't browse for nodes that are not there.

The very first thing that a device does to "go online" with a network is send out a "duplicate MAC ID check" packet. ...
Forum: LIVE PLC Questions And Answers Today, 09:02 AM
Replies: 17
Views: 192
Posted By Ken Roach
I'm not sure you're going to find one that fits.

The only SLC-500 controller that has an 8-pin Mini-DIN connector is the SLC-5/04, and that's keyed and pinned for Data Highway Plus.

If you're trying to have a universal connector for both SLC-500...
Forum: LIVE PLC Questions And Answers Yesterday, 05:50 PM
Replies: 21
Views: 806
Posted By Ken Roach
Thank you for posting the program ! The...

Thank you for posting the program !

The system has three PowerFlex 755's configured as CIP Motion axes (Shuttle, Tension, and CAT) and four PowerFlex 755's configured as ordinary variable speed...
Forum: LIVE PLC Questions And Answers Yesterday, 05:03 PM
Replies: 8
Views: 338
Posted By Ken Roach
The signals are actually 24V DC, but safety...

The signals are actually 24V DC, but safety relays use pulse signals to check for cross-wiring faults. Channel 1 is a particular pulse speed, while Channel 2 is a different speed, and the input...
Forum: LIVE PLC Questions And Answers Yesterday, 04:22 PM
Replies: 4
Views: 158
Posted By Ken Roach
Your price point and your I/O count seem to drop...

Your price point and your I/O count seem to drop by 1/3 every week.

Unless you're building hundreds of these units, buy one that you already know how to use and has the features that you want.
...
Forum: LIVE PLC Questions And Answers Yesterday, 11:55 AM
Replies: 14
Views: 240
Posted By Ken Roach
I believe that the "DeviceNet Pass Through...

I believe that the "DeviceNet Pass Through Drivers" was removed from a handful of releases of RSLinx Classic because of some 32/64 bit driver conflicts, but that's been quite a few years ago.

The...
Forum: LIVE PLC Questions And Answers Yesterday, 10:53 AM
Replies: 2
Views: 90
Posted By Ken Roach
Welcome to the PLCTalk forum community ! ...

Welcome to the PLCTalk forum community !

This is not necessarily an easy answer, so let's fill out the details. I think you're describing a "main PLC" and two remote stations, and an engineering...
Forum: LIVE PLC Questions And Answers Yesterday, 10:48 AM
Replies: 14
Views: 240
Posted By Ken Roach
In RSLinx, you need to set up a "1747-SDNPT"...

In RSLinx, you need to set up a "1747-SDNPT" Pass-Through Driver.


This is not a "drill down" mechanism like other drivers. You designate an SLC controller and a Slot number for a 1747-SDN, and...
Forum: LIVE PLC Questions And Answers Yesterday, 09:59 AM
Replies: 13
Views: 372
Posted By Ken Roach
Is the reference coming from another drive? Any...

Is the reference coming from another drive? Any chance you're running in torque mode ?

I had a PowerFlex 70 drive give me negative torque feedback for a couple of seconds in a torque-sharing...
Forum: LIVE PLC Questions And Answers Yesterday, 09:54 AM
Replies: 3
Views: 112
Posted By Ken Roach
The SLC-500 scanner only showed you the current...

The SLC-500 scanner only showed you the current Node and Code that are scrolling across the display, so you will have to come up with some logic to put the Codes into a data table, and to zero them...
Forum: LIVE PLC Questions And Answers Yesterday, 09:52 AM
Replies: 2
Views: 74
Posted By Ken Roach
ControlLogix has no equivalent to the "local I/O...

ControlLogix has no equivalent to the "local I/O scanner" feature in PLC-5.

Your instinct is correct; put the complex modules in the chassis with the controller, and the discrete or slower...
Forum: LIVE PLC Questions And Answers Yesterday, 09:47 AM
Replies: 21
Views: 806
Posted By Ken Roach
The "running at speed" status does seem to...

The "running at speed" status does seem to conflict with the reference issue.

But I've seen dozens of instances of Stop/Start assertion conflict, and only a handful of inadvertent reference...
Forum: LIVE PLC Questions And Answers June 18th, 2019, 05:24 PM
Replies: 21
Views: 806
Posted By Ken Roach
This sounds more and more like a "missed Start...

This sounds more and more like a "missed Start bit transition" to me.

Can you ZIP and post the program itself ? Examining screenshots is unsatisfying.
Forum: LIVE PLC Questions And Answers June 18th, 2019, 12:18 PM
Replies: 21
Views: 806
Posted By Ken Roach
For a tiny instant in between the second MUL and...

For a tiny instant in between the second MUL and the ABS instruction pictured in the "Math" rung, the value of the "Calculated_Letoff_RPM" tag is negative.

Because that tag is used to calculate...
Forum: LIVE PLC Questions And Answers June 18th, 2019, 11:02 AM
Replies: 2
Views: 151
Posted By Ken Roach
Welcome to the PLCTalk forum community ! ...

Welcome to the PLCTalk forum community !

Unfortunately for your application, A-B modular I/O is designed and supported for use with A-B controllers, and they put very little effort into...
Forum: LIVE PLC Questions And Answers June 17th, 2019, 12:59 PM
Replies: 6
Views: 207
Posted By Ken Roach
What exact part number is it ? Have you...

What exact part number is it ?

Have you connected it to a network ?

Is it an output module with an auxiliary output circuit that you have not yet connected ?

Is it an input module with...
Forum: LIVE PLC Questions And Answers June 17th, 2019, 12:12 PM
Replies: 6
Views: 1,526
Posted By Ken Roach
Thanks for the details ! I think this is an...

Thanks for the details !

I think this is an element of the program you can safely remove.

The connection to the Ethernet module itself is not as relevant as the connections to all of the...
Forum: LIVE PLC Questions And Answers June 16th, 2019, 06:53 PM
Replies: 5
Views: 339
Posted By Ken Roach
Exactly correct. If your HMI allows you to...

Exactly correct.

If your HMI allows you to set a bit when the operator enters a new value, use that bit to trigger the MCD instruction. Otherwise, just compare the speed setpoint to an "old...
Forum: LIVE PLC Questions And Answers June 15th, 2019, 12:33 PM
Replies: 1
Views: 231
Posted By Ken Roach
Fault codes on these drives start with the DPI...

Fault codes on these drives start with the DPI interface number; DPI Port 13 is the PowerFlex 755 built-in EtherNet/IP port.

The common codes associated with EtherNet/IP control connections are...
Forum: LIVE PLC Questions And Answers June 14th, 2019, 04:50 PM
Replies: 5
Views: 339
Posted By Ken Roach
Hang on there, you're making some incorrect...

Hang on there, you're making some incorrect presumptions.

MCD changes the dynamics of an existing Move that is already in progress. It has accel/decl and speed values. It does not change...
Forum: LIVE PLC Questions And Answers June 14th, 2019, 04:02 PM
Replies: 5
Views: 339
Posted By Ken Roach
You are exactly correct; instruction like the...

You are exactly correct; instruction like the Motion Axis Move (MAM) and Motion Axis Jog (MAJ) use the speed that is given when the instruction is executed.

The Motion Change Dynamics (MCD) is...
Forum: LIVE PLC Questions And Answers June 14th, 2019, 02:33 PM
Replies: 10
Views: 420
Posted By Ken Roach
A MSG instruction can use the serial port of a...

A MSG instruction can use the serial port of a ControlLogix, even if that ControlLogix is not the source of the MSG.

But of course the last two generations of ControlLogix CPUs don't have...
Forum: LIVE PLC Questions And Answers June 14th, 2019, 12:37 PM
Replies: 10
Views: 420
Posted By Ken Roach
Many devices that implement DF1 start with the...

Many devices that implement DF1 start with the "Common Interface File" commands. PLC-2 controllers had a flat memory structure, instead of having different "data table types" like a PLC-5 has (In,...
Showing results 1 to 25 of 500

 
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