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Showing results 1 to 25 of 500
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Search: Posts Made By: Ken Roach
Forum: LIVE PLC Questions And Answers Today, 04:55 PM
Replies: 6
Views: 51
Posted By Ken Roach
Hmm.... maybe you can't use pushbuttons for this,...

Hmm.... maybe you can't use pushbuttons for this, then. I must have misunderstood the "On in Auto" label.

The MicroLogix 1200 does have a physical Run/Prog toggle switch, so you could remove the...
Forum: LIVE PLC Questions And Answers Today, 04:24 PM
Replies: 6
Views: 51
Posted By Ken Roach
Yeah, that's a little messy. It looks like a...

Yeah, that's a little messy. It looks like a simple-enough process that you should be able to sit down with pencil and paper and write out a "discrete state machine" with each step in the...
Forum: LIVE PLC Questions And Answers Yesterday, 07:49 PM
Replies: 10
Views: 179
Posted By Ken Roach
I always connect the unused Discrete Inputs to DC...

I always connect the unused Discrete Inputs to DC common so that they stay logically FALSE and there's no possibility of them "floating" into the true voltage range.

That's different from...
Forum: LIVE PLC Questions And Answers Yesterday, 07:02 PM
Replies: 9
Views: 243
Posted By Ken Roach
The Spectrum Controls WebPort might be a good...

The Spectrum Controls WebPort might be a good choice. Not super-cheap, but their VPN service is included (instead of a monthly or per-MB charge).

When there's no on-site IT department to...
Forum: LIVE PLC Questions And Answers Yesterday, 03:55 PM
Replies: 15
Views: 333
Posted By Ken Roach
One drawback to the MicroLogix 1400 as a data...

One drawback to the MicroLogix 1400 as a data broker is that it can't natively read ControlLogix tags.

While the "no programming of the ControlLogix" may not prohibit configuration of a PCCC/Logix...
Forum: LIVE PLC Questions And Answers Yesterday, 03:00 PM
Replies: 10
Views: 179
Posted By Ken Roach
Because you're using digital inputs on this drive...

Because you're using digital inputs on this drive (you mentioned it in a previous post) be sure that you understand the configuration and function of all of them.

Also, if you have disabled any of...
Forum: LIVE PLC Questions And Answers Yesterday, 02:51 PM
Replies: 10
Views: 179
Posted By Ken Roach
Are you using only hardwired reference and...

Are you using only hardwired reference and commands, or do you also have the drive connected to a network ?

By default a PowerFlex 753 will follow Reference A. With all the Speed Select bits...
Forum: LIVE PLC Questions And Answers Yesterday, 12:23 PM
Replies: 13
Views: 177
Posted By Ken Roach
Thumbs up Everybody raise your hands if you've been fooled...

Everybody raise your hands if you've been fooled by a non-executing subroutine.

Now raise you hands if it happened this this week.
Forum: LIVE PLC Questions And Answers Yesterday, 12:14 PM
Replies: 13
Views: 177
Posted By Ken Roach
If the status LED isn't lighting up when you turn...

If the status LED isn't lighting up when you turn on an output using logic or Forcing, then the Output module is mis-configured or defective.

Take a look at the actual status of the Output module...
Forum: LIVE PLC Questions And Answers Yesterday, 11:35 AM
Replies: 13
Views: 177
Posted By Ken Roach
This is normal for discrete AC output modules

120V AC solid-state output modules use "Triac" devices, which always allow some leakage current. With no load attached, you will always measure 120V AC at the output.

You can experiment by...
Forum: LIVE PLC Questions And Answers Yesterday, 09:48 AM
Replies: 4
Views: 73
Posted By Ken Roach
Or... take a step back.... When a...

Or... take a step back....

When a ControlLogix controller encounters a corrupted user program in RAM, it intentionally erases the program in RAM. This is normal behavior but it is often referred...
Forum: LIVE PLC Questions And Answers Yesterday, 09:31 AM
Replies: 4
Views: 73
Posted By Ken Roach
Type 7 Code 41 is a failed read from the...

Type 7 Code 41 is a failed read from the removable memory card, and in the case of these older 1756-L6x controllers that's a CompactFlash card.

Failures across four different controllers strongly...
Forum: LIVE PLC Questions And Answers October 16th, 2018, 03:08 PM
Replies: 6
Views: 172
Posted By Ken Roach
Any chance that cylinder's pneumatic valve is...

Any chance that cylinder's pneumatic valve is wired to the same DC power supply as the DeviceNet network ? A brown-out or voltage spike is a classic reason for an adapter to declare the network...
Forum: LIVE PLC Questions And Answers October 16th, 2018, 02:20 PM
Replies: 15
Views: 333
Posted By Ken Roach
I'm a big fan of the HMS Anybus and Communicator...

I'm a big fan of the HMS Anybus and Communicator devices, but one of the best things about them is that they are configured easily via an Add-On Profile in Studio 5000.

In this particular...
Forum: LIVE PLC Questions And Answers October 16th, 2018, 11:22 AM
Replies: 15
Views: 333
Posted By Ken Roach
This eliminates the in-chassis Prosoft modules,...

This eliminates the in-chassis Prosoft modules, which are probably the most reliable method, and the Rockwell Modbus/TCP sample code implementation, which is the most labor-intensive.

My...
Forum: LIVE PLC Questions And Answers October 15th, 2018, 02:05 PM
Replies: 114
Views: 12,058
Posted By Ken Roach
This weekend I parked close to the shop and...

This weekend I parked close to the shop and linked up to WiFi so the car would have an opportunity to download the v9 HMI and system firmware. It did, and I scheduled it to install the update early...
Forum: LIVE PLC Questions And Answers October 15th, 2018, 01:55 PM
Replies: 6
Views: 172
Posted By Ken Roach
This is a little trickier. Then 1734-ADN can be...

This is a little trickier. Then 1734-ADN can be configured to report just the raw I/O data, or also to include some status data in its connection.

Look in your RSNetworx project and/or your...
Forum: LIVE PLC Questions And Answers October 15th, 2018, 01:05 PM
Replies: 6
Views: 172
Posted By Ken Roach
The 1734-ADN scans the PointBus backplane and...

The 1734-ADN scans the PointBus backplane and aggregates the I/O module data for exchange with a DeviceNet master. The two sides are isolated.

It's possible for a damaged I/O device or module to...
Forum: LIVE PLC Questions And Answers October 14th, 2018, 09:44 PM
Replies: 4
Views: 175
Posted By Ken Roach
Is the ControlNet in place because of dual media...

Is the ControlNet in place because of dual media or redundancy reasons ?

If not, then I agree it might be easier to just substitute an Ethernet link to the control system.

Otherwise, this is...
Forum: LIVE PLC Questions And Answers October 14th, 2018, 07:20 PM
Replies: 58
Views: 1,702
Posted By Ken Roach
Traditionally we are very hard on students who...

Traditionally we are very hard on students who post their homework questions while making little or no effort to answer them or who conceal that they are HNC class questions.

But I'll play along....
Forum: LIVE PLC Questions And Answers October 14th, 2018, 01:18 PM
Replies: 26
Views: 1,084
Posted By Ken Roach
Why ? Do you think that those will give you...

Why ? Do you think that those will give you very low purchase cost, or do you have a reason for not wanting a commercial industrial product, or do you need to connect to Linux-based software...
Forum: LIVE PLC Questions And Answers October 12th, 2018, 01:39 PM
Replies: 4
Views: 156
Posted By Ken Roach
Have you bought any small adorable pets from a...

Have you bought any small adorable pets from a curio shop in Chinatown lately ? Maybe ones with very specific feeding instructions ?

Be sure that the PanelView isn't in the I/O tree of the...
Forum: LIVE PLC Questions And Answers October 12th, 2018, 01:36 PM
Replies: 3
Views: 207
Posted By Ken Roach
In general, you want your wirelessly-connected...

In general, you want your wirelessly-connected laptop to be on the same IP subnet as the controller. The router will be acting as an ordinary wireless Access Point, not as a router to the...
Forum: LIVE PLC Questions And Answers October 11th, 2018, 12:13 PM
Replies: 6
Views: 215
Posted By Ken Roach
There's an old bug/issue with the way RSLinx...

There's an old bug/issue with the way RSLinx Classic interacts with the desktop when you're using Remote Desktop Protocol. It might be related to what's going on with your computer.

But now...
Forum: LIVE PLC Questions And Answers October 11th, 2018, 04:33 AM
Replies: 12
Views: 400
Posted By Ken Roach
Fine, whatever. I don't know the scope of the...

Fine, whatever. I don't know the scope of the machine or how well his customer wants it to work, or whether he's got an infinite time budget.
Showing results 1 to 25 of 500

 
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