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Search: Posts Made By: Gerry
Forum: LIVE PLC Questions And Answers December 12th, 2016, 08:55 PM
Replies: 25
Views: 3,458
Posted By Gerry
Here in NZ you're most likely to encounter...

Here in NZ you're most likely to encounter AB/Rockwell across the major industries. Get proficient with their products and you will be employable.
Forum: LIVE PLC Questions And Answers January 5th, 2014, 10:30 PM
Replies: 5
Views: 1,161
Posted By Gerry
Use the transistor to short the DC side of a...

Use the transistor to short the DC side of a full-wave bridge rectifier. Wire the AC side of the bridge in series with the load and AC supply.
You'll want to use opto-coupling!

Of course, you...
Forum: LIVE PLC Questions And Answers January 5th, 2014, 10:27 PM
Replies: 36
Views: 7,378
Posted By Gerry
Something to be wary of is the difference in...

Something to be wary of is the difference in rotor inertia between the existing DC motors and the AC replacements. I'm not sure about general purpose motors, but with servos, like-for-like AC motor...
Forum: LIVE PLC Questions And Answers January 5th, 2014, 10:12 PM
Replies: 24
Views: 11,954
Posted By Gerry
The position error could be inside the PE...

The position error could be inside the PE tolerance and still be attempting to move - very similar to holding against gravity.
Forum: LIVE PLC Questions And Answers January 4th, 2014, 09:44 PM
Replies: 24
Views: 11,954
Posted By Gerry
Since it happens after production -- maybe the...

Since it happens after production -- maybe the servo is driven to a
"park" position that it can't actually reach, either due to obstruction or some mechanical changes that have affected position...
Forum: LIVE PLC Questions And Answers December 30th, 2013, 10:41 PM
Replies: 12
Views: 4,320
Posted By Gerry
What is the primary aim of the system? Is it to...

What is the primary aim of the system? Is it to maintain a steady flow into the tank? Or is it to maintain a steady level in the tank? You haven't indicated what is acting to reduce tank level...
Forum: LIVE PLC Questions And Answers December 2nd, 2013, 07:04 PM
Replies: 11
Views: 1,498
Posted By Gerry
Your test doesn't work because you have the...

Your test doesn't work because you have the source and reference set to the same tag. The DTR looks for differences between source and reference, filtered by the mask. The tag you're testing will...
Forum: LIVE PLC Questions And Answers June 1st, 2013, 08:11 PM
Replies: 9
Views: 2,276
Posted By Gerry
Just chiming in on your question about loop...

Just chiming in on your question about loop closure...
When you execute the MSO instruction, the loop is closed and servo action is enabled. At the same time, command position is set equal to actual...
Forum: LIVE PLC Questions And Answers July 6th, 2012, 11:20 PM
Replies: 3
Views: 1,350
Posted By Gerry
Create a UDT (xyz or whatever)with a single...

Create a UDT (xyz or whatever)with a single member ID as BOOL[64]
Create a tag Device of type xyz
Refer to the bits as Device.ID[0] to Device.ID[63]
To clear: FLL,0,Device,1
Forum: LIVE PLC Questions And Answers February 21st, 2012, 08:27 PM
Replies: 3
Views: 981
Posted By Gerry
Select the FB's properties to see the execution...

Select the FB's properties to see the execution order for the block. You can't change it directly, but you can influence it with the use of input & output "wire connectors".
Forum: LIVE PLC Questions And Answers February 21st, 2012, 08:12 PM
Replies: 10
Views: 3,363
Posted By Gerry
I think your 60 sec. cycle time is your main...

I think your 60 sec. cycle time is your main problem. It is too coarse for your system. You should reduce this as much as practical to get finer control (probably less than 5 sec). Also minimum on...
Forum: LIVE PLC Questions And Answers December 12th, 2011, 05:57 PM
Replies: 6
Views: 4,519
Posted By Gerry
If the UDT you created (as described in post #1)...

If the UDT you created (as described in post #1) covers all the data bits you require, then there is no need to bother with the tag generator tool.

The solution to the problem you were having is...
Forum: LIVE PLC Questions And Answers June 17th, 2010, 11:30 PM
Replies: 6
Views: 2,541
Posted By Gerry
If the controllers are in the same chassis - use...

If the controllers are in the same chassis - use the backplane.
Forum: LIVE PLC Questions And Answers February 7th, 2010, 07:53 PM
Replies: 11
Views: 2,555
Posted By Gerry
My 2 and an attempt to make it clear: You...

My 2 and an attempt to make it clear:

You cannot make a base tag or any part of a base tag an alias for anything else. A base tag is any tag you create as a specific type - whether DINT, Timer,...
Forum: LIVE PLC Questions And Answers April 2nd, 2009, 12:34 AM
Replies: 15
Views: 3,596
Posted By Gerry
If you create a UDT to hold the boolean array,...

If you create a UDT to hold the boolean array, then you can use a single FLL instruction to clear it.
The UDT would have a single array member, e.g. no[512]
Create a tag of the new UDT type e.g....
Forum: LIVE PLC Questions And Answers March 12th, 2009, 11:36 PM
Replies: 13
Views: 9,543
Posted By Gerry
...possibly because you don't seem to understand...

...possibly because you don't seem to understand the function.


What you describe is a shift register, not a FIFO (or queue).
Forum: LIVE PLC Questions And Answers January 5th, 2009, 12:00 AM
Replies: 6
Views: 1,537
Posted By Gerry
Position-Based State Control is a bit of a...

Position-Based State Control is a bit of a mouthful...
I call the operation described Indexing - it comes up often in motion control.
Forum: LIVE PLC Questions And Answers December 19th, 2008, 09:54 PM
Replies: 3
Views: 1,478
Posted By Gerry
Create a blank screen and force the PV to that...

Create a blank screen and force the PV to that screen using the control tags.
Forum: LIVE PLC Questions And Answers December 19th, 2008, 09:50 PM
Replies: 6
Views: 3,971
Posted By Gerry
Well, if I needed to do what the OP wants, that's...

Well, if I needed to do what the OP wants, that's how I would do it.
OP says he had to develop something in ST to do the task.
Why shag about with a complex solution when a simple one is available....
Forum: LIVE PLC Questions And Answers December 18th, 2008, 06:48 PM
Replies: 6
Views: 3,971
Posted By Gerry
Seems the S:FS first scan bit can't be used...

Seems the S:FS first scan bit can't be used directly in FBD, so use it in ladder to operate a bool tag and connect that tag to the reset input of the SETD FF (via an OR gate).
Forum: LIVE PLC Questions And Answers December 8th, 2008, 12:36 PM
Replies: 5
Views: 2,456
Posted By Gerry
Create a startup macro with as many DATALOGON...

Create a startup macro with as many DATALOGON commands as you require.
Forum: LIVE PLC Questions And Answers December 3rd, 2008, 11:33 PM
Replies: 4
Views: 1,370
Posted By Gerry
You can't expect to change the input from 3 words...

You can't expect to change the input from 3 words to 5 words and not make any changes to the scanner setup.

I suggest setting the drives up to use input assembly no. 11 which returns position as 4...
Forum: LIVE PLC Questions And Answers November 25th, 2008, 03:04 PM
Replies: 12
Views: 2,162
Posted By Gerry
The terminals are fine, but the price is...

The terminals are fine, but the price is outrageous.
The software required to program them is horrible.
Forum: LIVE PLC Questions And Answers November 11th, 2008, 03:10 PM
Replies: 6
Views: 2,218
Posted By Gerry
This could be part of the problem. OPC via...

This could be part of the problem.
OPC via RSLinx is, I believe, the recommended method.
Converting the database could take some time.
Forum: LIVE PLC Questions And Answers November 7th, 2008, 03:06 PM
Replies: 10
Views: 2,012
Posted By Gerry
...or Mad Max?

...or Mad Max?
Showing results 1 to 25 of 500

 
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