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Showing results 1 to 25 of 282
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Search: Posts Made By: Mispeld
Forum: LIVE PLC Questions And Answers June 8th, 2018, 01:46 PM
Replies: 20
Views: 632
Posted By Mispeld
I have used Cutler-Hammer sensors for this...

I have used Cutler-Hammer sensors for this purpose. For example, from Allied Electronics:

ECSJ Series Current Switch CurrentWatch Current Sensors...
Forum: LIVE PLC Questions And Answers June 7th, 2018, 12:59 PM
Replies: 16
Views: 576
Posted By Mispeld
One process to consider is this: 1. Create two...

One process to consider is this:
1. Create two or three of the sequentially numbered tags in the AOI.
2. Export the AOI to the .L5X file.
3. Open the exported AOI in a text editor and find the...
Forum: LIVE PLC Questions And Answers May 31st, 2018, 02:20 PM
Replies: 14
Views: 442
Posted By Mispeld
The intention of the...

The intention of the request-from-multiple-locations construct is to have exactly one corresponding OTU: at the rung conditioned by the latch bit, which unlatches it and executes the requested...
Forum: LIVE PLC Questions And Answers May 31st, 2018, 08:18 AM
Replies: 14
Views: 442
Posted By Mispeld
Another use for this type of construct is to...

Another use for this type of construct is to "call" a rung of logic from multiple locations in a Program or L5K Task. For example:



A X
----] [--[ONS]-----(L)---


...
Forum: LIVE PLC Questions And Answers May 21st, 2018, 04:33 PM
Replies: 21
Views: 995
Posted By Mispeld
You are welcome for the help, much of it coming...

You are welcome for the help, much of it coming from the excellent material at the Control Guru web site.

Regarding the question about derivative action: you do not have to increase proportional...
Forum: LIVE PLC Questions And Answers May 21st, 2018, 01:16 PM
Replies: 2
Views: 125
Posted By Mispeld
The SC flag determines whether Smin and Smax are...

The SC flag determines whether Smin and Smax are used for set point scaling:

SC Scale Setpoint Flag

(word 0, bit 5)
Cleared when setpoint scaling values are specified.

Since the SLC is...
Forum: LIVE PLC Questions And Answers May 21st, 2018, 08:11 AM
Replies: 21
Views: 995
Posted By Mispeld
The methodology that I use is very well...

The methodology that I use is very well documented at the Control Guru web site. At a minimum, I suggest reading through all of the articles in section 2 from this table of contents:

Control Guru...
Forum: LIVE PLC Questions And Answers May 19th, 2018, 11:58 AM
Replies: 21
Views: 995
Posted By Mispeld
It turns out that the extra logic to clamp the...

It turns out that the extra logic to clamp the output at 30% provided some decent information about the process open loop response. Based on a first-order with deadtime model, I suggest some...
Forum: LIVE PLC Questions And Answers May 18th, 2018, 07:31 AM
Replies: 21
Views: 995
Posted By Mispeld
The PLC-5 (PD version) and CLX PID instructions...

The PLC-5 (PD version) and CLX PID instructions have anti-windup integral action defined as suspending increase in the integral term when the loop CV reaches max CO, and similarly for decreasing...
Forum: LIVE PLC Questions And Answers May 17th, 2018, 07:57 PM
Replies: 21
Views: 995
Posted By Mispeld
If the PID instruction unconditional in the...

If the PID instruction unconditional in the periodic task, then loop update time should be equal to the task period (0.25 sec). Changing that will affect the integral action, and is helpful when...
Forum: LIVE PLC Questions And Answers May 17th, 2018, 07:07 PM
Replies: 21
Views: 995
Posted By Mispeld
Is there a non-zero deadband setting?

Is there a non-zero deadband setting?
Forum: LIVE PLC Questions And Answers May 17th, 2018, 03:37 PM
Replies: 21
Views: 995
Posted By Mispeld
It would be more helpful to see the open-loop...

It would be more helpful to see the open-loop step response. This is the CV and PV trends with x and y axis values shown for a manual step change in the CV up until the PV settles, and then down...
Forum: LIVE PLC Questions And Answers May 11th, 2018, 02:54 PM
Replies: 4
Views: 267
Posted By Mispeld
I tried opening the .GML file on a true XP...

I tried opening the .GML file on a true XP machine with GML Commander 4.0 and received an "Unexpected File Format" error. If this program is on a 1394 vintage controller, you may need to use GML...
Forum: LIVE PLC Questions And Answers April 29th, 2018, 12:58 PM
Replies: 17
Views: 595
Posted By Mispeld
With independent gains, and the new loop update...

With independent gains, and the new loop update time specified correctly, I would actually multiply integral gain, Ki, by 10.

This is my thinking: in the PLC-5 the loop was being told update...
Forum: LIVE PLC Questions And Answers April 29th, 2018, 12:30 PM
Replies: 14
Views: 438
Posted By Mispeld
If changing the Step parameter to "ON" does not...

If changing the Step parameter to "ON" does not achieve the desired result, it must be concluded the trending package is not interacting with the archive in a way to take this display advice from the...
Forum: LIVE PLC Questions And Answers April 29th, 2018, 11:21 AM
Replies: 17
Views: 595
Posted By Mispeld
Here are a couple suggestions that may help to...

Here are a couple suggestions that may help to more quickly get similar performance between the active and test controllers:
. The loop update period/scan time inconsistency will affect integral...
Forum: LIVE PLC Questions And Answers April 27th, 2018, 08:10 AM
Replies: 11
Views: 656
Posted By Mispeld
Based on experience with the Watlow 96...

Based on experience with the Watlow 96 controllers, here are some answers to that series:

. With dual output, heat/cool PID controllers, one set of tuning constants apply to one controller output,...
Forum: LIVE PLC Questions And Answers April 26th, 2018, 03:47 PM
Replies: 13
Views: 507
Posted By Mispeld
Heat transfer will be the challenge, as pointed...

Heat transfer will be the challenge, as pointed out in earlier posts. Since the product is something that will be sliced, I am imagining a body without a lot of surface area relative to volume. So...
Forum: LIVE PLC Questions And Answers April 25th, 2018, 02:01 PM
Replies: 14
Views: 438
Posted By Mispeld
Set the step value "On" if all you want is the...

Set the step value "On" if all you want is the trend line to have a square-wave like appearance.
Forum: LIVE PLC Questions And Answers April 8th, 2018, 09:49 AM
Replies: 7
Views: 802
Posted By Mispeld
You can get some clues about what is causing cut...

You can get some clues about what is causing cut length variability by looking at a trend chart of some key process and machine measurements. To start with, I would look at the reference/ master...
Forum: LIVE PLC Questions And Answers April 7th, 2018, 02:41 PM
Replies: 15
Views: 815
Posted By Mispeld
The thread linked below discusses the piloted...

The thread linked below discusses the piloted list hack, among other options to write a value to the PLC linked to a specific Goto Display button for opening that display. But, if it is only...
Forum: LIVE PLC Questions And Answers April 5th, 2018, 07:36 AM
Replies: 4
Views: 435
Posted By Mispeld
I read this to mean: 1. With 24 VDC...

I read this to mean:

1. With 24 VDC disconnected from DO, the DI works, and
2. With 24 VDC disconnected from DI, the DO works.

My first guess is that something is shorting the 24 VDC, which...
Forum: LIVE PLC Questions And Answers April 4th, 2018, 07:58 AM
Replies: 4
Views: 435
Posted By Mispeld
Since some devices are OK and others Not OK, I...

Since some devices are OK and others Not OK, I assume the new -L61 is the same firmware/revision as the damaged -L61. Also I assume the backup program is correct.

Suggestions to check:
1. Go...
Forum: LIVE PLC Questions And Answers April 2nd, 2018, 10:47 AM
Replies: 16
Views: 952
Posted By Mispeld
+1. I have these SSR's running 24/7/365 for a...

+1. I have these SSR's running 24/7/365 for a few years with no issues.
Forum: LIVE PLC Questions And Answers March 29th, 2018, 01:58 PM
Replies: 10
Views: 572
Posted By Mispeld
Thanks, good limit to know before finding out the...

Thanks, good limit to know before finding out the hard way.
Showing results 1 to 25 of 282

 
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