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Search: Posts Made By: Mispeld
Forum: LIVE PLC Questions And Answers Today, 09:02 AM
Replies: 4
Views: 198
Posted By Mispeld
Writing in regards to 1756 analog modules, there...

Writing in regards to 1756 analog modules, there are status integers corresponding to the individual boolean tags for each channel (as if the booleans were "aliases" to the bits in the integer tags)....
Forum: LIVE PLC Questions And Answers July 21st, 2020, 11:43 AM
Replies: 8
Views: 461
Posted By Mispeld
The ControlLogix (and PLC-5) PID instructions...

The ControlLogix (and PLC-5) PID instructions convert your PV and SP to percent of full scale before computing error. So the proportional gain is considered percent-to-percent in calculating output...
Forum: LIVE PLC Questions And Answers June 28th, 2020, 04:37 PM
Replies: 6
Views: 735
Posted By Mispeld
STOD will stop converting when it encounters a...

STOD will stop converting when it encounters a non-digit in the string (other than a leading '-'). If you need to be writing an 'A' character to the RFID, it sounds like incoming and outgoing data...
Forum: LIVE PLC Questions And Answers June 21st, 2020, 10:07 AM
Replies: 7
Views: 755
Posted By Mispeld
The PIDE instruction might not have this issue...

The PIDE instruction might not have this issue related to creating a bumpless output on transition to auto because it is based on the "velocity" form of the PID computation which is inherently...
Forum: LIVE PLC Questions And Answers June 19th, 2020, 07:39 PM
Replies: 7
Views: 755
Posted By Mispeld
I'm not 100% I understand the issue, but the...

I'm not 100% I understand the issue, but the scenario described raises an interesting point regarding the transition out of software manual (SWM). The behavior described in the documentation is to...
Forum: LIVE PLC Questions And Answers June 14th, 2020, 11:16 AM
Replies: 58
Views: 3,522
Posted By Mispeld
Here's a previous time this problem was solved: ...

Here's a previous time this problem was solved:
http://www.plctalk.net/qanda/showthread.php?t=121712

Probably not the last.
Forum: LIVE PLC Questions And Answers June 10th, 2020, 03:09 PM
Replies: 16
Views: 1,040
Posted By Mispeld
Unfortunately the Rockwell boolean array is...

Unfortunately the Rockwell boolean array is limited in which instructions take it as source and destination operands. There is a well-documented work-around to embed the boolean array in a user...
Forum: LIVE PLC Questions And Answers May 15th, 2020, 08:11 AM
Replies: 14
Views: 1,622
Posted By Mispeld
I will add that another difference between these...

I will add that another difference between these methods is that the Clock Update Tool needs to run in a logged-in user session on a networked PC, whereas the Clock Sync Service can run on a...
Forum: LIVE PLC Questions And Answers May 1st, 2020, 11:11 AM
Replies: 2
Views: 410
Posted By Mispeld
http://www.plctalk.net/qanda/showthread.php?t=1244...

http://www.plctalk.net/qanda/showthread.php?t=124429
Forum: LIVE PLC Questions And Answers April 29th, 2020, 09:53 AM
Replies: 10
Views: 824
Posted By Mispeld
I have run into this before, which is covered in...

I have run into this before, which is covered in Tech Connect articles such as:

Rockwell Software install failing at Microsoft Visual C++ 2015 Redistributable...
Forum: LIVE PLC Questions And Answers April 28th, 2020, 10:39 AM
Replies: 10
Views: 902
Posted By Mispeld
+1, a real diamond-in-the-rough piece of advice.

+1, a real diamond-in-the-rough piece of advice.
Forum: LIVE PLC Questions And Answers April 27th, 2020, 12:48 PM
Replies: 36
Views: 2,507
Posted By Mispeld
For the forward model, which is the PV vs CO data...

For the forward model, which is the PV vs CO data (eyeball estimate from post #5):

PV = CO * A * B^(CO - 1)

where:
PV is process variable flow in m3/min
CO is offset fractional controller...
Forum: LIVE PLC Questions And Answers April 27th, 2020, 12:05 AM
Replies: 36
Views: 2,507
Posted By Mispeld
An effective method to improve PID control...

An effective method to improve PID control performance with a non-linear final control element, such as a valve, is to manipulate the PID output before sending it to the valve. The objective is to...
Forum: LIVE PLC Questions And Answers April 24th, 2020, 09:39 AM
Replies: 1
Views: 287
Posted By Mispeld
Rockwell lists RS-Linx Classic 2.57 as...

Rockwell lists RS-Linx Classic 2.57 as incompatible with all versions of Windows 10.

Not that it will necessarily fail, just that you might consider upgrading to a fully supported version as a...
Forum: LIVE PLC Questions And Answers April 24th, 2020, 09:34 AM
Replies: 29
Views: 1,925
Posted By Mispeld
I have wondered the same question, having been...

I have wondered the same question, having been taught that grounding both ends of a shield is worse than leaving both floating.

Also, I learned the hard way that some "industrial," shielded cable...
Forum: LIVE PLC Questions And Answers April 22nd, 2020, 11:01 AM
Replies: 29
Views: 1,590
Posted By Mispeld
LITERATURE LIBRARY...

LITERATURE LIBRARY (https://www.rockwellautomation.com/en_NA/literature-library/overview.page)

For example, if one is looking for a "bible" of sorts:

Logix 5000 Controllers General Instructions...
Forum: LIVE PLC Questions And Answers April 14th, 2020, 07:35 PM
Replies: 7
Views: 854
Posted By Mispeld
I recently set up a few laptops with multiple...

I recently set up a few laptops with multiple versions of RS-Logix and Studio 5000. On one of these I just ran Control Flash (V 15.01.00) and checked the inventory. Among the versions available for...
Forum: LIVE PLC Questions And Answers April 8th, 2020, 11:44 AM
Replies: 1
Views: 298
Posted By Mispeld
If this is a Rockwell-based device receiving the...

If this is a Rockwell-based device receiving the barcode, then, yes, it is possible to directly replace a character into the .DATA array element (i.e., [22]) of the STRING tag after the barcode is...
Forum: LIVE PLC Questions And Answers April 7th, 2020, 05:05 PM
Replies: 66
Views: 3,737
Posted By Mispeld
If always 70 to 99, length set to 30 and use...

If always 70 to 99, length set to 30 and use [x.POS + 70] as the index.
Forum: LIVE PLC Questions And Answers April 1st, 2020, 09:35 AM
Replies: 4
Views: 611
Posted By Mispeld
When you run the OPC test client, are you...

When you run the OPC test client, are you connecting to the FT Gateway OPC server, or RS-Linx (i.e., licensed OEM or Pro)? The comment about browsing with RSWho implies RS-Linx classic is involved....
Forum: LIVE PLC Questions And Answers March 17th, 2020, 08:16 AM
Replies: 37
Views: 3,139
Posted By Mispeld
The command copy specifies element 5 as the...

The command copy specifies element 5 as the starting location (i.e., Data[4]), when it should probably be Data[0].
Forum: LIVE PLC Questions And Answers March 13th, 2020, 04:40 PM
Replies: 17
Views: 1,448
Posted By Mispeld
:hmmm:

:hmmm:
Forum: LIVE PLC Questions And Answers March 13th, 2020, 12:25 PM
Replies: 17
Views: 1,448
Posted By Mispeld
Too bad you can't get a referral bonus. ...

Too bad you can't get a referral bonus. :beerchug:
Forum: LIVE PLC Questions And Answers February 27th, 2020, 09:29 AM
Replies: 37
Views: 3,139
Posted By Mispeld
Based on the screen shot of your communication...

Based on the screen shot of your communication software, it appears that the device uses the <ETX> "end-of-text" character (ASCII 03) as the message termination delimiter. In order to deal with a...
Forum: LIVE PLC Questions And Answers February 26th, 2020, 08:09 AM
Replies: 37
Views: 3,139
Posted By Mispeld
A good place to start is here: POINT I/O...

A good place to start is here:

POINT I/O ASCII
Modules 1734-232ASC, 1734-485ASC
(https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1734-um009_-en-p.pdf)
Showing results 1 to 25 of 500

 
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