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Search: Posts Made By: drbitboy
Forum: LIVE PLC Questions And Answers January 15th, 2021, 09:10 AM
Replies: 27
Views: 2,080
Posted By drbitboy
Assuming the above is correct, I modified the...

Assuming the above is correct, I modified the code to follow Rule 5 (drop one band per 15 minutes when temperature is less than 85 deg), and attach it here. It actually uses fewer instructions but...
Forum: LIVE PLC Questions And Answers January 15th, 2021, 05:30 AM
Replies: 27
Views: 2,080
Posted By drbitboy
I have a request for clarification from the OP. ...

I have a request for clarification from the OP.


Here is a restatement of the process behavior rules:


Band 1 if temperature below 85 for 15 minutes
Band 2 if temperature between 85 and 95...
Forum: LIVE PLC Questions And Answers January 14th, 2021, 09:04 AM
Replies: 27
Views: 2,080
Posted By drbitboy
Btw, I think you will end up somewhere else, but...

Btw, I think you will end up somewhere else, but there is an ugly answer to this query that will complete in one scan:



F4_15min Bits/0
---] [--+--]/[------[BSR ]---+----
| ...
Forum: LIVE PLC Questions And Answers January 13th, 2021, 06:01 PM
Replies: 27
Views: 2,080
Posted By drbitboy
[SF-1 High] and [SF-2 Low] are always Stop, [SF-1...

[SF-1 High] and [SF-2 Low] are always Stop, [SF-1 Low] is always Start, and some of the bits are always the same in all bands, so there are effectively only five bits that need to be controlled:

...
Forum: LIVE PLC Questions And Answers January 13th, 2021, 12:42 PM
Replies: 27
Views: 2,080
Posted By drbitboy
One more approach with three rungs, but only 8...

One more approach with three rungs, but only 8 instructions per Fn combination; F3, F4, and the output steps are shown in the image below.


What I like about this one is that the TON rung logic...
Forum: LIVE PLC Questions And Answers January 13th, 2021, 10:09 AM
Replies: 27
Views: 2,080
Posted By drbitboy
Sidebar: I think some of these solutions have...

Sidebar: I think some of these solutions have not picked up that the OP process description has each Fn state (combination) representing the state of all four fans, i.e. "F1" is not Fan 1 on/off...
Forum: LIVE PLC Questions And Answers January 12th, 2021, 06:51 AM
Replies: 27
Views: 2,080
Posted By drbitboy
Eight rungs ([one timer + one transition] per...

Eight rungs ([one timer + one transition] per range) to allow logic to skip, or at least shorten, the time to transition more than one combination; this is how I interpreted Lare's post #3...
Forum: LIVE PLC Questions And Answers January 11th, 2021, 07:29 PM
Replies: 27
Views: 2,080
Posted By drbitboy
Five rungs for the meat of a bi-directional SQO;...

Five rungs for the meat of a bi-directional SQO; it does not skip fan combinations.


As to an opinion on its clarity, I can only say that is like noses: everybody has one.


56864
Forum: LIVE PLC Questions And Answers January 11th, 2021, 05:50 PM
Replies: 27
Views: 2,080
Posted By drbitboy
The false-to-true transition to trigger the next...

The false-to-true transition to trigger the next pattern is not a showstopper here, the lack of bi-directional capability is, though. maybe we can write directly to .position?





Yeah, MVM...
Forum: LIVE PLC Questions And Answers January 11th, 2021, 05:01 PM
Replies: 27
Views: 2,080
Posted By drbitboy
never mind, I think SQO only goes in one...

never mind, I think SQO only goes in one direction.
Forum: LIVE PLC Questions And Answers January 11th, 2021, 03:58 PM
Replies: 27
Views: 2,080
Posted By drbitboy
update: whoops, I just realized F1-F4 are the...

update: whoops, I just realized F1-F4 are the combinations, not the individual fans.

There are five combinations, not four:


Add F1.5 which is all fans off.

three INTs: fnum; losp, hisp...
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