Programming a Momentary Pushbutton?
- Thread starter Hampton
- Start date
TConnolly
Lifetime Supporting Member
Search the forum for flip flop and toggle. There are hundreds of threads covering how to do this, from generic applications to PLC specific applications.
tragically1969
Member
Hampton said:
Easy if you use Mitsubishi:
---|M0|--------------(ALT Y0)---
Cant get cleaner than that !!
James Mcquade
Member
you can also use a counter to obtain the desired results.
i have programmed numerous pieces of equipment using this method.
regards,
james
i have programmed numerous pieces of equipment using this method.
regards,
james
geniusintraining
Lifetime Supporting Member + Moderator
http://www.plctalk.net/qanda/showthread.php?t=22175&highlight=flip+flop+toggleAlaric said:
Your answer is here... you just need to make up your mind on the best one
http://www.plctalk.net/qanda/showthread.php?t=22175&highlight=flip+flop+toggle
logicinn
Member
simple way
Button.........bit 1...........bit 1
-[ ]-----------[/]-------------( )--
................................|
................................|
Button.........bit 1........|
-[/]-----------[ ]-------
{next rung}
Button.............Button
-[ ]-----------------(R)-
bit 1 - is the bit you use for the operation
button - is the push button (I/O or HMI)
Very simple and effctive
Button.........bit 1...........bit 1
-[ ]-----------[/]-------------( )--
................................|
................................|
Button.........bit 1........|
-[/]-----------[ ]-------
{next rung}
Button.............Button
-[ ]-----------------(R)-
bit 1 - is the bit you use for the operation
button - is the push button (I/O or HMI)
Very simple and effctive
Last edited:
SMOKE
Member
That would work fine. I doesn't need to be a falling one-shot, I would make it a rising one so the output will turn on when you push the button, not when you release it.
The osr works like an anti-tie down. You must release the button to get it to one-shot again.
The osr works like an anti-tie down. You must release the button to get it to one-shot again.
OkiePC
Lifetime Supporting Member
Dirt's example may not work without a slight modification. When the output is Set in the first branch, will the 2nd branch evaluate true? I am not familiar with the PLC he is using to know for sure, but in an AB processor it will, and will Reset again.
In A/B processors, I use the same basic logic he posted with one shot rising and the addition of a memory bit:
Is is not as clean as the XOR method but easy to understand...
In A/B processors, I use the same basic logic he posted with one shot rising and the addition of a memory bit:
pb b3/99 O:0/0 O:0/0 |
-[ ]-------[osr]-----+-[/]--------+------(otl)-+
| | |
| | b3/98 |
| +------( )---+
| |
|b3/98 O:0/0 O:0/0 |
+-[/]------[ ]------(otu)-+
Is is not as clean as the XOR method but easy to understand...
Last edited:
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