Latch a Bit then Bit Shift Left

jthornton

Member
Join Date
Jul 2002
Location
Poplar Bluff, MO
Posts
295
Ok after reading the help file it says that if you latch a bit u must unlatch it with an OTU instruction...

What I am doing is to turn on a bit (latch it) if the trigger is present then the next scan do a bit shift then latch etc. All seems to work well when the bit shift fires the original bit B10:0/0 unlatches itself which is what I want to happen and the next bit B10:0/1 is now a one ala the bit shift left.

"In the event of a power loss, any OTL controlled output device will energize with the return of power if the OTL bit was set when power was lost." I'm doing a FLL on the Bits for the Bit Shift Left on the first scan so it should take care of this I hope... gotta go and test this...

Am I missing anything here???

Will it explode in my face someday???

It works in testing...

 
[trigger]--[ons]---(BSL B10:0)
[trigger]----------(L B10:0/0)



AB SLC 5/03
 
That should work fine. Since B10:0/0 is set by the latch, during a power loss it would be ON at powerup (if it WAS on before power went out), but you FILL will clear it out.

beerchug

-Eric
 

Similar Topics

Hi guys, I have a question regarding studio 5000 with processor 1769-L33ER V33.011 and Factorytalk View SE V12. I have an home-made pop-up...
Replies
3
Views
1,534
I have a program that goes like this contact latches a coil and unlatches itself b1 --l l----------(l)c1 (u)b1 then C1 does...
Replies
4
Views
1,613
Hi All In A CLX PLC is this code Ok to Unlatch a manually toggled bit after the required task is done. --I...
Replies
3
Views
1,470
Hello everyone, I have two questions that confuse me. 1. In the ladder logic, I found some switches that cannot toggle bit when the program is...
Replies
19
Views
30,697
Can i do this? I want to keep B3:6/3 false as long as B3:2/4 is true.
Replies
9
Views
2,999
Back
Top Bottom