PLC logic

patelaksh30 · Sep 7, 2018

Hello Everyone,

Can anyone please help me to accomplish this issue in Rslogix.

Input- 1 Momentary push button
Output - 1 light

1) When we press push-button light comes on and we took off a finger from a push button and light stays on.

2) When we again press that same push button, the light goes off and when we take off a finger from a push button it stays off.

3) Again when we press a push button, the light comes on and when we take off a finger, a light goes off.

you can use any instructions.

Regards,
patelaksh30

mhammer214 · Sep 7, 2018

Homework?

Mispeld · Sep 7, 2018

Searching for the term "flip flop" will provide some clues.

patelaksh30 · Sep 7, 2018

They asked me during the interview and I could not figure it out.

Ron Beaufort · Sep 7, 2018

this is more than you really wanted to know - but here's the answer ...

http://www.plctalk.net/qanda/showthread.php?p=427567&postcount=1

more importantly, this can teach you how to think through the processor's logic scan-by-scan ...

Firejo · Sep 9, 2018

If knowing how to do that is part of a job requirement and you can't answer the question either they need to understand that you need more education or the job isn't for you (no offence).

ganutenator · Sep 9, 2018

I am confused about part 3?

ganutenator · Sep 9, 2018

Code:

If s:1/15 then
  counter:=0;
end_if

If (plc_type = slc) and s:1/15 then
  Input1.en:= false;
end_if; (*now i'm just getting ****y*)

If RE Input1 and (counter < 2) Then
  Output1:= Not Output1;
  inc(counter);
End_if;

If (counter >= 2) then
  Output1:= Input1;
end_if;

(*some jobs you may not necessarily want.*)

ganutenator · Sep 9, 2018

I'd hire you just on your ability to say "I don't know".
You'd be surprised, that is a hard commodity to find.

Chris Taylor · Sep 10, 2018

ganutenator said:
I'd hire you just on your ability to say "I don't know".
You'd be surprised, that is a hard commodity to find.

So ture, a valuable asset.

Greg7683 · Sep 10, 2018

I don't understand are u supposed to pick a number if so I pick 3 I am just confused with them ?.

sczot · Sep 11, 2018

Greg7683 said:
I don't understand are u supposed to pick a number if so I pick 3 I am just confused with them ?.

it is a sequence

also one of solutions for mitsu

James Mcquade · Sep 11, 2018

it's a sequence is true, but how would you know when to reset the sequence?
james

Greg7683 · Sep 11, 2018

I really wish I could understand what you guys are talking about.

geniusintraining · Sep 11, 2018

sczot said:
it is a sequence

also one of solutions for mitsu

sczot, what is the value of the reset for the counter ?

patelaksh30, 1 and 2 are just a normal flip flop but you need to get a little creative with 3 so try using a counter and the equal of the counter

PLC logic

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