3 way switch question

jtm1881 · Mar 1, 2005

Using momentary contacts how would i create a 3 way switch that would hold the light on and off? In school we are using a psim program where we have to simulate different actions. in this step we are using 2 normally closed switches to one light.

CaseyK · Mar 1, 2005

How many switches do you plan to use at each location?

How many locations do you plan to have?

What type of PLC will you be using, Rack, Modular, Unitary, Circuit Board, or Embedded?.

What brand PLC will you be using?

What programming language will you be using, standard, RSView, IEC1113, LogicMaster, VersaPro, VersaMax, Cimplicity, basic, pascal, or Micro?

Will your momentary contacts be NO, NC, or Common?

What voltage will you be using, and will it be AC/DC?

Awaiting your reply...

93lt1 · Mar 1, 2005

kc9ih said:
What type of PLC will you be using, Rack, Modular, Unitary, Circuit Board, or Embedded?.

Nice job slipping that in....

CaseyK · Mar 1, 2005

'GBM - That works well, too!

73.....'ih

LT1

I thought so, and I didn't even mention traf.....

regards.....kc

Steve Bailey · Mar 1, 2005

It's simply a flip-flop with multiple event triggers. If you can do the basic flip flop, aka one button toggle, it's an easy extension to more than one button.

Lancie1 · Mar 3, 2005

jtm1881,

First, you got to know how a 3-Way switch works. It takes two of them to do any good at all!

Second, you have to know how they would be physically wired using "relay logic".

Third, you duplicate the hard-wired logic using PLC logic.

CaseyK · Mar 3, 2005

lancie:

Nice explanation.

After several of us replied, he edited his post. JR had a nice link to the drum switch, but deleted his post.

After review in original (edited) post, it looks like he is after a flip-flop. While not difficult, he has added a second input button. On top of this, both input buttons are N.C. momentary.

While not possible, it is not probable anyone would have something like that in the real world.

But it is a good brain exerciser.

regards.....casey

rsdoran · Mar 3, 2005

Lancie
Nice explanation but using momentary, as stated, then the light would always be on.

I dont believe that using 2 momentary N.C. contacts can be arranged to create A 3 way switch. As you can see from Lancies example he created 2-3 way switches. Technically, with a PLC, any contact input IS a 3 way switch.

Personally I think Steve described it best, its a flip flop with multiple triggers.

jrwb4gbm · Mar 3, 2005

 

    X1     X2               C125

----]/[----]/[---------------( )---|

 

    C125                    C130 

----]/[----------------------( )---|

 

    C130  C131     C133     C132

----] [----]/[--|--]/[-------( )---|

    C132        | 

----] [---------|

   C130      C132            C131

----]/[---|--] [-------------( )---|

    C131  |

----] [---|

 

   C130      C132   C131     C133

----] [---|--] [----] [--|---( )---|

          |    C133      |

          |----] [-------|

rsdoran · Mar 4, 2005

You do realize that is mostly garbage?

3 way switch question

jtm1881

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CaseyK

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93lt1

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Steve Bailey

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jrwb4gbm

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