Re: SPDT remote controlled switch?

["D&SW" <d&sw@xxxxxxxxxxx>]

 I use two PLC modules (X10 Appliance modules or "Universal" modules?) to
control two double throw or single throw  relays. One relay switches power
ON and OFF and the other relay selects the motor or motor winding (drape
direction). Even if both relays energize,  only one motor (or motor winding)
will be powered. The problem is, you will need some logic control to
determine which direction the drapes should be energized in.

"RickH" <passport@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:55b07181-30a8-4da2-a160-e88ef160abff@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Is there a SPDT PLC switch available?  One that will absolutely
> guarantee that both "throws" cannot become energized simultaneously.
> I have drapes that have separate forward/reverse motors, currently
> there is a simple hard-wired SPDT switch on the wall for open/off/
> close, "Open" energizes the forward motor and "Close" energizes the
> reverse motor.  Obviously energizing both motors simultaneously would
> quickly destroy the motors and the drapery pulls.  So I need a PLC
> switch with a true SPDT relay and 3 programmable "positions", IOW I
> dont want to cobble togeter 2 SPST switches and risk having both
> motors get energized simultaneously due to a communication glitch.
>
> How can I convert this arrangement to PLC so I can have a remote
> controlled drape?
>