Oak Bluffs, MA old classifieds archive and funnies > Funny Listings
> Not So Funny
> New plc (complete with software, cable & manuals )
New plc (complete with software, cable & manuals )
WOULD YOU LIKE TO LEARN TO PROGRAM A PLC ?
HERE IS EVERYTHING YOU WILL NEED IN ONE KIT
IF YOU ARE WONDERING WHAT A PLC IS....WELL SIMPLY PUT, IT IS A LITTLE BOX FULL OF RELAYS, CONTACTS, TIMERS, COUNTERS AND MUCH MORE. YOU USE THE 8 INPUTS TO TELL THE PLC WHATS GOING ON IN THE WORLD AROUND YOU....FOR EXAMPLE, CONNECT A PHOTO CELL TO ONE INPUT TO TELL THE PLC WHEN ITS DARK AND THEN PROGRAM THE PLC TO TURN ON LIGHTS FOR A SET AMOUNT OF TIME BEFORE TURNING THEM OFF....THE CONTROL OF THE LIGHTS IS ACCOMPLISHED USING ONE OF THE 6 OUTPUTS. I PROGRAMMED ONE INPUT TO KNOW WHEN MY GARAGE DOOR WAS OPEN, CONNECTED ANOTHER INPUT TO A MOTION DETECTOR TO TELL THE PLC WHEN THERE WAS NO MOVEMENT IN THE GARAGE. WHEN BOTH THESE INPUTS ARE TRUE (THE DOOR IS OPEN AND THERE IS NO MOVEMENT IN THE GARAGE) A TIMER IN THE PLC STARTS...AFTER 5 MINUTES ONE OF THE OUTPUTS CLOSES FOR A COUPLE OF SECONDS AND MAKES THE GARAGE DOOR CLOSE. I NEVER HAVE TO WORRY ABOUT LEAVING THE DOOR OPEN WHILE I AM AWAY.
I USE TIMERS AND COUNTERS AND OUTPUTS FROM A PLC TO CONTROL MY SPRINKLER SYSTEM TO WATER THE YARD.
I USE ONE OUTPUT TO TURN LANDSCAPE LIGHTS ON AROUND THE YARD AND THEN TURN THEM OFF AT BEDTIME. I NEVER HAVE TO WORRY ABOUT TURNING THEM ON AND OFF AGAIN.
AT CHRISTMAS WE POSITION A FLOOD LIGHT TO SHINE ON OUR DECORATED FRONT DOOR. THE WIFE WAS FOREVER FORGETTING TO TURN IT ON OR WHEN SHE DID REMEMBER TO TURN IT ON SHE WOULD FORGET TO TURN IT OFF. IT ENDED UP STAYING OFF MORE THAN ON. I NOW USE ONE OUTPUT IN THE PLC PROGRAMMED TO TURN THE LIGHT ON AT DARK AND OFF AT BEDTIME....ONE LESS THING TO REMEMBER AND IT ONLY USES UP ONE OUTPUT.
FOR THOSE OF YOU THAT KNOW NOTHING ABOUT PLCs SIMPLY PUT YOU WRITE THE PROGRAM TELLING THE PLC HOW TO CONTROL THE OUTPUTS BASED ON INPUTS OR COUNTERS AND OR TIMERS IN THE PLC. YOU CAN ERASE THE PROGRAM AND WRITE A NEW PROGRAM AS MANY TIMES AS YOU LIKE AND YOU NEVER RUN OUT OF TIMERS AND COUNTERS AND CONTACTS AND RELAYS UNLESS YOU USE UP ALL THE MEMORY AND I HAVE NEVER COME CLOSE TO DOING THAT NO MATTER HOW COMPLICATED A PROGRAM I WROTE.
