Lighthouse PLCs, Inc. : Automation Forum
THE PURPOSE OF THIS FORUM IS: AUTOMATION SOLUTIONS. IF YOU ARE A PERSON INVOLVED IN SOME ASPECT OF AUTOMATION, HAVE AN APPLICATION YOU JUST CAN'T QUITE GET A HANDLE ON 
- HAVE A PRODUCT QUESTION - OR MAYBE HAVE AN ISSUE WITH SOMETHING (EVEN IF IT IS WITH US 
), IT IS POSSIBLE YOU WILL FIND THE ANSWER HERE!!
OR, IF YOU ABSOLUTELY KNOW THE ANSWER, OR EVEN THINK YOU KNOW THE ANSWER, THEN JUST POST IT! MAKE THAT REPLY!
YOU ARE PROBABLY RIGHT ON THE MARK, AND MIGHT BE ABLE TO HELP SOMEBODY OUT!! 
AND, IT COULD BE YOU THAT NEEDS HELP NEXT TIME. AFTER ALL...(REALLY?).. ARE WE NOT ALL "CHILDREN" - AT VARIOUS POINTS ON THE LEARNING CURVE OF TECHNOLOGY" ??? (I know I've still got a lot to learn and I've been at it for... well since 1970!)
Hopefully the information presented here will help provide solutions to some of today's automation challenges. Some issues are probably old, some are probably new. Many are products of the economy, the resultant reduction in manpower, exacerbated by aging equipment crippled by decreases in maintenance budgets. The ULTIMATE goal here is that we all become more successful in our careers and chosen professions.
MAYBE THIS FORUM CAN HELP!!!
You know the rules - ADVERTISING IS NOT ALLOWED ! 
This area is for we, :
...the Fraternal Order of Propeller-Heads
You know the rest - no flaming 
, profanity, blatant advertising, etc., etc., blah, blah, blah. If you are 5 years old, or feel like acting 5 years old, you really need to go outside and ride your bike - OH, and seek some professional therapy. Yea, that would be good, too!
OH! BTW, if you don't feel like providing your name/company, just put "Anonymous" / "Withheld"/ "Not On File" or Anything! I promise 
we won't tell !
Note: For best viewing..
We suggest switching to "Board Style" (below) rather than "Threaded Style" !
Your choice! 
There is no user replaceable fuse inside the unit. The manufacture suggests (as all manufacturers do,) installing a fuse ahead of the PLC when installing, however.
My guess is that a voltage surge (transient voltage surge or lightning strike) may have damaged the internal circuitry.
Do not confuse the +24VDC terminals on the top of the unit, with the AC Power (85 to 264VAC) terminals on the bottom terminal strip. The unit does require (85 to 264VAC) power to operate. The +24VDC terminals are provided as a convenient way to get power to (a) the STA(start) switch, and (b) the Input devices. If you apply AC input power, you should see voltage on the +24VDC terminals (if the power supply has not been damaged.
If you would like to send us the unit, we could (at no charge) check the unit out and tell you if it has been damaged.
I hope this helps! 
