EICS
Member
back in 1994 i used an old shoebox style SLC500 to automate 3 roller shutter windows at my then home.
it had a day light sensor, thermostat set at 27 Degree C and auto/man switch with local raise lower switches at each shutter. I made the shutters come down at dusk and raise at dawn + corrected time delay (this processor did not have a RTC) throughout the year to raise at the desired time depending on sunrise time. as I'm in Australia the summers are hot so I lowered the shutters 75% closed to shade the rooms without them being dark.
it is installed in the roof cavity with no cooling and rode through many 42degree C days in the land of Oz.
its still running to my knowledge 24 years later as i left my business card in the controller and have never had a call.
the last robust Allen Bradley (not Rockwell) PLC range as well as that Gem called PLC5 !
it had a day light sensor, thermostat set at 27 Degree C and auto/man switch with local raise lower switches at each shutter. I made the shutters come down at dusk and raise at dawn + corrected time delay (this processor did not have a RTC) throughout the year to raise at the desired time depending on sunrise time. as I'm in Australia the summers are hot so I lowered the shutters 75% closed to shade the rooms without them being dark.
it is installed in the roof cavity with no cooling and rode through many 42degree C days in the land of Oz.
its still running to my knowledge 24 years later as i left my business card in the controller and have never had a call.
the last robust Allen Bradley (not Rockwell) PLC range as well as that Gem called PLC5 !
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