of the LED signal lights flash. Once the photocells are running
correctly again, the control unit is ready for normal operation.
This ensures monitoring against failures, in compliance with EN
954-1, Category 2.
Control input test:
On each low voltage control input, the control unit uses a LED
signal to make the status readily known.
Operating logic: when a LED is on it means the input is closed,
when a LED is off it means the input is open.
Rev. 1.0 dated 22-04-2014
