The BOX DIN module changes the EFESTO4 / KEEPER static outputs into relays output. The BOX DIN doesn't contain an internal circuit to check the relays state, so, only EFESTO4 / KEEPER barriers with EDM (External Device Monitor) can be connected to this module. In any other application, an external circuit must check the status of the relays in order to reach the desired safety level. The MUTING lamp input changes the static input into ON / OFF output ( with 1 second interval ) on the NO relay contact. The BOX DIN outputs are two safety contacts potential free independent between them and a NC potential free.