Hardware 3.2.2 Eco Control 667E 16/16 System response LEDs Serial interface (V.24) Fig. 3: Top view of Eco Control 667E 16/16 23 Power supply to outputs 16 digital outputs (underneath:red LED 152 90 667.752.00 run/stop L2-L2+ failure 24VDC D0 i g1 ita l2 O 3 u tp4 u t5 2 46 V 7 D C8 09 .1 50 A11 12 131415 com1 Digital Input 24V DC 24VDC 0 1 2 3 4 5 6 7 8 910 11121314 15 L1-L1+ 16 digital inputs (above: green LEDs) Power supply to system