Supply voltage Load voltage L + rating (DC) 24 V permissible range, lower limit (DC) 20.4 V permissible range, upper limit (DC) 28.8 V Input current from load voltage L + (without load), max 80 mA digital outputs digital outputs 16 Number of inductive shutdown voltage limit L + (-53 V) output of the lighting load breaking capacity, maximum 5 W 48 Ω load resistance range lower limit upper limit 4 kΩ Output voltage for signal "1" minimum L + (-0.8 V ) output current for signal "1" rated 0.5 A for signal "1" permissible range of 0 to 40 ℃, max 100 max 0.6 A for signal "1" minimum load current 5 mA Switching frequency with resistive load The total current (per group) max 0.5 Hz lighting load, max Hz 10 Hz output of the inductive load horizontal installation up to 40 ℃, max 4 A up to 60 ℃, max 3 A vertical installation position up to 40 ℃, the maximum length of 2 A wire shielded wire length, maximum 1000 m unshielded wire length, maximum 600 m alarms / diagnostics / status information Alarms Diagnostic alarm No diagnostic information diagnostic Short No No No broken fuse No load voltage fuse missing any diagnostic display LED Rated load voltage PWR (green) No Insurance OK FSG (green) No Galvanic isolation digital outputs Galvanic isolation between channels, grouping 8 points between the channels and the backplane bus is; optocouplers Insulation Insulation test, using the DC 500 V connection technology requires 20-pin front plug Dimensions Width 40 mm Height 125 mm Depth 120 mm Weight Weight about 190 g Date 2014-2-8 SIMATIC S7-300, DIGITAL OUTPUT SM 322 , optically isolated, 16 DO, 24V DC, 0.5A, 20-pin, the output current sum 4A / groups (8A / module)