Digital output modules can be used to output digital signals from the control to the process. They are suitable, for example, for connecting solenoid valves, contactors, low-power motors, lamps and motor starters.

Siemens Digital Output Modules SIMATIC S7-400 Product Specifications:

Article number	6ES7422-1FH00-0AA0	6ES7422-1HH00-0AA0	6ES7422-1BH11-0AA0	6ES7422-1BL00-0AA0	6ES7422-7BL00-0AB0
	SM422, 16DO, AC120/230V, 2A	SM422, 16DO, AC5-230V, 5A RELAY	SM422, 16DO, DC24V, 2A,	SIMATIC S7-400, SM 422	SIMATIC S7-400, DIG.OUTPUT MOD.
Supply voltage
Load voltage L+
● Rated value (DC)		60 V	24 V	24 V	24 V
● permissible range, lower limit (DC)		1 V	20.4 V	20.4 V	20.4 V
● permissible range, upper limit (DC)		60 V	28.8 V	28.8 V	28.8 V
Load voltage L1
● Rated value (AC)	230 V; 120/230 V AC	230 V
● permissible range, lower limit (AC)	79 V	2 V
● permissible range, upper limit (AC)	264 V	264 V
● permissible frequency range, lower limit	47 Hz
● permissible frequency range, upper limit	63 Hz
Input current
from load voltage L+ (without load), max.	1.5 mA		30 mA	30 mA	120 mA
from backplane bus 5 V DC, max.	400 mA	1 A	160 mA	200 mA	200 mA
Power loss
Power loss, typ.	16 W	4.5 W	5 W	4 W	8 W
Digital outputs
Number of digital outputs	16	16; Relays	16	32	32
Short-circuit protection	Yes; Fuse 8 A, 250 V; per group	No	Yes; Clocked electronically	Yes; Clocked electronically	Yes; Clocked electronically
● Response threshold, typ.			2.8 to 6 A	0.7 to 1.5 A	0.75 to 1.5 A
● required current for fuse shutdown, min.	100 A
● Response time, max.	100 ms
Limitation of inductive shutdown voltage to			-30 V	-27 V	L+ (-45 V)
Controlling a digital input	Yes; possible	Yes; possible	Yes; possible	Yes; possible	Yes; possible
Size of motor starters according to NEMA, max.	Size 5 according to NEMA	Size 5 according to NEMA
Spare fuses	Fuse 8 A, 250 V, quick response
Zero-crossing switch	No
Switching capacity of the outputs
● on lamp load, max.	50 W	60 W	10 W	5 W	5 W
Load resistance range
● lower limit			24 Ω	48 Ω	48 Ω
● upper limit			4 kΩ	4 kΩ	4 kΩ
Output voltage
● for signal “1”, min.	L1 (-18.1 V)		L+ (-0.5 V)	L+ (-0.3 V)	L+ (-0.8 V)
● for signal “1” (at max. current), min.	L1 (-1.3 Vrms)
● for signal “1” (at min. current), min.	L1 (-18.1 Vrms)
Output current
● for signal “1” rated value	2 A	5 A	2 A	0.5 A	0.5 A
● for signal “1” permissible range, min.	10 mA		5 mA	5 mA	5 mA
● for signal “1” permissible range, max.	2 A		2.4 A	0.6 A	600 A
● for signal “1” permissible surge current, max.	50 A; per cycle
● for signal “0” residual current, max.	2.6 mA		0.5 mA	0.3 mA	0.5 mA
Output delay with resistive load
● “0” to “1”, max.	1 ms		1 ms	1 ms
● “1” to “0”, max.	1 AC cycle		1 ms	1 ms
Parallel switching of two outputs
● for uprating		No; Not possible	No; Not possible	Yes; possible (only outputs of the same group)	Yes; possible (only outputs of the same group)
● for redundant control of a load	Yes; Possible (only outputs with the same load voltage)	Yes; Possible (only outputs with the same load voltage)	Yes; possible (only outputs of the same group)	Yes; possible (only outputs of the same group)	Yes; possible (only outputs of the same group)
Switching frequency
● with resistive load, max.	10 Hz	10 Hz	100 Hz	100 Hz	100 Hz
● with inductive load, max.	0.5 Hz		0.1 Hz	0.5 Hz	2 Hz
● with inductive load (acc. to IEC 60947-5-1, DC13), max.			0.2 Hz; 0.2 Hz at 1 A; 0.1 Hz at 2 A	2 Hz; 2 Hz at 0.3 A; 0.5 Hz at 0.5 A	2 Hz
● with inductive load (acc. to IEC 60947-5-1, AC15), max.	0.5 Hz
● With inductive load (to IEC 60947-5-1, DC13/AC15), max.		1 Hz
● on lamp load, max.	1 Hz	1 Hz	10 Hz	10 Hz	2 Hz
● mechanical, max.		20 Hz
Total current of the outputs (per group)
all mounting positions
— up to 40 °C, max.	4 A; 6 A with fan assembly	10 A; 10 A with fan subassembly	3 A	4 A	4 A
— up to 60 °C, max.	2 A; 5 A with fan subassembly; per 4 adjacent outputs	5 A; 10 A with fan subassembly	2 A; 2 adjacent outputs each	2 A; 8 adjacent outputs each	2 A
Relay outputs
● Number of operating cycles, max.		100 000; 100 000 (AC-15 / DC-13); 3 000 000 mechanical
Switching capacity of contacts
— with inductive load, max.		5 A; 5 A (30 V DC), 5 A (230 V AC)
— with resistive load, max.		5 A; 5 A (30 V DC), 5 A (230 V AC), 1.2 A (60 V DC), 0.2 A (125 V DC)
— Thermal continuous current, max.		5 A
Cable length
● shielded, max.	1 000 m	1 000 m	1 000 m	1 000 m	1 000 m
● unshielded, max.	600 m	600 m	600 m	600 m	600 m
Interrupts/diagnostics/status information
Diagnostics function	Not parameterizable	No	No	No	Yes; Parameterizable
Alarms
● Diagnostic alarm					Yes; Parameterizable
● Hardware interrupt					Yes; Parameterizable
Diagnoses
● Diagnostic information readable					Yes
● Wire-break					Yes; <0.15 mA
● Short-circuit					Yes; > 1 A (typ.)
Diagnostics indication LED
● internal fault INTF (red)	Yes; Fuse blown				Yes
● external fault EXTF (red)	Yes; Missing load voltage				Yes
● Status indicator digital output (green)					Yes
Potential separation
Potential separation digital outputs
● between the channels	Yes	Yes	Yes	No	Yes
● between the channels, in groups of	4	2	8	32	8
● between the channels and backplane bus	Yes	Yes	Yes	Yes	Yes
Isolation
Isolation tested with	1 500 V AC	1 500 V AC	500 V DC	500 V DC	500 V DC
Dimensions
Width	25 mm	25 mm	25 mm	25 mm	25 mm
Height	290 mm	290 mm	290 mm	290 mm	290 mm
Depth	210 mm	210 mm	210 mm	210 mm	210 mm
Weights
Weight, approx.	800 g	700 g	600 g	600 g	600 g