Digital Modules
4-75
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Technical Specifications of the SM 422; DO 32 24 VDC/0.5 A
Dimensions and Weight
Dimensions W H D
(in millimeters)
25 290 210
Weight Approx. 600 g
Data for Specific Module
Number of outputs 32
Length of cable
• Unshielded
• Shielded
600 m
1000 m
Voltages, Currents, Potentials
Power rated voltage of the
electronics L+
24 VDC
Rated load voltage L+ 24 VDC
Total current of the outputs (per
group)
Up to 40 C
Up to 60 C
Max. 4 A
Max. 2 A
Isolation
• Between channels and
backplane bus
Yes
• Between the channels
In groups of
Yes
8
Permitted potential difference
• Between the different
circuits
75 VDC, 60 VAC
Insulation tested with
• Channels against
backplane bus and load
voltage L+
500 VDC
• Between the outputs of the
different groups
500 VDC
Current consumption
• From the backplane bus
• Power supply and load
voltage L+ (no load)
Max. 200 mA
Max. 120 mA
Power dissipation of the
module
Typ. 8 W
Status, Interrupts, Diagnostics
Status display Green LED per
channel
Interrupts
• Diagnostic Interrupt
• Hardware interrupt
Parameters can be
assigned
Parameters can be
assigned
Diagnostic functions
• Monitoring of the load
voltage
Yes
• Group error display
– For internal fault Red LED (INTF)
– For external fault Red LED (EXTF)
• Diagnostic information
readable
Yes
Monitoring for
• Short circuit > 1 A (typ.)
• Wire break < 0.15 mA
Substitute value can be applied Yes
Data for Selecting an Actuator
Output voltage
• At signal “1” Min. L + (– 0.8 V)
Output current
• At signal “1”
Rated value
Permitted range
0.5 A
5 mA to 0.6 A
• At signal “0” (leakage
current)
Max. 0.5 mA
Load resistor range 48 to 4 k
Parallel connection of 2
outputs
• For redundant triggering of
a load
Possible (only outputs
of the same group)
• To increase performance Possible (only outputs
of the same group)
Triggering a digital input Possible
Switch rate
• For resistive load Max. 100 Hz
• For inductive load
to IEC 947-5-1, DC 13
Max. 2 Hz
• For lamp load Max. 2 Hz
Limit (internal) of the inductive
circuit interruption voltage up to
Typ. L + (– 45 V)
Short-circuit protection of the
output
• Threshold on
Electronically cyclic
Typ. 0.75 A to 1.5 A
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