SIMATIC S7-400 – SM 421 Digital Input Modules – Siemens

$ 287.66 – $ 673.03

SKU: N/A

Digital input modules can be used to connect the control to digital process signals. They are suitable for connecting standard switches and two-wire proximity switches (BERO).

Siemens Digital Input Modules SIMATIC S7-400 Product Specifications:

Article number 6ES7421-7BH01-0AB0 6ES7421-1BL01-0AA0 6ES7421-1EL00-0AA0 6ES7421-1FH20-0AA0 6ES7421-7DH00-0AB0
SM421, 16DI, DC24V, 0.05MS INPUT DELAY SM421, 32DI, DC24V SM421, 32DI, DC/AC 120V SIMATIC S7-400, DIG.INPUT MOD. SIMATIC S7-400, SM 421
Supply voltage
Load voltage L+
● Rated value (DC) 24 V
● permissible range, lower limit (DC) 20.4 V
● permissible range, upper limit (DC) 28.8 V
Input current
from supply voltage L+, max. 120 mA
from backplane bus 5 V DC, max. 130 mA 20 mA 200 mA 80 mA 150 mA
Encoder supply
Number of outputs 2
Type of output voltage L+ (-2.5 V)
Short-circuit protection Yes; Electronic
additional (redundant) feed Yes; possible
Output current
● Rated value 120 mA
● permissible range, lower limit 0 mA
● permissible range, upper limit 150 mA
Power loss
Power loss, typ. 5 W 6 W 6.5 W 12 W 8 W; 3.5 W (24 V DC); 6.5 W (48 V DC); 8.0 W (60 V DC)
Digital inputs
Number of digital inputs 16 32 32 16 16
Number of simultaneously controllable inputs
● Number of simultaneously controllable inputs 16 32 32 16 16
Input voltage
● Type of input voltage DC DC AC/DC AC/DC AC/DC
● Rated value (DC) 24 V 24 V
● Rated value (UC) 120 V; 47 … 63 Hz 230 V; 120/230 V UC (47 … 63 Hz) 24 V; 24 V UC to 60 V UC (47 … 63 Hz)
● for signal “0” -30 V DC to +5 V DC -30 V DC to +5 V DC 0 to 20 V UC 0 to 40 V AC/ -40 to +40 V DC -6 to +6 V DC/ 0 to 5 V AC
● for signal “1” 11 V DC to 30 V DC 13 V DC to 30 V DC 79 to 132 V AC; 80 to 132 V DC 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V 15 to 72 V DC; -15 to -72 V DC; 15 to 60 V AC
Input current
● for signal “0”, min. 6 mA; < 6 mA 0 mA 0 mA; AC: 0 mA; DC: 0 mA
● for signal “0”, max. (permissible quiescent current) 1.3 mA 1 mA 6 mA; AC: 6 mA; DC: 2 mA
● for signal “1”, typ. 6 mA; 6 to 8 mA 7 mA 2 mA; 2 to 5 mA 10 mA; at 120 V: 10 mA AC, 1.8 mA DC; at 230 V: 14 mA AC, 2 mA DC 4 mA; 4 to 10 mA
Input delay (for rated value of input voltage)
for standard inputs
— parameterizable Yes Yes
— Rated value 0.5 ms; 0.5 / 3 / 10 / 20 ms
— at “0” to “1”, min. 3 µs; 0.05 / 0.1 / 0.5 / 3 ms 1.2 ms 5 ms
— at “0” to “1”, max. 4.8 ms 25 ms; 10 / 20 ms 20 ms; AC: 20 ms; DC: 15 ms
— at “1” to “0”, min. 1.2 ms 5 ms
— at “1” to “0”, max. 4.8 ms 25 µs 30 ms; AC: 30 ms; DC: 25 ms
Encoder connection
● Fixed current limitation for wire-break monitoring, min. 10 kΩ 18 kΩ; 18 kohms: Rated voltage 24 V (15 to 35 V); 39 kohms: Rated voltage 48 V (30 to 60 V)
● Fixed current limitation for wire-break monitoring, max. 18 kΩ 56 kΩ; Rated voltage 60 V (50 to 72 V)
Cable length
● shielded, max. 1 000 m; 1 000 m: 3 ms, 70 m: 0.5 ms, 30 m: 0.1 ms, 30 m: 0.05 ms 1 000 m 1 000 m 1 000 m 1 000 m
● unshielded, max. 600 m; 600 m: 3 ms; 50 m: 0,5 ms; 20 m: 0,1 ms; 20 m: 0,05 ms 600 m 600 m 600 m 600 m; 600 m: 3, 10, 20 ms; 100 m: 0,5 ms
Encoder
Connectable encoders
● 2-wire sensor Yes Yes Yes Yes Yes
— permissible quiescent current (2-wire sensor), max. 3 mA 1.5 mA 1 mA 5 mA; AC: 5 mA 0.5 mA; 0.5 to 2 mA
Interrupts/diagnostics/status information
Diagnostics function Yes; Parameterizable No No Yes; Parameterizable
Alarms
● Diagnostic alarm Yes; Parameterizable Yes; Parameterizable
● Hardware interrupt Yes; Parameterizable Yes; Parameterizable
Diagnoses
● Diagnostic information readable Yes Yes; possible
● Monitoring the supply voltage Yes
● Wire-break Yes; I < 1 mA Yes; I> 0.7 mA
Diagnostics indication LED
● Rated load voltage PWR (green) Yes; Per group
● internal fault INTF (red) Yes
● external fault EXTF (red) Yes
● Status indicator digital input (green) Yes Yes Yes Yes Yes
● Channel fault indicator F (red) No No
Potential separation
Potential separation digital inputs
● between the channels Yes No Yes Yes Yes
● between the channels, in groups of 8 32 8 4 1
● between the channels and backplane bus Yes Yes Yes Yes Yes
Isolation
Isolation tested with 500 V DC 500 V DC 1 500 V AC 1 500 V AC 1 500 V AC
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. 600 g 600 g 650 g 600 g
Weight N/A
Dimensions N/A

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