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Siemens 6ES7421-7BH01-0AB0

SIMATIC S7-400, digital input SM 421, isolated 16 DI; 24 V DC with 0.05 ms input delay alarm, diagnostics

SiemensMFR # 6ES7421-7BH01-0AB0SKU # CEY-937FC77F47F4

Rated value (DC)24 V

permissible range, lower limit (DC)20.4 V

permissible range, upper limit (DC)28.8 V

Reverse polarity protectionYes

from supply voltage L+, max.120 mA

from backplane bus 5 V DC, max.130 mA

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About This Product

SIMATIC S7-400, digital input SM 421, isolated 16 DI; 24 V DC with 0.05 ms input delay alarm, diagnostics

Siemens 6ES7421-7BH01-0AB0

Genuine, certified Siemens product
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Product selection and compatibility support from our technical team
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Specifications

Load voltage L+

Rated value (DC)24 V

permissible range, lower limit (DC)20.4 V

permissible range, upper limit (DC)28.8 V

Reverse polarity protectionYes

Input current

from supply voltage L+, max.120 mA

from backplane bus 5 V DC, max.130 mA

Encoder supply

Number of outputs2

Type of output voltageL+ (-2.5 V)

Short-circuit protectionYes; Electronic

additional (redundant) feedYes; possible

Output current

Rated value120 mA

permissible range, lower limit0 mA

permissible range, upper limit150 mA

Power loss

Power loss, typ.5 W

Digital inputs

Number of digital inputs16

Input characteristic according to IEC 61131Type 2

Number of simultaneously controllable inputs

Number of simultaneously controllable inputs16

Input voltage

Type of input voltageDC

Rated value (DC)24 V

for signal "0"-30 V DC to +5 V DC

for signal "1"11 V DC to 30 V DC

Input current

for signal "0", min.6 mA; < 6 mA

for signal "1", typ.6 mA; 6 to 8 mA

Input delay (for rated value of input voltage)

Input frequency (with a time delay of 0.1 ms), max.2 kHz

for standard inputs

— parameterizableYes

— at "0" to "1", min.3 µs; 0.05 / 0.1 / 0.5 / 3 ms

Encoder connection

Fixed current limitation for wire-break monitoring, min.10 kΩ

Fixed current limitation for wire-break monitoring, max.18 kΩ

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

unshielded, max.600 m; 600 m: 3 ms; 50 m: 0,5 ms; 20 m: 0,1 ms; 20 m: 0,05 ms

Connectable encoders

2-wire sensorYes

— permissible quiescent current (2-wire sensor), max.3 mA

Interrupts/diagnostics/status information

Diagnostics functionYes; Parameterizable

Alarms

Diagnostic alarmYes; Parameterizable

Hardware interruptYes; Parameterizable

Diagnoses

Diagnostic information readableYes

Monitoring the supply voltageYes

Wire breakYes; I < 1 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

Channel fault indicator F (red)No

Potential separation digital inputs

between the channelsYes

between the channels, in groups of8

between the channels and backplane busYes

Isolation

Isolation tested with500 V DC

Dimensions

Width25 mm

Height290 mm

Depth210 mm

Weights

Weight, approx.600 g

Accessories 1

Genuine accessories that can be used with the Siemens 6ES7421-7BH01-0AB0 motor and are supplied separately are listed below. Click a code to open the accessory page and see the other compatible motors.