
Digital modules
4.8 Digital input module SM 421; DI 16 x DC 24 V (6ES7421-7BH01-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
113
Current consumption
From the backplane bus (5 V)
Max. 130 mA
From power supply L+
Max. 120 mA
Power loss of the module Typ. 5 W
Status, interrupts, diagnostics
Status display Green LED per channel
Interrupts
Hardware interrupt
Programmable
Diagnostic interrupt
Programmable
Diagnostic functions
Monitoring of the power supply voltage of the
electronics
Yes
Monitoring of the load voltage
Green LED per group
Group error display
for internal disruption
for external disruption
Red LED (INTF)
Red LED (EXTF)
Channel error display
None
Reading diagnostics information
Yes
Monitoring of
Wire break
I < 1 mA
Injection of substitution values Yes
Sensor supply outputs
Number of outputs 2
Output voltage
On load
Min. L + (-2.5 V)
Output current
Nominal value
120 mA
Permissible range
0 to 150 mA
Additional (redundant) supply Supported
Short-circuit protection Yes, electronic
Sensor selection data
Input voltage
Nominal value
24 VDC
For "1" signal
11 to 30 V
For "0" signal
-30 to 5 V
Input current
With "1" signal
6 to 12 mA
With "0" signal
< 6 mA
Input characteristics In accordance with IEC 61131; type 2
Connection of 2-wire BEROs
Permissible quiescent current
Supported
Max. 3 mA
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