Siemens SIMATIC S7-400 Reference Manual page 115

Input current
● For "1" signal
Input characteristic
Connection of 2-wire BEROs
● Permissible quiescent current
Internal processing time for
● hardware interrupt enable only
● Hardware and diagnostic interrupt enable
Input delay
● Configurable
● Rated value
Values included in cycle and response times.
Sensor resistor circuit for wire-break monitoring
● Rated voltage 24 V(15 to 35 V)
● Rated voltage 48 V(30 to 60 V)
● Rated voltage 60 V(50 to 72 V)
IEC 61131-2 does not specify any data for UC modules. The values were, however, adjusted as far
1
as possible to IEC 61131-2.
Minimum quiescent current is required for wire break monitoring.
2
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
4.10 Digital input module SM 421; DI 16 x UC 24/60 V (6ES7421-7DH00-0AB0)
Typ. 4 to 10 mA
as IEC 61131-2
Possible
Maximum 0.5 to 2 mA
Time, frequency
Maximum 450 µs
Maximum 2 ms
Yes
0.5 / 3 / 10 / 20 ms
Sensor circuit
18 kΩ
39 kΩ
56 kΩ
Digital modules
1)
2)
115