Input Characteristic Curve For Digital Inputs - Siemens SIMATIC S7-400 Reference Manual

4.6

Input characteristic curve for digital inputs

IEC 61131, type 1 and type 2
The IEC 61131 standard requires the following for the input current:
● In the case of type 2, an input current of ≥ 2 mA already at + 5 V
● In the case of type 1, an input current of ≥ 0.5 mA already at + 5 V
EN 60947-5-2, 2-wire BEROs
The standard for BEROs (EN 60947-5-2) specifies that there can be a current of ≤ 1.5 mA for
BEROs in the "0" signal state.
The input current of the module in the "0" signal state is decisive for the operation of 2-wire
BEROs. This must be in accordance with BERO requirements.
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
4.6 Input characteristic curve for digital inputs
Digital modules
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