beautypg.com

6 input characteristic curve for digital inputs – Siemens Simatic S7-400 User Manual

Page 137

background image

Digital Modules

4-15

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

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

y

2 mA already at + 5 V

In the case of type 1, an input current of

y

0.5 mA already at + 5 V

EN 60947-5-2, Two-Wire BEROs

The standard for BEROs (EN 60947-5-2) specifies that there can be a current of

v

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 two-wire BEROs. This must be in accordance with BERO requirements.

This manual is related to the following products: