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Siemens Simatic S7-400 User Manual

Page 138

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Digital Modules

4-16

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Input Characteristic Curve for Digital Inputs

As long as the current flowing into the module remains

v

1.5 mA, the module

recognizes this as a “0” signal.

0.5

1.5

2

6

7

0

5

11 13 15

24

30

I

min

to IEC 61131; type 2

I

min

to IEC 61131; type 1

Typ. switching threshold

(9.5 V)

Resistance characteristic

curve

L+ (V)

– 30 V

I

E

(mA)

“0”

“1”

1

0

L+

M

I

v

1.5 mA

--> “0” signal

PLC

input resistance

2-Wire BERO

BERO

standard

I

v

1.5 mA

Figure 4-1

Input Characteristic Curve for Digital Inputs

IEC 61131, Type 1 in the Case of the Digital Input Module (6ES7421-1BL01-0AA0)

The input current in the case of the digital input module (6ES7421-1BL01-0AA0)
reaches 1.5 mA only above the +5 V switching threshold but under the switching
threshold of the module (typ. 9.5 V). Therefore only type 1 can be specified with the
IEC 61131 standard.

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