Figure 3-2 Configuration Of The Analogue Input As A Digital Input - Siemens Micromaster 440 Operating Instructions Manual

3 Commissioning
3.1.1 Standard settings for the terminals
See Figure 3-2.
3.1.2 Analogue inputs
Analogue input 1 (AIN1) can be used with:
! 0 - 10 V, 0 - 20 mA and -10 V to +10 V
Analogue input 2 (AIN2) can be used with:
! 0 - 10 V and 0 - 20 mA
The analog input circuit can be alternatively configured to provide additional digital
inputs (DIN7 & DIN8) as shown:
Figure 3-2
When an analogue input is configured as a digital input the threshold values are as
follows:
Terminal 9 (24 V) can also be used to drive the analog inputs when used as digital
inputs. Terminals 2 and 28 (0 V) must be linked together.
44
1
2
3
DIN7
4
Configuration of the analogue input as a digital input
1.75 V DC = OFF
3.70 V DC = ON
1
2
10
DIN8
11
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
Issue 12/02