Siemens DF8000 Installation Function & Configuration Commissioning Safety Regulations page 27

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+Val
1 2
Fig. 18 Group of inputs 1-4
External
power supply
+ -
+Val
16
Fig. 19 Group of inputs 5-8
A common positive voltage can be applied to pin 2 (15) with a jumper to pin 1 (16),
or from an external source. A negative voltage can be supplied to the circuits from
pins 3 and 4 (13 and 14), or from an external source. Pins 3-4 (13-14) provide the
0V reference for the inputs when using internal power, in this case jumper pins 1-2
(15-16).
Three dip-switches, located on the front panel of the DF8040 (refer to Fig. 20), are
used to set the module's I
2
from 0 to 7, the valid I C address can range from 0 to 2 (single unit) or 0 to 5 (dou-
ble unit). Refer to Annex B on page 36 for a complete list of the valid DF8000 con-
figurations.
Furthermore, 8 LEDs on the same front panel indicate the physical state of the in-
dividual inputs: the LED is ON when the input circuit is closed. These devices can
be disabled from the CPU module to reduce power requirements (see 4.1 and
10.4).
The input signals can be implemented by either normally open or normally closed
contacts. Open collector signals are also accepted, if they are referred to a com-
mon power supply return (pins 3-4 and 13-14).
Input 1 2
-Val
3 4 5 6
Example with internal power supply
Input 5
-Val
15 14 13 12
Example with external power supply
2
C address. Although there are 8 possible selections,
048_DMS_DF8000_ICC_MP4.15_A6V10081388_c_en.doc
3 4
7 8
6 7 8
11 10 9
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