User Manual

Connecting the inputs
45
08/04 AWB2528-1423GB
Figure 18: EASY…-DC-.E
Connecting analog inputs
Inputs I7, I8, I11 and I12 can also be used to connect analog
voltages ranging from 0 V to 10 V.
The following applies:
•I7 = IA01
•I8 = IA02
• I11 = IA03
• I12 = IA04
The resolution is 10-bit = 0 to 1023.
X Use shielded twisted pair cables to prevent interference
with the analog signals.
X For short cable lengths, ground the shield at both ends
using a large contact area. If the cable length exceeds
30 m or so, grounding at both ends can result in
equalisation currents between the two grounding points
L01 +
L01 –
R10R9R8R7R6R5R4R3R2R1E+ E–
R11
R12 0V0V+24V
24 V H
F1
Caution!
Analog signals are more sensitive to interference than
digital signals. Consequently, more care must be taken
when laying and connecting the signal lines. Incorrect
switching states may occur if they are not connected
correctly.