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Installation
MN05013005E
60
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 equalization
currents between the two grounding points and thus in the
interference of analog signals. In this case, only ground the
cable at one end.
X
Do not lay signal lines parallel to power cables.
X
Connect inductive loads to be switched via the EZD outputs
to a separate power feed, or use a suppressor circuit for
motors and valves. If loads such as motors, solenoid valves
or contactors are operated with EZD via the same power
feed, switching may give rise to interference on the analog
input signals.
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.
