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C7 Analog Input/Output
6.2
Connecting Loads/Actuators to the Analog Output
Overview
Cables for Analog
Signals
Isolated Analog
Output
Abbreviations and
6
Mnemonics
6-6
You can provide loads/actuators with current or voltage using the analog
output.
To reduce electrical interference, you should use twisted-pair shielded cables
for the analog signals. The shield of the analog signal cables should be
grounded at both cable ends. If there are potential differences between the
cable ends, an equipotential bonding current can flow over the shield. This
can interfere with the analog signals. In such a case, you should ground the
shield at one end of the cable only.
The analog output is isolated and so there is no electrical connection between
the reference point of the AO-M analog circuit and the M terminal of the C7.
A potential difference V
can occur between the reference point of the
ISO
analog circuit M
and the M terminal of the C7. Make sure that V
ANA
not exceed the permissible value. Where it is possible that the permissible
value might be exceeded (see technical specifications), establish a connection
between the AO-M terminal and the M terminal of the C7.
The abbreviations and mnemonics in the Figures 6-5 to 6-6 have the
following meanings:
AO-I:
Analog output: current
AO-U:
Analog output: voltage
R
:
Load/actuator
L
AO-M :
Ground terminal (reference potential of the analog output)
L+:
Terminal for 24 VDC supply voltage
M
:
Potential difference between M
ISO
C7.
Figures 6-5 to 6-6 show you how to connect loads/actuators to the current
and/or voltage outputs of the analog output module.
does
ISO
and the M terminal of the
ANA
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
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