Siemens SIMATIC S7-300 Reference Manual page 272
Programmable logic controllers module data
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Analog Modules
4.13
Connecting Loads/Actuators to analogo output
Introduction
You can use the analog output modules to supply loads and actuators with current
and voltage.
This section contains general information that is generally applicable to all the
connection options for loads and actuators described in the sections that follow.
Cables for analog signals
For the analog signals
Q
and S+ and M and S–, respectively, are to be twisted together. This reduces the
V
interference
If there are potential differences between the cable ends, an equipotential bonding
current, which can flow over the shield, can cause interference of the analog
signals. In such a case, you should ground the shield at one end of the cable only.
Isolated Analog Output Modules
With the isolated analog output modules there is no electrical connection between
the reference point of the measuring circuit M
You must use isolated analog output modules if a potential difference U
occur between the reference point of the measuring circuit M
M terminal of the CPU. By means of a equipotential bonding conductor between
the M
ANA
exceed the permitted value.
Non-Isolated Analog Output Modules
With the non-isolated analog output modules, you must establish a connection
between the reference point of the measuring circuit M
the CPU. Therefore, connect the M
potential difference between M
corruption of the analog signal.
4-66
you should use shielded and twisted pair cables. The cables
,
Ground the screen of the analog cables at both ends of the cables.
.
terminal and the M terminal of the CPU, make sure that U
ANA
and the M terminal of the CPU.
ANA
ANA
terminal with the M terminal of the CPU. A
ANA
and the M terminal of the CPU can lead to a
Programmable Logic Controllers S7-300 Module Data
can
ISO
and the
ANA
does not
ISO
and the M terminal of
A5E00105505-03
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