Analog Modules
4-50
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
4.9 Connecting Voltage Sensors
Note
The necessary connecting cables, which result from the potential connection of the
analog input module and the sensors, are not drawn in the figures shown below.
In other words, you must continue to take note of and implement Section 4.8 with
its generally valid information for connecting sensors.
Abbreviations and mnemonics used in the figure below
The abbreviations and mnemonics used in the figure below have the following
meanings:
M +: Measuring lead (positive)
M–: Measuring lead (negative)
M
ANA
: Reference potential of the analog measuring circuit
M : Ground terminal
L +: Terminal for 24 VDC supply voltage
U +: Measuring lead for voltage input
Connection of voltage sensors
M+
M
L+
M–
M
ANA
M+
M–
ADC
+
–
U
+
–
U
Backplane
bus
Logic
Figure 4-11 Connecting Voltage Sensors to an Isolated AI
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