Siemens SIMATIC S7-300 Reference Manual page 266

Analog Modules
Abbreviations and mnemonics used in the figures below
The abbreviations and mnemonics used in the figures below have the following
meanings:
M +:
M–:
I +:
C
I -:
C
COMP
COMP
M
ANA
M :
L +:
P5V:
KV +/KV –:
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.
4-60
Measuring lead (positive)
Measuring lead (negative)
Positive connection of constant current output
Negative connection of constant current output
: Compensating terminal (positive)
+
: Compensating terminal (negative)
–
: Reference potential of the analog measuring circuit
Ground terminal
Terminal for 24 VDC supply voltage
Module logic power supply
Connections to the shunt comparison
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03