Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-47
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
You can operate the CPU in Grounded mode (refer to the figure below) or
Ungrounded mode.
Isolated
sensors
M+
M
L+
M–
M
ANA
M+
M–
Backplane
bus
ADC
M
internal
L+
M
Ground bus
CPU
U
ISO
Recommended
connection
Logic
Figure 4-7 Connecting Isolated Sensors to an Isolated AI
Isolated
sensors
M+
M
L+
M–
M
ANA
M+
M–
Backplane
bus
M
internal
L+
M
Ground bus
CPU
ADC
Recommended
connection
Logic
Figure 4-8 Connecting Isolated Sensors to a Non-Isolated AI
Note
Do not connect M– to M
ANA
when connecting 2-wire transmitters for current
measurement and resistance-type sensors. This also applies to inputs which are
not used.

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)