Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-154
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Terminal Connection Diagram and Block Diagram of the SM 331; AI 2 x 12 bits
Fault indicator – red
Thermocouples,
Voltage measurement
Current measurement
Resistance test
M
0 +
M
0
*
M
1 +
SF
Internal
supply
L+
Current
source
Multi-
plexer
Meas. range
module
None
ADC
Isolation
Backplane
bus
interface
SF
+
Internal
compensation
CH0
M
0 +
CH0
M
0
*
I
C0 +
CH1
M
1
*
I
C0
*
24V
Comp–/ Mana
Comp +
External
compensation
Comp
M
T
Figure 4-49 Module View and Block Diagram of the Analog Input Module SM 331; AI 2 x 12 bits
The input resistances depend on the measuring range selected (refer to the
technical specifications for the module).

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)