Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-109
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Terminal Connection Diagram and Block Diagram of the SM 331; AI 8 x 13 bits
The following figure shows some examples of connections for the different types of
measurements on channels 4 to 7. Basically, these connection examples apply to
all channels (channel 0 to 7).
S–
2
20
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
22
40
21
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Channel
number
2
1
3
4
5
6
7
0
2
1
3
4
5
6
7
0
2
1
3
4
5
6
7
0
2
1
3
4
5
6
7
0
Logic
and
back-
plane
bus
ac-
tiva-
tion
ADC
Electrical
isolation
Internal supply
Current
source
+ 5 V from
backplane bus
Ch 0
Ch 1
Ch 2
Ch 3
M+
Connection example
Multiplexer
Ch 4
Ch 5
Ch 6
Ch 7
M–
M–
M+
M–
I+
M–
U+
A
mV
V
I+
M+
S–
U+
S–
M+
U+
I+
S–
U+
I+
M+
M–
M–
M+
I+
M–
U+
I+
M+
S–
U+
S–
M+
U+
I+
S–
U+
I+
S–
M–
Figure 4-39 Module View and Block Diagram of the Analog Input Module SM 331; AI 8 x 13
bits
Note
When connecting the voltage and current sensors, make sure that you do not
exceed the maximum permitted common-mode voltage U
CM
of 2 V between the
inputs. So to prevent measuring errors, interconnect the individual M– terminals.
It is not necessary to interconnect the M– terminals when measuring resistors and
resistance temperature detectors.

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)