Siemens SIMATIC S7-300 Module data User Manual

Analog modules
6.3 Analog input module SM 331; AI 8 x 16 Bit; (6ES7331-7NF00-0AB0)
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
6-9
Terminal assignment
The following diagrams show different possible forms of wiring
Wiring: Voltage and current measurement
For current measurements, wire the channel's voltage inputs with relevant current measuring
resistor in parallel. Do so by bridging the channel's input terminals to the adjacent terminals
of the connector.
Example: Set up channel 0 for current measurements by bridging terminals 22 and 2, and
terminals 23 to 3.
At the channel configured for current measurements, connect the current measuring resistor
to the adjacent channel terminals in order to achieve the specified accuracy.







വ
&+



വ


വ


വ




വ


വ


വ


വ






















9
9
9
9
9
9
9
6)

ದ
&+

ದ
&+

ದ
&+

ದ
&+

ದ
&+

ದ
&+

ದ
&+
9

ದ
Figure 6-1 Wiring and block diagrams
① Voltage measurement
② Backplane bus interface
③ Electrical isolation
④ Analog-to-Digital Converter (ADC)
⑤ Potential compensation

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)