Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-64
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Connecting thermocouples with temperature compensation to the
SM 331; AI 8 x TC
All 8 inputs are available as measurement channels when the thermocouples are
connected via reference junctions that are controlled at 0 °C or 50 °C.
Backplane
bus
ADUs
L+
M
K7
K0
M+
M-
M+
M-
M+
M-
Copper
wire
Reference junction
controlled at
0C or 50C
K6
.
.
.
Logic
Figure 4-26 Connecting thermocouples via a reference junction to the
SM 331; AI 8 x TC

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)