Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-65
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Connecting thermocouples with resistance thermometer to the
SM 331; AI 8 x TC
With this type of compensation, the reference junction terminal temperature is
determined by a bulb resistor sensor with a temperature range of -25 °C to 85 °C.
Backplane
bus
ADC
M
L+
Compensating
leads (same
material as
thermocouple)
Ref. junction
Copper
wire
KV–
KV+
Thermo-
couples
IC
+
IC
–
Pt 100
KV+
KV–
KV+
KV–
K0
K7
P5V
M internal
Logic
Figure 4-27 Connecting thermocouples with external compensation via resistance thermometers 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)