Siemens SIMATIC S7-300 Module data User Manual

Priniples of analog value processing
4.5 Wiring resistance thermometers and resistors
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
4-11
3-wire connection of a resistance thermometer
When terminating 3-wire cables at modules equipped with four terminals, you should
generally bridge M-
and I
C
-. Always wire the connected
C
+ and M+ cables directly to the
resistance thermometer.
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Figure 4-10 3-wire connection of resistance thermometers to an electrically isolated analog input
2-wire connection of a resistance thermometer
For 2-wire connections, bridge the M
+
and I
C+
, and the M- and I
C
- terminals of the module.
The line resistance is measured at the same time.
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Figure 4-11 2-wire connection of resistance thermometers to an electrically isolated analog input

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)