Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-55
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Two-conductor connection of a resistance thermometer
With a two-conductor connection, you must insert jumpers on the module between
M
+
and I
C+
and between M
–
and I
C–
.
M+
M
L+
M–
M
ANA
ADC
I
C+
I
C–
Backplane
bus
Logic
Figure 4-17 Two-Conductor Connection of Resistance Thermometers to an Isolated AI
Three-conductor connection to the SM 331; AI 8 RTD
With a three-conductor connection to the SM 331; AI 8 RTD you must insert a
jumper between M
+
and I
C+
(refer to figure4-18).
When connecting, make sure that the connected cables I
C
– and M– are connected
directly to the resistance thermometer.
M+
M
L+
M–
M
ANA
ADC
I
C+
I
C–
I
C
Backplane
bus
Logic
Figure 4-18 Three-Conductor Connection of Resistance Thermometers to the SM 331;
AI 8 x RTD
!
Caution
Due to incorrect wiring of the three-conductor connection, unforeseen operation of
the module and dangerous conditions can result in the system.

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)