Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-68
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Connecting Loads to a Voltage Output of an Isolated Module over a
Four-Conductor Connection
A high accuracy at the load can be achieved through the four-conductor
connection. You must therefore connect the sensor leads (S– and S+) directly to
the load. The voltage is thus measured and corrected directly at the load.
Interferences or a voltage drop can result in a potential difference between the
sensor lead S– and the reference circuit of the analog circuit M
ANA
. This potential
difference must not exceed the permissible value. If the permissible potential
difference is exceeded, the accuracy of the analog signal is impaired.
M
L+
DAC
R
L
Q
V
M
ANA
M
internal
L+
M
Ground bus
CPU
S+
S–
U
ISO
Backplane
bus
Logic
Figure 4-28 Connecting Loads to a Voltage Output of an Isolated AO over a Four-Conductor Connection

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)