Siemens SIMATIC S7-300 Module data Hardware And Installation Manual

Configuring
S7-300 Programmable Controller Hardware and Installation
4-16 A5E00105492-01
M
L+
M
47 nF 1 MW
M
removable
Jumper
removable
jumper
Ground bus
Figure 4-7 S7-300 configuration with grounded reference potential
4.8.3 S7-300 assembly with floating reference potential (not CPU 312
IFM and CPU 31xC)
Introduction
In an S7-300 installation with floating reference potential, occurring interference
current is dissipated to the ground conductor/ to ground via an RC combination
integrated in the CPU. A configuration with grounded reference potential is
possible with following CPUs:
CPU 313, 314, 314 IFM, 315, 315-2 DP, 316-2 DP, 318-2 DP.
Application
In larger plants it might be required to install the S7-300 with floating reference
potential because of short-circuit to ground monitoring. This is the case, for
example, in chemical industry and power stations.

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)