S7-300 Assembly With Floating Reference Potential (Not Cpu 312 Ifm And Cpu 31Xc); S7-300 Configuration With Grounded Reference Potential - Siemens SIMATIC S7-300 Hardware And Installation Manual

Configuring
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.
4-16
removable
jumper
Ground bus
M
M
L +
M
S7-300 Programmable Controller Hardware and Installation
removable
Jumper
47 nF 1 MW
A5E00105492-01