Siemens CPU 313C Hardware And Installation Guide

Configuring
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
5-26 A5E00105492-03
5.8.6 Overview: Grounding
CPU 31xC
The figure below shows you the complete assembly of an S7-300 with CPU 31xC
with a power supply from TN-S mains.
Apart from powering the CPU, the PS 307 also supplies the load current for the
24 VDC modules.
Note: The arrangement displayed does not correspond with the physical
arrangement; it was merely selected to give you a clear overview.
Cabinet
Rail
PS
CPU
SM
L1
N
L+
M
µP
AC
AC
AC
AC
DC
DC
L1
L2
L3
N
PE
1
Low-voltage distribution
e. g. TN-S system (3 x 400 V)
Ground bus in cabinet
AC 24 to 230 V load circuit for
AC modules
DC 5 to 60 V load circuit for
non-isolated DC modules
DC 5 to 60 V load circuit for
isolated DC modules
Signal modules
1
3
2
2
2
4
Figure 5-11 Grounding concept for the S7-300 with CPU 31xC
Table 5-10 Connection of the load voltage reference potential
The diagram illustrates under number
(1) Main switch
(2) Short-circuit/overload protection
(3) Load power supply (galvanic isolation)
(4) This connection is automatically generated for the CPU 31xC

Siemens CPU 313C Specifications

General

MPI Interface	Yes
Number of digital inputs	24
Number of digital outputs	16
Number of analog inputs	4
Number of analog outputs	2
Supply voltage	24 V DC
High-speed counters	Yes
Bit Operations Execution Time	0.1 µs
Word Operations Execution Time	0.2 µs
Power Consumption	5 W
Dimensions (W x H x D)	40 x 125 x 130 mm
Operating Temperature	0 to 60 °C
Communication Interfaces	MPI
Programming Languages	LAD, FBD, STL
Product type designation	CPU 313C
Weight	490 g