Siemens Simatic S7-300 CPU 31xC Series User Manual

Table of contents
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
xi
Tables
Table 1-1
Ambient influence on the automation system (AS).................................................................... 1-1
Table 1-2 Galvanic isolation....................................................................................................................... 1-1
Table 1-3 Communication between sensors/actuators and the PLC......................................................... 1-2
Table 1-4 The use of local and distributed I/O ........................................................................................... 1-2
Table 1-5 Configuration consisting of the Central Unit (CU) and Expansion Modules (EMs) ................... 1-2
Table 1-6 CPU performance ...................................................................................................................... 1-3
Table 1-7 Communication .......................................................................................................................... 1-3
Table 1-8 Software ..................................................................................................................................... 1-3
Table 1-9 Supplementary features............................................................................................................. 1-4
Table 3-1 S7-300 components:.................................................................................................................. 3-2
Table 4-1 Mounting rails - Overview .......................................................................................................... 4-4
Table 4-2 Module width.............................................................................................................................. 4-4
Table 4-3 Shielding terminals - Overview ..................................................................................................4-5
Table 4-4 Interface modules - Overview ....................................................................................................4-8
Table 4-5 Cabinet types ........................................................................................................................... 4-13
Table 4-6 Cabinet selection ..................................................................................................................... 4-15
Table 4-7 VDE specifications for the installation of a PLC system .......................................................... 4-16
Table 4-8 Measures for protective grounding .......................................................................................... 4-22
Table 4-9 Connecting the load voltage reference potential ..................................................................... 4-23
Table 4-10 Connecting the load voltage reference potential ..................................................................... 4-24
Table 4-11 Connecting the load voltage reference potential ..................................................................... 4-25
Table 4-12 Features of load power supply units ........................................................................................ 4-26
Table 4-13 Subnet nodes........................................................................................................................... 4-31
Table 4-14 MPI/PROFIBUS DP addresses................................................................................................ 4-31
Table 4-15 MPI addresses of CPs/FMs in an S7-300 system ................................................................... 4-32
Table 4-16 Operating modes for CPUs with two DP interfaces................................................................. 4-34
Table 4-17 Permissible cable length of a segment on the MPI subnet...................................................... 4-35
Table 4-18 Permissible cable length of a segment on the PROFIBUS subnet.......................................... 4-35
Table 4-19 Lengths of stub cables per segment........................................................................................ 4-36
Table 4-20 PG patch cord .......................................................................................................................... 4-36
Table 4-21 Available bus cables ................................................................................................................ 4-37
Table 4-22 Properties of PROFIBUS cables.............................................................................................. 4-37
Table 4-23 Marginal conditions for wiring interior bus cables.................................................................... 4-38
Table 4-24 Bus connector .......................................................................................................................... 4-38
Table 4-25 Data for twisted-pair patch cables............................................................................................ 4-55
Table 5-1 Module accessories ................................................................................................................... 5-2

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)