Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 7)

CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
vii
Table of contents
Preface ......................................................................................................................................................iii
1
Guide to the S7-300 documentation ....................................................................................................... 1-1
2 Operating and display elements ............................................................................................................. 2-1
2.1
Operating and display elements: CPU 31xC ............................................................................. 2-1
2.1.1 Status and Error Indicators: CPU 31xC ..................................................................................... 2-4
2.2 Operating and display elements: CPU 31x................................................................................ 2-5
2.2.1 Operating and display elements: CPU 312, 314, 315-2 DP: ..................................................... 2-5
2.2.2 Operating and display elements: CPU 317-2 DP ...................................................................... 2-7
2.2.3 Operating and display elements: CPU 31x-2 PN/DP ................................................................ 2-9
2.2.4 Status and error displays of the CPU 31x................................................................................ 2-11
3 Communication....................................................................................................................................... 3-1
3.1 Interfaces ................................................................................................................................... 3-1
3.1.1 Multi-Point Interface (MPI) ......................................................................................................... 3-1
3.1.2 PROFIBUS DP........................................................................................................................... 3-2
3.1.3 PROFINET (PN)......................................................................................................................... 3-3
3.1.4 Point to Point (PtP) .................................................................................................................... 3-5
3.2 Communication services............................................................................................................ 3-6
3.2.1 Overview of communication services ........................................................................................ 3-6
3.2.2 PG communication..................................................................................................................... 3-7
3.2.3 OP communication..................................................................................................................... 3-7
3.2.4 Data exchanged by means of S7 basic communication............................................................ 3-7
3.2.5 S7 communication ..................................................................................................................... 3-8
3.2.6 Global data communication (MPI only)...................................................................................... 3-9
3.2.7 Routing..................................................................................................................................... 3-10
3.2.8 PtP communication .................................................................................................................. 3-15
3.2.9 Data consistency...................................................................................................................... 3-16
3.2.10 Communication via PROFINET (only CPU 31x-2 PN/DP) ...................................................... 3-16
3.2.10.1 PROFINET IO System ............................................................................................................. 3-19
3.2.10.2 Blocks in PROFINET IO........................................................................................................... 3-20
3.2.10.3 System status lists (SSLs) in PROFINET IO ........................................................................... 3-23
3.2.10.4 Open communication via Industrial Ethernet........................................................................... 3-24
3.2.10.5 SNMP communication service................................................................................................. 3-26
3.3 S7
connections ........................................................................................................................ 3-26
3.3.1 S7 connection as communication path .................................................................................... 3-26
3.3.2 Assignment of S7 connections................................................................................................. 3-27
3.3.3 Distribution and availability of S7 connection resources ......................................................... 3-29
3.3.4 Connection resources for routing............................................................................................. 3-31
3.4 DPV1........................................................................................................................................ 3-32