Table of contents
S7-400 Automation System, CPU Specifications
iv Manual, 10/2006, 6ES7498-8AA04-8BA0
4 Communication....................................................................................................................................... 4-1
4.1 interfaces....................................................................................................................................
4-1
4.1.1 Multi-Point Interface (MPI) .........................................................................................................
4-1
4.1.2 PROFIBUS DP...........................................................................................................................
4-2
4.1.3 PROFINET .................................................................................................................................
4-4
4.2 Communication services ............................................................................................................
4-6
4.2.1 Overview of communication services.........................................................................................
4-6
4.2.2 PG communication.....................................................................................................................
4-7
4.2.3 OP communication.....................................................................................................................
4-7
4.2.4 S7 basic communication ............................................................................................................
4-8
4.2.5 S7 communication......................................................................................................................
4-9
4.2.6 Global data communication......................................................................................................
4-11
4.2.7 Routing.....................................................................................................................................
4-13
4.3 S7 connections.........................................................................................................................
4-18
4.3.1 Communication path of an S7 connection ...............................................................................
4-18
4.3.2 Assignment of S7 connections.................................................................................................
4-19
4.3.3 Distribution and availability of S7 connection resources..........................................................
4-21
5 PROFIBUS DP .......................................................................................................................................
5-1
5.1 CPU 41x-3 PN/DP as DP master / DP slave .............................................................................
5-1
5.1.1 Overview ....................................................................................................................................
5-1
5.1.2 DP address areas of 41x CPUs .................................................................................................
5-2
5.1.3 CPU 41x as PROFIBUS DP master ..........................................................................................
5-3
5.1.4 Diagnostics of the CPU 41x as DP master ................................................................................
5-6
5.1.5 CPU 41x as DP slave...............................................................................................................
5-11
5.1.6 Diagnostics of the CPU 41x as DP slave.................................................................................
5-16
5.1.7 CPU 41x as DP slave: Station statuses 1 to 3.........................................................................
5-21
5.1.8 Direct Data Exchange ..............................................................................................................
5-28
5.1.8.1 Principle of direct data exchange.............................................................................................
5-28
5.1.8.2 Diagnostics in direct data exchange ........................................................................................
5-29
6 PROFINET .............................................................................................................................................
6-1
6.1 Introduction ................................................................................................................................
6-1
6.2 PROFINET IO and PROFINET CBA .........................................................................................
6-2
6.3 PROFINET IO Systems .............................................................................................................
6-4
6.4 Blocks in PROFINET IO.............................................................................................................
6-6
6.5 System status lists for PROFINET IO ........................................................................................
6-8
6.6 Open Communication Via Industrial Ethernet..........................................................................
6-10
6.7 SNMP Communication Service................................................................................................
6-13
6.8 PN/IO Address Areas of the CPUs 41x-3PN/DP .....................................................................
6-14
7 Consistent Data ......................................................................................................................................
7-1
7.1 Basics.........................................................................................................................................
7-1
7.2 Consistency for communication blocks and functions ...............................................................
7-2
7.3 Consistent Reading and Writing of Data from and to DP Standard Slaves/IO Devices ............
7-3
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