Siemens Simatic S7-400 - Special Functions of a CPU 41 x

S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
iii
Table of contents
1 Introduction............................................................................................................................................. 1-1
2 Structure of a CPU 41x...........................................................................................................................
2-1
2.1 Control and display elements of the CPUs................................................................................
2-1
2.2 Monitoring functions of the CPU ................................................................................................
2-5
2.3 Status and error displays ...........................................................................................................
2-8
2.4 Mode selector switch ...............................................................................................................
2-11
2.5 Running a memory reset..........................................................................................................
2-13
2.6 Cold start / Warm restart / Hot restart......................................................................................
2-15
2.7 Structure and Functions of the Memory Cards........................................................................
2-17
2.8 Use of the Memory Cards ........................................................................................................
2-20
2.9 Multipoint Interface (MPI).........................................................................................................
2-22
2.10 PROFIBUS DP Interface..........................................................................................................
2-24
2.11 PROFINET (PN) interface........................................................................................................
2-25
2.12 Overview of the parameters for the S7-400 CPUs ..................................................................
2-26
3 Special functions of a CPU 41x ..............................................................................................................
3-1
3.1 Web Server ................................................................................................................................
3-1
3.2 Multicomputing...........................................................................................................................
3-3
3.2.1 Fundamentals ............................................................................................................................
3-3
3.2.2 Special Features at Multicomputing...........................................................................................
3-5
3.2.3 Multicomputing interrupt.............................................................................................................
3-6
3.2.4 Configuring and programming multicomputing mode................................................................
3-6
3.3 System modifications during operation......................................................................................
3-7
3.3.1 Basics.........................................................................................................................................
3-7
3.3.2 Hardware requirements .............................................................................................................
3-8
3.3.3 Software requirements.............................................................................................................
3-10
3.3.4 Permitted system modifications ...............................................................................................
3-11
3.4 Resetting the CPU to the factory state ....................................................................................
3-12
3.5 Updating firmware online .........................................................................................................
3-14
3.6 Reading out service data .........................................................................................................
3-15