Siemens SIMATIC S7-400H System Manual page 4

Table of contents
6 Special functions of a CPU 41x-H............................................................................................................ 61
6.1 Updating the firmware without a memory card ........................................................................... 61
6.2 Firmware update in RUN mode .................................................................................................. 63
6.3 Reading service data .................................................................................................................. 64
7 S7-400H in PROFIBUS DP mode............................................................................................................ 65
7.1 CPU 41x-H as PROFIBUS DP master ....................................................................................... 65
7.1.1 DP address areas of 41xH CPUs ............................................................................................... 66
7.1.2 CPU 41xH as PROFIBUS DP master......................................................................................... 66
7.1.3 Diagnostics of a 41xH CPU operating as PROFIBUS DP master .............................................. 69
7.2 Consistent Data........................................................................................................................... 73
7.2.1 Consistency of communication blocks and functions ................................................................. 74
7.2.2 Access to the CPU RAM ............................................................................................................. 74
7.2.3 Consistency rules for SFB 14 "GET" or reading tag and SFB 15 "PUT" or writing tag .............. 74
7.2.4 Reading data consistently from a DP standard slave and writing consistently to a DP
standard slave............................................................................................................................. 75
7.2.5 Consistent data access without using SFC 14 or SFC 15 .......................................................... 76
8 System and operating states of the S7-400H........................................................................................... 79
8.1 System and operating states of the S7-400H ............................................................................. 79
8.2 Introduction ................................................................................................................................. 80
8.3 The system states of the S7-400H.............................................................................................. 82
8.4 The operating states of the CPUs............................................................................................... 83
8.4.1 STOP operating state.................................................................................................................. 84
8.4.2 STARTUP operating state........................................................................................................... 85
8.4.3 LINK-UP and UPDATE operating states..................................................................................... 85
8.4.4 RUN operating state.................................................................................................................... 86
8.4.5 HOLD operating state ................................................................................................................. 87
8.4.6 TROUBLESHOOTING operating state ....................................................................................... 87
8.5 Self-test ....................................................................................................................................... 89
8.6 Time-based reaction ................................................................................................................... 92
8.7 Evaluation of process interrupts in the S7-400H system ............................................................ 92
9 Link-up and update .................................................................................................................................. 93
9.1 Effects of link-up and updating.................................................................................................... 93
9.2 Conditions for link-up and update ............................................................................................... 94
9.3 Link-up and update ..................................................................................................................... 95
9.3.1 Link-up sequence........................................................................................................................ 99
9.3.2 Update sequence ...................................................................................................................... 101
9.3.3 Switch to CPU with modified configuration or expanded memory configuration ...................... 103
9.3.4 Disabling link-up and update..................................................................................................... 105
9.4 Time monitoring ........................................................................................................................ 106
9.4.1 Time-based reaction ................................................................................................................. 108
9.4.2 Determining the monitoring times ............................................................................................. 109
9.4.3 Performance values for link-up and update .............................................................................. 115
9.4.4 Influences on time-based reaction ............................................................................................ 116
9.5 Special features in link-up and update operations.................................................................... 117
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System Manual, 09/2007, A5E00267695-03
S7-400H