Siemens SIMATIC S7-400H - Page 7

Table of contents
S7-400H
System Manual, 03/2012, A5E00267695-11
7
11 System and operating states of the S7–400H........................................................................................ 121
11.1 Introduction ................................................................................................................................121
11.2 Syst
em states of the S7–400H...................................................................................................124
11.2.1 The system states of the S7-400H
............................................................................................124
11.2.2 Displaying an
d changing the system state of a fault-tolerant system........................................125
11.2.3 Syst
em status change from the STOP system state .................................................................126
11.2.4 System s
tatus change from the standalone mode system status .............................................126
11.2.5 Syst
em status change from the redundant system state...........................................................127
11.2.6 Syst
em diagnostics of a fault-tolerant system ...........................................................................128
11.3 The operating states
of the CPUs..............................................................................................130
11.3.1 STOP mode ...............................................................................................................................131
11.3.2
STARTUP mode ........................................................................................................................132
11.3.3
LINK-UP and UPDATE modes ..................................................................................................133
11.3.4
RUN mode .................................................................................................................................133
11.3.5
HOLD mode ..............................................................................................................
.................135
11.3.6 ERROR-SEARCH mode............................................................................................................135
11.4
Self-test................................................................................................................
......................137
11.5 Evaluation of hard
ware interrupts in the S7-400H system ........................................................140
12 Link-up and update
................................................................................................................................ 141
12.1 Effects
of link-up and updating...................................................................................................141
12.2 Conditions for link-up and update ........................................................................................
......142
12.3 Link-up and update sequence....................................................................................................143
12.3.1 Link-up s
e
quence.......................................................................................................................147
12.3.2 Update sequence........................................................................................................
...............149
12.3.3 Switch to CPU
with modified configuration or expanded memory configuration.......................152
12.3.4 Disabling of link-up and update........................................................................................
..........154
12.4 Time monitoring .........................................................................................................................155
12.4.1
Time response ..........................................................................................................
.................158
12.4.2 Determining the monitoring times ..............................................................................................159
12.4.3
Performance v
alues for link-up and update ...............................................................................166
12.4.4 Influences on time response......................................................................................................167
12.5
Special features in link-up and update operations.....................................................................168
13
Using I/
Os in S7–400H .......................................................................................................................... 169
13.1 Introduction .............................................................................................................
...................169
13.2 Using single-channel, one-sided I/Os
........................................................................................171
13.3 Using single-channel
switched I/O.............................................................................................173
13.4 Connecting redundant I/O to the PROFIBUS DP interface .......................................................177
13.4.1 Signal modules for redundancy ..........................................................................................
.......187
13.4.2
Evaluating the passi
vation status ..............................................................................................206
13.5 Other options for connecting redundant I/Os
.............................................................................207