Siemens SIMATIC CPU 410

Table of contents
CPU 410 Process Automation/CPU 410 SMART
4 System Manual, 05/2017, A5E31622160-AC
6.2 Fail-safe operation ................................................................................................................. 58
6.3 Fault-tolerant automation systems (redundancy operation) .................................................. 61
6.3.1 Redundant SIMATIC automation systems ............................................................................. 61
6.3.2 Increase of plant availability, reaction to errors ..................................................................... 62
6.4 Introduction to the I/O link to fault-tolerant system ................................................................ 65
6.5 Using single-channel switched I/O ......................................................................................... 66
6.6 Versions of I/O connection to the PROFINET IO interface .................................................... 73
6.6.1 Use of I/O connected to the PROFINET IO interface, system redundancy ........................... 73
6.6.2 Redundant I/O in an ET 200SP HA ....................................................................................... 76
6.7 Connection of two-channel I/O to the PROFIBUS DP interface ............................................ 80
6.7.1 Connecting redundant I/O ...................................................................................................... 80
6.7.2 Signal modules for redundancy ............................................................................................. 83
6.7.3 Evaluating the passivation status ........................................................................................... 97
6.8 Media redundancy ................................................................................................................. 97
7 System and operating states of the CPU 410 ....................................................................................... 101
7.1 CPU 410 operating modes ................................................................................................... 101
7.1.1 RUN mode ........................................................................................................................... 101
7.1.2 STOP mode ......................................................................................................................... 102
7.1.3 STARTUP mode .................................................................................................................. 103
7.1.4 HOLD mode ......................................................................................................................... 104
7.1.5 LINK-UP and UPDATE modes ............................................................................................ 105
7.1.6 ERROR-SEARCH mode ...................................................................................................... 105
7.1.7 DEFECTIVE state ................................................................................................................ 106
7.2 System states of the redundant CPU 410 ........................................................................... 107
7.2.1 Introduction .......................................................................................................................... 107
7.2.2 The system states of the fault-tolerant system .................................................................... 109
7.2.3 Displaying and changing the system state of a fault-tolerant system .................................. 110
7.2.4 System status change from the STOP system state ........................................................... 110
7.2.5 System status change from the standalone mode system status ....................................... 111
7.2.6 System status change from the redundant system state ..................................................... 111
7.2.7 System diagnostics of a fault-tolerant system ..................................................................... 112
7.3 Self-test ................................................................................................................................ 114
7.4 Performing a memory reset ................................................................................................. 117
8 Link-up and update .............................................................................................................................. 119
8.1 Effects of link-up and updating ............................................................................................. 119
8.2 Link-up and update via an ES command ............................................................................. 120
8.3 Time monitoring ................................................................................................................... 120
8.3.1 Time response ..................................................................................................................... 123
8.3.2 Determining the monitoring times ........................................................................................ 123
8.3.3 Performance values for link-up and update ......................................................................... 130
8.3.4 Influences on time response ................................................................................................ 130
8.4 Special features in link-up and update operations ............................................................... 131