The Operating States Of The Cpus; Figure 11-2 System And Operating States Of The Fault-Tolerant System - Siemens SIMATIC S7-400H System Manual
Fault-tolerant systems
Hide thumbs
Also See for SIMATIC S7-400H:
- System manual (376 pages) ,
- Manual (337 pages) ,
- Manual (5 pages)
Table of Contents
Advertisement
System and operating states of the S7–400H
11.3 The operating states of the CPUs
11.3
The operating states of the CPUs
Operating states describe the behavior of the CPUs at any given point in time. Knowledge of
the operating states of the CPUs is useful for programming the startup, test, and error
diagnostics.
Operating states from POWER ON to redundant system state
Generally speaking, the two CPUs enjoy equal rights so that either can be the master or the
standby CPU. For reasons of legibility, the illustration presumes that the master CPU
(CPU 0) is started up before the standby CPU (CPU 1) is switched on.
The following figure shows the operating states of the two CPUs, from POWER ON to
redundant system state. The HOLD HOLD mode (Page 135) and ERROR-SEARCH
ERROR-SEARCH mode (Page 135) states are a special feature and are not shown.
Figure 11-2
System and operating states of the fault-tolerant system
130
System Manual, 03/2012, A5E00267695-11
S7-400H
Advertisement
Table of Contents
