System States Of The S7-400H; The System States Of The S7-400H; Table 11- 1 Overview Of S7-400H System States - Siemens SIMATIC S7-400H System Manual

System and operating states of the S7–400H
11.2 System states of the S7–400H
11.2 System states of the S7–400H
11.2.1

The system states of the S7-400H

The system states of the S7-400H result from the operating states of the two CPUs. The
term "system state" is used as a simplified term which identifies the concurrent operating
states of the two CPUs.
Example: Instead of "the master CPU is in RUN and the reserve CPU is in LINK-UP mode"
we say "the S7-400H system is in link-up mode".
Overview of system states
The table below provides an overview of the possible states of the S7-400H system.
Table 11- 1
System states of the S7–400H
Stop
Start-up
Single mode
Link-up
Update
Redundant
Hold
124
Overview of S7-400H system states
Operating states of the two CPUs
Master
STOP
STARTUP
RUN
RUN
RUN
RUN
HOLD
Reserve
STOP, power off, DEFECTIVE
STOP, power off, DEFECTIVE, no
synchronization
STOP, ERROR-SEARCH, power off,
DEFECTIVE, no synchronization
STARTUP, LINK-UP
UPDATE
RUN
STOP, ERROR-SEARCH, power off,
DEFECTIVE, no synchronization
System Manual, 03/2012, A5E00267695-11
S7-400H