LENZE E82EV553K4B201 E82EV553K4B201 E82EV553K4B201 E82EV553K4B201 E82EV553K4B201

SYNCUP → RUN-Solo, RUN-Syncup → RUN
Transition Description Effects
System state
transition
SYNCUP → RUN-Solo
The redundant system switches from the SYNCUP system state to the RUNSolo
system state if:
• You execute POWER OFF for the backup CPU
or
• The redundant system detects an error during SYNCUP that prevents
redundant operation
or
• You set the backup CPU to STOP with the PG/PC, the display or the
mode selector.
This system state transition
does not have
any effect on data.
Primary CPU
operating state
transition
RUN-Syncup → RUN
The primary CPU switches from the RUN-Syncup operating state to the RUN
operating state and continues to execute the user program.
These operating state
transitions have no
effect on data.The redundant system switches from the STARTUP system state to the
STOP system state if:
• The primary CPU detects an error during startup that prevents further
processing
or
• You set the primary CPU to STOP with the PG/PC, the display or the
mode selector
or
• The primary CPU processes a STOP command in the startup OB
or
• In the CPU properties, you have set the following for startup behavior:
– Too short a configuration time for the distributed I/O and
– "Startup CPU only if compatible"
The primary CPU switches to STOP.
This system state transition
does not have
any effect on data.
Primary CPU
operating state
transition
This operating state
transition does not
have any effect on
data.The redundant system switches from the SYNCUP system state to the STOP
system state if:
• You set the primary CPU or both CPUs to STOP with the PG/PC, the
display or the mode selector.
• SYNCUP is aborted as a result of an error in the primary CPU or in both
CPUs.
This system state transition
does not have
any effect on data.Operating state
transitions
RUN-Syncup → STOP
The primary CPU switches from the RUN-Syncup operating state to the
STOP operating state if:
• The primary CPU detects an error that prevents further processing
or
• You set the primary CPU to STOP with the PG/PC, the display or the
mode selector
or
• The redundant system processes a STOP command in the user program.
These operating state
transitions have no
effect on data.
SYNCUP → STOP
The backup CPU restarts and switches to the STOP operating state after
SYNCUP aborts if:
• SYNCUP is aborted due to an error (for causes and remedies, see section
SYNCUP system state (Page 205))
or
• You set the CPU to STOP with the PG/PC, the display or the mode selecThe following section explains in more detail the system and operating state transitions ⑦,
RUN-Redundant → RUN-Solo and RUN-Redundant → RUN from the System and operating
state transitions (Page 217) section.
Response
Loss of redundancy means:
● The redundant system switches from the RUN-Redundant system state to the RUN-Solo
system state.
● The primary CPU switches from the RUN-Redundant operating state to RUN (1)
or
● Primary-backup switchover: The backup CPU becomes the primary CPU and switches
from the RUN-Redundant operating state to RUN (2).
The primary CPU continues to execute the user program in the RUN operating state and
exchanges process data with the IO devices.
Causes of redundancy loss
The redundant system switches from the RUN-Redundant system state to RUN-Solo if:
● You POWER OFF one of the CPUs.
● You set one of the two CPUs to STOP with the PG/PC, the display or the mode selector.
● A CPU detects an error that prevents continued processing, for example:
– Failure of a CPU, for example as a result of a hardware defect.