Conditions For Link-Up And Update; Time Monitoring; Table 8- 2 Conditions For Link-Up And Update - Siemens CPU 410-5H Process Automation System Manual

Link-up and update

8.2 Conditions for link-up and update

8.2 Conditions for link-up and update
Which commands you can use on the programming device to initiate a link-up and update
operation is determined by the current conditions on the master and standby CPU. The table
below shows the correlation between those conditions and available programming device
commands for link-up and update operations.
Table 8- 2
Link-up and update as
PG command:
Restart of the standby
Switch to CPU with
modified configuration
Switching to CPU with
modified operating
system
CPUs with changed
hardware version
Only one
synchronization link-up
is available over only
one intact redundant
link
8.3

Time monitoring

Program execution is interrupted for a certain time during updating. This section is relevant
to you if this period is critical in your process. If this is the case, configure one of the
monitoring times described below.
During updating, the fault-tolerant system monitors the cycle time extension, communication
delay and inhibit time for priority classes > 15 in order to ensure that their configured
maximum values are not exceeded, and that the configured minimum I/O retention time is
maintained.
Note
If you have not defined any default values for the monitoring times, make allowance for the
update in the scan cycle monitoring time. If in this case the update is cancelled, the fault-
tolerant system switches to standalone mode: The previous master CPU remains in RUN,
and the standby CPU goes into STOP.
You can either configure all the monitoring times or none at all.
You made allowances for the technological requirements in your configuration of monitoring
times.
The monitoring times are described in detail below.
110
Conditions for link-up and update
FW version in the
master and standby
CPUs
Are identical
Are identical
Are different
Are identical
Are identical
Available sync
connections
2
2
2
2
1
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Hardware version on
master and standby
CPU
Are identical
Are identical
Are identical
Are different
Are identical