Link-Up And Update; Effects Of Link-Up And Updating; Table 8- 1 Properties Of Link-Up And Update Functions - Siemens SIMATIC PCS 7 System Manual

Link-up and update

8.1

Effects of link-up and updating

Link-up and updating are indicated by the REDF LEDs on the two CPUs. During link-up, the
LEDs flash at a frequency of 0.5 Hz, and when updating at a frequency of 2 Hz.
Link-up and update have various effects on user program execution and on communication
functions.
Table 8- 1
Process
Execution of the user pro-
gram
Deleting, loading, generat-
ing, and compressing of
blocks
Execution of communication
functions, PG operation
CPU self-test
Test and commissioning
functions, such as "Monitor
and modify variable", "Moni-
tor (On/Off)"
Handling of the connections
on the master CPU
Handling of the connections
on the reserve CPU
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB
Properties of link-up and update functions
Link-up
All priority classes (OBs) are
processed.
Blocks cannot be deleted,
loaded, created or com-
pressed.
When such actions are busy,
link-up and update operations
are inhibited.
Communication functions are
executed.
Not performed
Test and commissioning func-
tions are disabled.
When such actions are busy,
link-up and update operations
are inhibited.
All connections are retained;
no new connections can be
made.
All the connections are can-
celled; no new connections can
be made.
Update
Processing of the priority classes is
delayed section by section. All re-
quests are caught up with after the
update.
For details, refer to the sections be-
low.
Blocks cannot be deleted, loaded,
created or compressed.
Execution of the functions is restrict-
ed section by section and delayed. All
the delayed functions are caught up
with after the update.
For details, refer to the sections be-
low.
Not performed
Test and commissioning functions
are disabled.
All connections are retained; no new
connections can be made.
Interrupted connections are not re-
stored until the update is completed
All connections are already down.
Cancellation takes place during link-
up. Connections of the standby are
not established until Redundant sys-
tem state.
8
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