Process Station ABB FieldController 800
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7.9 Technical data on Redundancy
Link monitoring Link monitoring between the Primary and a Secondary is carried out for
FieldControllers linked via the CAN modules at 250 ms / 500 KBits/s (1250
ms / 100 KBit/s). If the FieldControllers are only connected via the Red-Link
(Ethernet), link monitoring is ??? (approx. half the speed).
Failure detection Both FieldControllers (Primary and Secondary) are processing a monitor-
ing. The Secondary detects a failure of the Primary (redundancy toggle)
within 20 ms / 500 KBit/s (40 ms / 100 KBit/s). The Primary detects a failure
of the Secondary within 250 ms / 500 KBit/s (1250 ms / 100 KBit/s).
If the redundancy link is used for failure detection the Secondary detects a
failure of the Primary (redundancy toggle) within 40 ms / 500 KBit/s (80 ms /
100 KBit/s). The Primary detects a failure of the Secondary within 500 ms /
500 KBit/s (2500 ms / 100 KBit/s)
Redundancy toggle An automatic redundancy toggle is performed in less than 5 seconds if the
active FieldController (Primary) fails.
7.10 Changing a Non-Redundant Process Station into a Redundant one
• Export of every process station which should be redundant
a) block export of the resource process station in the project tree and
b) block export of all hardware objects of the process station in the hardware structure.
Block import of sub-projects enables a resource to be automatically made redundant via
the menu item → Edit → Import block as redundant. This means that the project elements
are filed and all variables are written in process image mode. Export of the individual proc-
ess stations enables the module insertion and I/O channel assignments to be accepted on
re-import, instead of disappearing as would otherwise be the case.
• The variables of the task to be implemented redundantly must be written in process image
mode, otherwise they will not be redundancy-capable. Please check your user programs for
variables which are not written in the process image (column P in the variables list). If you
consider that these variables cannot be written in process image mode because the informa-
tion within the task must be immediately available and may only be updated at the end of a
task cycle, you should directly renew the resource allocation for the variables or relocate the
program lists and Sequential Function Chart individually (see also next item)..
• The resources which are now to operate as redundant resources are deleted. Otherwise the
redundant resources are automatically renamed on import into the project pool, since the ob-
jects with the same name are still located in the project tree or the redundant tasks are in-
serted under newly inserted redundant resources and the program lists and sequence pro-
grams individually relocated. Please do not forget the contents of the system tasks. This
method should be chosen if all the variables cannot be written in process image mode or if not
all the tasks have to operate redundantly.
• In the project tree and using Edit → Import block as redundant, insert the resources which
were previously exported as redundant resources into the project pool.
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