User Manual - AnyBus® Communicator
DOC. ID: SDN-7061-059 Rev.1.51
2002-10-30
23
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Offline options for fieldbus
The action to take for this transaction if the fieldbus goes off-line. This action affects
the data that is sent on the sub-network.
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The data is cleared (0) on the sub-network if the fieldbus goes offline
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The data is frozen on the sub-network if the fieldbus goes offline
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Stop sub-net scanning for this transaction if the fieldbus goes offline
Update mode
The update mode for the transaction
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The data is transmitted cyclically. The update frequency is determined by the
Update Time
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The data is updated when any data in the message has changed
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The data is transmitted once at startup
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The data is transmitted when the trigger byte has changed. (See ‘Trigger byte
address’ below)
Update time (10ms)
This value determines how often the data is updated on the sub-network. A value of
0x000A equals 100ms. Valid settings range from 0x0000 to 0xFFFF.
Trigger byte address
This parameter specifies location of the trigger byte in the internal memory buffer.
If ‘Update mode’ is set to ‘Change of state on trigger’, the memory location specified
by this parameter is monitored by the ABC. Whenever the trigger byte is updated, the
ABC will produce the transaction on the sub-network.
This way, the fieldbus control system can when required instruct the ABC to produce
a specific transaction on the sub-network by updating it’s trigger byte.
The trigger byte should be incremented by one for each activation.
This parameter has no affect unless the ‘Update mode’ parameter is set to ‘Change of
state on trigger’.