Input and Output Signals
Publication PUB088-005-00_1017
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Backup or Primary Channel
This bit is used to indicate if the Profibus communication is to a
channel on the card that is able to move the valve (Primary) or to a
channel that is prevented from operating the valve (Backup).
When the communication is to the Primary Profibus DP channel the
bit will be off (0).
1 or 2 Channels Available
This bit indicates the condition of the second channel on a dual
channel card. It will be true (1) if both channels are available and
working on the card. It does not indicate the status of the connection
or highway to the second channel.
On a single channel card it will always report (0).
If there is a fault on the second channel of a dual channel card it will
report (0), indicating that the second channel is not working correctly.
SR or FR Mode
This bit indicates the addressing mode chosen for the card. When
reporting as (0) the bit indicates that one address is being used. On a
single channel card only one address is permitted.
On a dual channel card a single address is used when two Profibus
DP highways are used and the System Redundancy is employed.
If the bit reports as (1) then the card must be dual channel and the
redundancy is using two addresses for Flying Redundancy
configuration.
Note:
With
a single channel card this bit will always indicate ‘Primary’ and be (0).
With a dual card set to FR mode there is only one highway and the card uses two
addresses, one per channel. If the communication is directed to the address for the
backup channel this bit will be set to 1; if it is to the address for the primary channel it
will be set to 0.
With a dual card set to SR mode only one address is used, but there are two highways.
If the communication is direct on the highway connected to the backup channel of the
card then the bit will be set to 1; if the highway is connected to the primary channel the
bit will be set to 0.
Valve control can only be achieved if this bit reports as a (0).
