Attributes Section 3 Features
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3.2.3 Device attributes
The device attribute section contains the following information:
Table 3-4: Device attributes
Object status
Integer
Communication status of the line, see
on page 57 for status codes values and
explanations.
In use
Integer
Controls whether the SPA OPC Server tries to
communicate with the SPA devices configured
to the line. When the SPA line is taken into use
(In use set to value 1), the SPA OPC Server
tries to establish communication with the
devices configured to the line. When the SPA
line is taken out of use (In use set to value 0),
the SPA OPC Server suspends all
communication on that line.
Diagnostic counters
Description
Process data messages received
Incremented every time a message containing
process data is received from the device.
Event messages received
Incremented every time a message containing
an
event is received from the device.
Suspensions
Incremented every time the communication with
the SPA device is broken and the device is
considered suspended.
Reply timeouts
This counter is Incremented every time a
command to the device is not responded within
a configured time.
Event to data discrepancies
Incremented every time a discrepancy is
detected between the process data received
with data poll and the data received with an
event. This can be due to a configuration error
or an event overflow situation.
