H D 2 - D M - A / D M - A M
Operation with the Diagnostic Manager
Subject to reasonable modifications due to technical advances.
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8.5.5
PROFIBUS Field Device Measurement Handling
A PROFIBUS device can take two different states:
•
in Data Exchange and
•
not in Data Exchange.
If at least one PROFIBUS Device is in Data Exchange, the measure-
ment takes place exclusively for PROFIBUS masters and devices which
are in Data Exchange only. All other devices are disabled for the mea-
surement (shown by red letters and disabled activity status checkbox).
To analyze PROFIBUS devices which are not in Data Exchange use the
Oscilloscope function (see chapter 8.7) and perform the „trigger events“
request to address or response from address.
In the case that multiple segments are linked together via a common
backplane, monitoring would be expanded to the other segments too,
like in a PROFIBUS PA segment coupler SK2 application.
The "Measured configured Field Device only" check box allows to enter
the addresses of those field devices only that are physically connected
to the monitored segment.
•
8.5.6
Failure and Maintenance Alarm Handling
The Diagnostic Manager provides two different physical layer alarm cat-
egories:
•
Maintenance alarms
•
Out of Specification alarms
You can adjust the Maintenance alarms (in white table cells). All main-
tenance alarm limits can be adapted to the specific requirements of
each segment. For each Physical Layer value, minimum and maximum
limits can be set and activated, if the value violates the limit a mainte-
nance alarm will be released at the Diagnostic Manager and via OPC
interface at the operator application. By means of this proactive diagno-
sis, error sources can be found before communication fails.
Out of specification alarm limit values (in grey table cells) are derived
from the IEC 61158-2 standard, they can be switched on and off but can
not be adjusted by the user. If these limits are violated there is an in-
creased risk of communication failure.
Both alarms are indicated as follows:
