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P R O F I B U S P
O W E R
Channel Diagnostics returns specific diagnostic information about each
individual segment. These error messages are prioritized and set to
preferred by the BIS depending on their ranking. The following table re-
presents diagnostic information according to its ranking.
Channel Diagnostic parameters
Hardware Error
No slave in live list
DP Watchdog time too short
Duplicate slave address
PA master not in token ring
ADM: segment out of specification
ADM: segment maintenance required
The RedState Block is a standardized diagnostic block, it is inserted
when the slave receives a PRM command.
6.2
Coupled Slaves
This section applies to coupled slaves on non-redundant Masters and
to Flying Redundancy Masters.
All coupled PA slaves behave as non-redundant DP slaves after the
GSD conversion, so that every PA slave appears directly on the DP bus.
The PA slaves are not merged to one single slave.
Both cyclic and acyclic communication is coupled.
As many C2 connections are coupled to the slaves as they support, al-
together a maximum of 500.
From the Master's point of view, redundancy switching of the Gateway
has no effect on PA slaves. They do not drop out of communication.
The FREEZE and SYNC modes are coupled, but because DP commu-
nication and PA communication are incompatible in terms of time, they
are not relevant for practical purposes.
Identification & Maintenance (I&M) Functions are supported.
6.3
Acyclic Data Exchange with BIS via DTM
The BIS supports four acyclic connections. Three dialogs are available
in acyclic mode via the DTM (Device Type Manager):
•
the Offline Dialog
•
the Online Dialog
•
the Diagnostics Dialog
Subject to reasonable modifications due to technical advances.
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