FieldServer Metasys N2 FS-8700-19 - Manual (Page 22)

FS-8700-19_Metasys_N2 Driver Manual Page 22 of 51
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Appendix B. Troubleshooting tips
Appendix B.1. Connection Tips & Hints
When using the FieldServer as an N2 Client, make very sure that it is the only Client /
master on the N2 network. If there is another Client on the network there will be
communication conflicts. These will be reflected on the FieldServer as protocol errors.
Appendix B.2. Offline Behavior
When the Client node on the FieldServer goes offline, the corresponding data objects on the
FieldServer are also marked offline. If a client polls a virtual FieldServer node for this
particular data, therefore, an offline response will be returned by the FieldServer. A request
from an master device for a FieldServer to identify itself would be met by a valid response,
however. This could lead to confusion and status toggling. This can be addressed using
Responsible Map Descriptors and by configuring the virtual FieldServer using the
Offline_Method option. Please refer to the Configuration Manual for further information.
Appendix B.3. Tip on Overrides
It is important that there be only one device (including the slave device itself) updating a
point which is in overridden mode. The reason for this is that the value of the point could be
changed by an update from a non-Metasys Server before the override is released by the
Metasys Master. In this case, the FieldServer would respond to a poll from the Master with
this changed data.