Bristol Babcock Network 3000 Setup Manual page 56

Chapter 4 - Guidelines For Configuring the BSAP Data Link
expansion, then polling for all of these non-existent or failed nodes should be
turned off using the node array. This prevents unnecessary communication
attempts by the master to a non-existent node.
In the figure, shown on the previous page, the third slave node has
been struck by lightning and so has failed. The master controller
(which contains the node array) will continue attempts to
communicate with it, until, the third element in the node array
(corresponding to address 3) is changed from ON to OFF by the
operator, as shown at right.
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For a full description of how to configure the node array , see the #NDARRAY
portion of the 'System Signals' section in the ACCOL II Reference Manual
(document# D4044).
Configuring Advanced Master Polling Parameters
(PES03, PEX03, PLS03, PLX03, LS501, RMS04, or
newer only)
Advanced users may choose to utilize certain additional parameters, which provide
greater control over Master/EAMaster Port polling. In order to use these advanced
parameters, a negative number must be entered on the #NDARRAY.. system signal.
The absolute value of this number is used to designate a signal list which will serve
as the Master Poll Control Signal List, instead of directly referencing the node
array.
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If your Master node includes Expanded Addressing Master (EAMaster) Port(s) the #NDARRAY
includes virtual nodes as well as real nodes. Also, an additional node array, similar to #NDARRAY
must be created for each virtual node, to control polling for its slave nodes. See the 'EAStatus
Module' and 'Expanded Node Addressing' sections of the ACCOL II Reference Manual (document#
D4044) for details.
Page 4-10 Network 3000 Communications Configuration Guide