Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 77)

Chapter 8
Host Communications
8–2
NF NO FORWARD: the addressed station cannot forward the requested
information to a sub-network. It is NOT a Concentrator.
ER ERROR: the transaction command contains some form of error or
the workstation has detected an error. The remainder of the record
contains text which indicates the contents of the error.
A sampling of network status messages the Host could expect to see as this
network comes up would be:
Message Description
0101001100MO actual Master indicating it is ready
0102000000ON backbone workstation 2 online
0103000000ON backbone workstation 3 online
0104000000ON backbone workstation 4 online
0104000000CO workstation 01-04 indicating it is a Concentrator
0105000100ON tributary workstation 5 online
0105000000SO tributary workstation 5 becomes Submaster
0509000000ON tributary workstation 05-09 online
As the number of Concentrators and Submasters in a network increases,
more time is required for each of the workstations on the sub-strings to come
ONLINE. When installing very large networks with many sub-networks, it is
advisable to set up the network with all the workstations in one room, and
observe just how long it takes for the last workstations on the sub-networks
to come online.
When installing very small networks, set the upper and lower polling
addresses (in the Main Menu), such that they narrowly window the
Concentrators in the network. This will reduce time in bringing workstations
online, as the Master will not spend time polling for non-existent
workstations. For example, if a Master is connected to only 2 Concentrators,
(Concentrators #4 and #5), then set the lower poll address to 3 and the upper
poll address to 6.
Network Status Records
(cont’d)