Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 67)

Chapter 6
Operating Procedures
6–4
If the network is not operating, then adding a new Master to the system
involves the following steps:
1. Disconnect the cables from the ‘old’ Master
2. Remove the ‘old’ Master
3. Attach cables to the new workstation
4. Configure the new workstation as a Master (see Configuration Menu)
5. Set the communications parameters from the list in your site parameter
list for a Master (see Communications Menu)
Before becoming active, the new Master will wait for a moment to make sure
that no other workstation is currently acting as Master. During this time,
when 1–Network Status is entered, the Master will display:
nn READY
OFFLINE [M]
As soon as the new Master comes online, it’s display will change to:
cc–nn READY
ONLINE [M]
where cc is the Concentrator or Master number, and nn is this workstation’s
number.
Note: Under polled mode the Master Workstation will not actually go online
until it receives a poll from the Host.
When a workstation is removed from the network, or it becomes inoperable
for whatever reason, there may be approximately a 2 second pause in
network operations. This occurs because the Master makes multiple attempts
to get data from the (now) absent workstation before it stops trying.
When several workstations are removed from the network at the same time,
the pause will be 2 seconds x number of workstations removed.
Instituting a New
Workstation as Master
Removing a Workstation
from the Network