Allen-Bradley controllogix 1756-L55M12, User Manual

Page: 40 / 142

Publication 1756-UM001G-EN-P - January 2007
40 Communicate over Networks
Click the System Protocol tab.
5. Specify system protocol settings.
The station address specifies the node address of the controller
on the DH-485 network.
a. From the Station Address pull-down menu, choose a station
address number from 1...31, decimal.
To optimize network performance, assign station addresses in
sequential order.
Assign initiators, such as personal computers, the lowest
station address numbers to minimize the time required to
initialize the network.
The maximum station address specifies the maximum node
address of all the devices on the DH-485 network.
b. From the Max Station Address pull-down menu, choose a
maximum station address number from 1...31, decimal.
To optimize network performance, make sure:
•
the maximum station address is the highest node number
being used on the network.
•
that all the devices on the same DH-485 network have the
same selection for the maximum station address.
The token hold factor is the number of transmissions (plus
retries) that an address holding a token can send onto the data
link each time that it receives the token.