Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
Protocol Configuration 503
DH-485 Broadcast Messages
A broadcast write command is sent as a DH-485 Send Data No
Acknowledgement (SDN) packet. No acknowledgement or reply is
returned.
DH-485 Configuration Parameters
When communications are configured for DH-485, the following
parameters can be changed:
The major software issues you need to resolve before installing a network
are discussed in the following sections.
Software Considerations
Software considerations include the configuration of the network and the
parameters that can be set to the specific requirements of the network.
The following are major configuration factors that have a significant effect
on network performance:
• number of nodes on the network
• addresses of those nodes
• baud rate
The following sections explain network considerations and describe ways
to select parameters for optimum network performance (speed). Refer to
your programming software’s documentation for more information.
Number of Nodes
The number of nodes on the network directly affects the data transfer
time between nodes. Unnecessary nodes (such as a second programming
terminal that is not being used) slow the data transfer rate. The maximum
number of nodes on the network is 32.
Parameter Options Programming Software Default
Baud Rate 9600, 19.2K 19.2K
Node Address 1 to 31 decimal 1
Token Hold Factor 1 to 4 2
Max Node Address 1 to 31 31
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English