Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Protocol Configuration 589
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.
Parameter Options Programming Software Default
Baud Rate 9600, 19.2K 19.2K
Node Address 1…31 decimal 1
Token Hold Factor 1…4 2
Max Node Address 1…31 31
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes