Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Protocol Configuration 605
Like DF1 Full-Duplex protocol, DF1 Radio Modem allows any node to
initiate to any other node at any time (if the radio modem network
supports full-duplex data port buffering and radio transmission collision
avoidance). Like DF1 Half-Duplex protocol, up to 255 devices are
supported, with unique addresses from 0…254. A node ignores any
packets received that have a destination address other than its own, with
the exception of broadcast packets. A broadcast write command initiated
by any DF1 radio modem node is executed by all of the other DF1 radio
modem nodes that receive it. No acknowledgement or reply is returned.
Unlike either DF1 Full-Duplex or DF1 Half-Duplex protocols, DF1 Radio
Modem protocol does not include ACKs, NAKs, ENQs, or poll packets.
Data integrity is ensured by the CRC checksum.
Using the DF1 Radio Modem
Using RSLogix 500/RSLogix Micro version 7.00.00 or higher, the DF1
Radio Modem driver can be configured as the system mode driver for
Channel 0 in MicroLogix 1400.
Channel configuration appears as follows. Figure shows Channel 0
configuration.
DF1 Radio Modem Channel 0 Configuration (MicroLogix 1400)
When the system driver is DF1 Radio Modem, the following parameters
can be changed for Channel 0.
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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