Df1 Radio Modem Support - Allen-Bradley 1769 User Manual
Compactlogix
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- Installation instructions manual (12 pages) ,
- Instruction manual (676 pages) ,
- Reference manual (561 pages)
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DF1 Radio Modem Support
Your ControlLogix controller includes a driver that lets it to communicate over
the DF1 Radio Modem protocol. This driver implements a protocol, optimized
for use with radio modem networks, that is a hybrid between DF1 full-duplex
protocol and DF1 half-duplex protocol, and therefore is not compatible with
either of these protocols.
The DF1 radio modem driver should be used only among devices that support and are configured
IMPORTANT
for the DF1 radio modem protocol.
Additionally, there are some radio modem network configurations that will not work with the
DF1 radio modem driver. In these configurations, continue to use DF1 half-duplex protocol.
Like DF1 full-duplex protocol, DF1 radio modem lets any node to connect 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, a node ignores any packets received that have a destination
address other than its own, with the exception of broadcast packets and
pass-through packets.
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
assured by the CRC checksum.
Using the DF1 Radio Modem Driver
The DF1 radio modem driver can be configured as the system mode driver by
using RSLogix 5000 programming software, version 17 or later.
To configure the controller for DF1 Radio Modem communication, perform this
procedure.
Rockwell Automation Publication 1769-UM011H-EN-P - April 2012
Communicate over Networks
Chapter 4
61
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