Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 209)

Publication 1747-UM011G-EN-P - June 2008
RS-232 Communication Interface 209
DF1 Radio Modem System Limitations
The following questions need to be answered in order to determine if
you can implement the new DF1 radio modem driver in your radio
modem network.
• Are all of the devices SLC 5/03, 5/04 or 5/05 processors?
If so, then they must all be at operating system FRN C/6 or later
in order to be configured with the DF1 radio modem driver
using RSLogix 500 version 5.50 or later software. If not, then
make sure that all of the nodes can support the DF1 radio
modem protocol. Once channel 0 is configured for DF1 radio
modem, you will need to use channel 1 to locally monitor and
program your SLC processor using RSLogix 500 software.
• Does each node receive the radio transmissions of every other
node, being both within radio transmission/reception range and
on a common receiving frequency (either via a Simplex radio
mode or via a single, common, full-duplex repeater)?
If so, then go to the next question to see if you can use the DF1
radio modem driver to set up a peer-to-peer radio network. If
not, then you may still be able to use the DF1 radio modem
driver, but only if you limit MSG instruction initiation to the
node connected to the master radio modem whose
transmissions can be received by every other radio modem in
the network.
• Do the radio modems handle full-duplex data port buffering and
radio transmission collision avoidance?
If so, and the answer to the previous question is yes as well,
then you can take full advantage of the peer-to-peer message
initiation capability in every node (for example, the ladder logic
in any node can trigger a MSG instruction to any other node at
any time). If not, then you may still be able to use the DF1 radio
modem driver, but only if you limit MSG instruction initiation to
a single master node whose transmission can be received by
every other node.
• Can I take advantage of the SLC 5/03, SLC 5/04, and 5/05
channel-to-channel passthru to remotely program the other SLC
nodes using RSLinx and RSLogix 500 running on a personal
computer connected to a local SLC processor via DH-485, DH+,
or Ethernet?
Yes, with certain limitations imposed based on the radio modem
network.