Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM User Manual
Page 170
Publication AG-UM008C-EN-P - February 2005
4-32 Configuring SLC 5/03, 5/04, and 5/05 Processors
Figure 4.4 Applying DF1 Radio Modem Protocol
Figure 4.5 Store & Forward Table for Node 2
Node 4
No Bits
Node 3
1, 2, 4
Node 2
1, 3, 4
Node 1
No Bits
CMD 1
(DST = 4, SRC = 1)
REPLY 1
(DST = 1, SRC = 4)
CMD1
(1st Rebroadcast)
Note 1
(2nd Rebroadcast)
REPLY 1
CMD 1
(2nd Rebroadcast)
(1st Rebroadcast)
REPLY 1
Note 4
Note 2
Note 1 – The link layer of Node 1 blocks the re-transmission of a packet that is received with the SRC byte equal to the
receiving node’s station address. Packets received that originate from the receiving node should never be re-transmitted.
Note 2 – To prevent Node 2 from re-transmitting a duplicate packet, the link layer of Node 2 updates the duplicate packet
table with the last 20 packets received.
Note 3 – The link layer of Node 4 blocks the re-transmission of a packet that is received with the SRC byte equal to the
receiving node’s station address. Packets received that originate from the receiving node should never be re-transmitted.
Note 4 – To prevent Node 3 from re-transmitting a duplicate packet, the link layer of Node 3 updates the duplicate packet
table with the last 20 packets received.
Note 3