Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 42)

3Ć4
At powerĆup, the master polls all the slave drops to determine which
drops are active on the network and sets the appropriate bits in its
status registers. The master initiates all transmissions on the network.
During a communication cycle, the master will begin transmitting
data to each active drop on the network in sequence. In figure 3.2,
the master will transmit its broadcast registers and registers 32 to 63
of its drop 1 area. This packet of data is sent simultaneously to all
active drops on the network. In other words, the broadcast registers
in the drop 0 area and the second 32 registers in the drop 1 area on
both slave Network modules will be updated with this transmission.
See figure 3.2.
DROP 0
0Ć31
32Ć39
DROP 1
0Ć31
32Ć63
DROP 2
0Ć31
32Ć63
DROP 3
0Ć31
32Ć63
DROP N
0Ć31
32Ć63
AutoMax
PROCES
SOR
DROP 0
0Ć31
32Ć39
DROP 1
0Ć31
32Ć63
DROP 2
0Ć31
32Ć63
DROP 3
0Ć31
32Ć63
DROP N
0Ć31
32Ć63
AuotMax
PROCES
SOR
MASTER RACK
DROP 00
DROP 02
DEPTH = 2
DROP 0
0Ć31
32Ć39
DROP 1
0Ć31
32Ć63
DROP 2
0Ć31
32Ć63
DROP 3
0Ć31
32Ć63
DROP N
0Ć31
32Ć63
AutoMax
PROCES
SOR
DROP 01
DEPTH = 1
NETWORK COMMUNICA
TIONS MODULE
NETWORK COMMUNICA
TIONS
NETWORK COMMUNICA
TIONS MODULE
MODULE
Figure 3.2 Ć Master Initiates Transmission