Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 60)

I/O Communication
Chapter 3
3-12
Figure 3.8
Example Configuration for a PeerĆtoĆPeer Communication Channel
PeerĆtoĆPeer
Communication
Channel
PeerĆtoĆPeer
Communication
Channels
PeerĆtoĆPeer
Communication
Channel
I/O
Channels
I/O
Channel
I/O
Channels
Note: All PeerĆtoĆPeer and I/O Channels connect to the
Terminal Swing Arm of the Scanner Module as shown in Figure 1.11.
Processor A
(Master)
Processor B
(Slave)
Processor C
(Slave)
PeerĆtoĆPeer
Communication
Channel A
PeerĆtoĆPeer
Communication
Channel A
10741
To calculate the time required to send 200 words from the master to both
slaves and have 200 words returned from each slave, use the following
procedure:
1. 400 words (Two 200-word output files in master)
400 words (One 200-word output file in each slave)
800 words/16 and rounding up = 50.
2. All the scanners used for peer-to-peer communication channel A have
4 active channels.
3. From Table 3.C, the nominal peer-to-peer time for 4 active channels
and a communication rate of 115.2k is 10.5ms.
4. Update time = 10.5ms x 50 = 525ms.