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(b) Standard communication
• Periodic communication (cyclic transmission)
Data is periodically communicated among stations within the same network. ( Page 102, Section 8.2)
• Non-periodic communication (transient transmission)
Data is communicated upon request. ( Page 117, Section 8.3)
Master
station
(standard station)
CPU module
X
Y
W
RX
RY
RWw
RWr
Local station
(safety station)
Safety
CPU module
Y
X
W
RY
RX
RWr
RWw
RX
RY
RWw
RWr
RX
RY
RWw
RWr
Intelligent
device station
Intelligent
device station
Master station
(standard station)
Local station
(safety station)
Local station
(safety station)
Safety
CPU module
Y
X
W
RY
RX
RWr
RWw
Local station
(safety station)
Intelligent
device station
Intelligent
device station
Command
Instruction
Device
1234
H
Device
1234
H
Safety
CPU module
Safety
CPU module
Master station
(safety station)
Local station
(safety station)
Response
data
Read
request