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12-20-2002
Figure Sheet 1-853-A
Page 16
In the example diagram (Figure 2-1), there is real-time data on D1 and 16 multiplexed data words on
D5. D1 contains the Edge Left Sensor value from a CDP-01. D5 is used to send 16 different values
from the CDP-01. For the real-time value, the CDP-01 sends the Edge Left Sensor value in D1 every
cycle. For the multiplexed time slice, the CDP-01 sends the Edge Right Sensor value in D5 during
time T0. During time T1, D5 contains the Line Edge Sensor value.
As you can see in the example on the previous page, 17 values are being sent over FifeNet, but only
two time slices of network bandwidth are used. The 16 values in time slice 5 are updated at a slower
rate than the value in time slice 1. The application dictates which method should be implemented.
FifeNet Master
The FifeNet protocol uses the time slice architecture described previously for configurable network
traffic. Without some synchronization, however, neither the SBPC-21-EN/IP, nor the CDP-01, would
know where the time slice boundaries were located. This would create problems when they are trying
to send and receive data. This is one of the primary functions of the FifeNet Master, in this case, that
would be the SBPC-21-EN/IP.
