Installation guide

82 Estimating Network Performance
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3.12 Formula for Calculating Token Rotation
The formula for calculating the average token rotation time is:
TR = (2.08 + 0.016 * DMW ) * DMP + (0.19 + 0.016 * GDW ) * GDN + 0.53 * N
where:
V TR is the average token rotation time in ms
V DMW is the average number of words per Data Master path used
in the network (maximum 100 for controllers)
V DMP is the number of Data Master paths used continuously in the
network (see the two notes below)
V GDW is the average number of global data words per message used
in the network (maximum 32)
V GDN is the number of nodes with global data transmitted in the
network
V N is the number of nodes on the network
Note: When counting Data Master paths, consider the ratio between
the network’s token rotation time and the device’s scan time. The way
in which you count paths depends upon which of these two times is
the faster.