Installation guide

80 Estimating Network Performance
890 USE 100 00
3.1 1 Predicting Token Rotation Time
Figure 35 shows a graph of token timing as a function of the network
node count and message loading. The graph was constructed with a
network containing Modicon programmable controllers. Message
loading ranges from zero (the token pass only) to maximum loading
(each controller has all four MSTR Data Master paths on, with each
path passing 100 registers, and with global data passing 32 registers).
TIME
(MS.)
NODES
100
200
300
400
500
5 10 15 20 25 30
A
B
C
D
E
F
TOKEN ROTATION TIME
LEGEND
A TOKEN ONLY
B 32 REGISTERS GLOBAL DATA
C 32 REGISTERS GLOBAL DATA AND
1 DATA MASTER PATH ALWAYS ON (100 REGISTERS)
D 32 REGISTERS GLOBAL DATA AND
2 DATA MASTER PATHS ALWAYS ON (200 REGISTERS)
E 32 REGISTERS GLOBAL DATA AND
3 DATA MASTER PATHS ALWAYS ON (300 REGISTERS)
F 32 REGISTERS GLOBAL DATA AND
4 DATA MASTER PATHS ALWAYS ON (400 REGISTERS)
NO QUEUEING OR PROGRAMMING ON NETWORK
Figure 35 Token Rotation T ime