6 - 3 6 - 3
MELSEC-Q
6 COMMUNICATION TIME
(2) Bus cycle time when there are multiple master stations
Following is an explanation of the bus cycle time when multiple masters are
connected to the same network. The following diagram (Fig. 6.2) shows when 2
masters are connected to the same network. Bc(1) and Bc(2) in the following
diagram (Fig. 6.2) are the master 1 and master 2 bus cycle times respectively,
and their total time is calculated using the formula presented in Section 6.1.
Master 1 executes polling
Master 2 executes polling
Master 1 executes polling
Time
Master 1 bus cycle time Bc(1)
Master 2 bus cycle time Bc(2)
TBC
Fig. 6.2 The Bus Cycle time when multiple masters are connected
As shown in this diagram, each master total bus cycle time is calculated as:
Number of the master stations
TBc = Bc (n)
n = 1
