Mitsubishi Electric MELSEC iQ-R Series User Manual page 48

■Coexistence of line and star topologies
Line and star topologies can be mixed according to the availability of connection described below.
• Up to eight slave stations of authentication Class B can be connected to the transmission path from the master station to
the authentication Class B device of the end.
• When connecting authentication Class B devices, connect them from P1 or P2 of the master station.
• When connecting authentication Class A devices, connect them at the end of an authentication Class B device. In this
case, it can be connected in a star topology by using a general-purpose hub.
No.0
Class B
No.0: Master station
No.1: Slave station (1st station)
No.8: Slave station (8th station)
No.9, No.10: Remote station
Class A: Authentication Class A device
Class B: Authentication Class B device
• A connection cannot be established if the total cyclic data size of all slave stations on the authentication Class A device side
that form a boundary between authentication Class B and authentication Class A exceeds 2K bytes.
No.0
Class B
No.0: Master station
No.1, No.2: Local station
No.3, No.4, No.5, No.6, No.7, No.8, and No.9: Remote station
Class A: Authentication Class A device
Class B: Authentication Class B device
 Set the total cyclic data size within 2K bytes.
■Ring topology
In a "Mixture of Authentication Class B/A or Authentication Class A Only" system configuration, the network cannot be
configured in a ring topology.
5 SYSTEM CONFIGURATION
46
5.2 Structure of Authentication Class B/A Devices and Ethernet Devices
No.1
Class B
No.1
Class B
No.3
Class B
No.2
Class B
No.8
Class B
... ...
No.4
Class B
Ò
No.5 No.6
Class A Class A
No.9
Class A
General-
purpose hub
Ò
General-
No.7
purpose
Class A
hub
No.8
Class A
No.9
Class A
No.10
Class A