Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 242

7 APPLICATION FUNCTIONS
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(2) Transient transmission range
In a multiple network system of the MELSECNET/H, communication can be
performed with stations in a maximum of eight networks by setting the routing
parameters described in Section 7.4.2.
The following figure illustrates the transient transmission range using an example
where the destinations are limited to eight networks.
POINT
(1) Since only one network module can be installed with the Basic model QCPU,
Q00UJCPU, Q00UCPU, Q01UCPU, and safety CPU, it cannot be used as a
relay station.
(2) For access via a redundant system, the routing parameters of the request
source or relay station(s) must be changed with the RTWRITE instruction if
system switching occurs in the redundant system.
For details, refer to Section 7.10.8.
MELSEC-Q
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