Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 159

5 PARAMETER SETTINGS
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(2) Precautions
(a) Network type within the same network
Set all network modules within the same network to the same network type.
If there are different network types within the same network, some of the
network modules may be disconnected from the system, for example, and
normal data link is not executed.
Refer to Section 8.2.12 for details.
(b) When the MELSECNET/H Extended mode is set
When using MELSECNET/H Extended mode, use the compatible network
module and GX Developer.
For the compatible versions of the module, refer to Section 2.2.
MELSEC-Q
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