Panasonic MEWNET-F Technical Manual page 16

The following systems cannot be configured.
A remote I/O system cannot be configured with a master unit installed in the I/O slot of the bakcplane
where a slave unit is installed.
A MEWNET network cannot be configured with a link unit installed in the I/O slot of the bakcplane where
a slave unit is installed.
The inttrupt program cannot be executed from the slave stations.
Communication with external devices cannot be achieved with a communication unit using MEWTOCOL
(communication protocol) installed in the I/O slot of the bakcplane where a slave unit is installed.
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