Festo CPX-M-FB20 Manual page 17

1. Installation
1.1 Fibre optic cable (FOC) connection
Festo P.BE-CPX-FB20/21-EN en 1202a
We recommend fibre optic cable technology for transmission
in environments subjected to heavy interference, as well as
for extending the range when high transmission speeds are
used.
This has the added advantage of high electromagnetic resist-
ance to interference due to the optical transmission of the
signals.
1-3