Festo CPX DE Series Manual page 126

4. Digital CPX multi I/O modules
4−8
Sockets X1 to X4 are designed for connecting cylinder−valve
combinations type DNCV with connecting cable type
KM12−8GD8GS−2−PU.
Please note
Inputs Ix+4 and Ix+6 are provided both at pin 7 of sockets
X1 and X2 as well as at pin 2 of sockets X3 and X4.
The cylinder−valve combination type DNCV with diagnostic
module and activated diagnostic output supplies an in
verted diagnostic signal (1−signal = no fault) at pin 7.
When therefore cylinder−valve combinations type DNCV
with diagnostic module and activated diagnostic output
are connected to sockets X1 and X2, pin 2 at sockets X3
and X4 cannot be used.
Festo P.BE−CPX−EA−EN en 0804g