Festo CPV GE-ASI-8E8A-Z M8 Serie Instructions D'utilisation page 23

Only slave 1 can be uncoupled" from the AS−Interface
bus with the address selector button.
If both slaves are coupled" to the AS−Interface bus,
the addressing device can only access reliably the
lower slave address. Only if slave 1 is uncoupled, can
access also be made to a higher slave address of
slave 2. If slave 1 has the address #0, slave 2 is
deactivated.
If by mistake the address #31 is assigned to slave 1,
this address can no longer be modified, because ac
cess can then only be made to slave 2 with the lower
address.
Example:
Old addresses: slave 1: #5; slave 2: #4:
slave 2 } #31, slave1 } #3, press button,
slave 2 } #2, press button, address modified
3.4 Address assignment of the valves
When addressed, the valve terminal type CPV−..−GE−
ASI−8E8A−Z M8 behaves like two individual slaves each
with 4 inputs and 4 outputs (see 3.1).
Both valve terminal halves can be fitted with equipment as
follows:
Festo CPV..−GE−ASI−8E8A−Z M8 0306c English 23