Festo CPX Electronic Manual page 50

2. Fitting
2−6
Rules for assembly
A maximum of 10 electric modules including the field bus
node plus a pneumatic interface are permitted on the
electrical side.
For MPA pneumatics:
The MPA pneumatic interface does not count as an elec
tric module. Instead, the individual MPA pneumatic mod
ules each represent an electric module with digital out
puts for triggering the integrated valves. A maximum of
8 MPA pneumatic modules are permissible.
Except for the pneumatic interface, each electric module
including the field bus node can be fitted in any position
on the electrical side.
The electric modules can be arranged in any sequence in the
CPX terminal. Depending on the field bus protocol used, it
may however be sensible to arrange modules of the same
type one after the other. In these cases, the address assign
ment and therefore communication between the field bus
master and the individual CPX terminals can be optimised.
The pneumatic interface must be placed on the right−hand
side as the last electric module.
Sub−bases can be used universally for field bus nodes
and I/O modules.
If sub−bases with additional supply are not required, the
manifold sub−base with the system supply can be fitted in
any desired position.
If manifold sub−bases with additional supply are required,
these must always be placed to the right of the system
supply (see also section 1.1.3).
Sub−bases can be used universally for the different I/O
modules.
Festo P.BE−CPX−SYS−EN en 0503b