Festo CPX-FB38, Electronic Manual

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2. Commissioning
2−4
Festo P.BE−CPX−FB38−EN en 0804NH
2.2 Address assignment
Please note
The address space of a CPX terminal in the EtherCAT
network is limited.
The CPX bus node for EtherCAT provides the CPX terminal
with an address space of up to 64 bytes for inputs (I) and
64bytes for outputs (O).
Each module of the CPX terminal occupies a certain
number of I/O bits, bytes or words in the context of
module communication.
Please refer to Tab.2/1 to Tab.2/6 for the number of I/O
bytes occupied (of the respective module).
Also, certain functions, e.g. the I/O diagnostics interface
(STI), reduce thenumber of available I/O bytes (in favour
of status or diagnostics functions).
Take account of this fact for the planning of your
CPXterminal.
Before starting up or configuring the CPX terminal, determine
the number of assigned inputs and outputs. Tab.2/7 pro
vides help with this.
Use the configuration documents, the handheld control unit
(CPX−MMI) or the Festo Maintenance Tool (CPX−FMT) to
determine address assignment or terminal set−up.
In the handheld control unit, the individual modules of the
CPX terminal are displayed with the respective module ident
ifiers. Using the module identifier and the following tables,
you can determine the module type and, with it, the number
of inputs and outputs occupied by the module.