4
Commissioning
26
Festo – P.BE-CPX-FB37-EN – 1406NH – English
4
Commissioning
4.1
General instructions
4.1.1
Switching on the power supply
Note
•
Please observe the switch-on instructions in the manual of your control system
(PLC/IPC).
If the control system and fieldbus station have separate voltage supplies, the devices must be switched
on in the following sequence:
1. Switch on the operating voltage supply of all bus stations (I/O devices).
2. The power supply for the controller.
4.1.2
Addressing, configuration and parameterisation
Addressing, configuration and parameterisation differ depending on whether the modular
device profile (MDP) or the fixed I/O size (CPX-FB38 mode) is used.
4.2
Address assignment
Note
–
In MDP the bus node automatically determines the number of inputs and outputs of
the modules installed in the CPX terminal.
–
The bus node provides the CPX terminal with an address space of up to 64 bytes for
inputs (I) and 64 bytes for outputs (O).
–
Each module of the CPX terminal occupies a certain number of I/O bits, I/O bytes or
words in the context of module communication.
–
Certain functions, such as the I/O diagnostics interface (STI), also reduce the num-
ber of available I/O bytes (in favour of status or diagnostic functions).
The address assignment within the individual CPX modules are found in the description
for the relevant CPX module.
On the basis of the CPX module type, you can ascertain the number of inputs and outputs
occupied by the CPX module.
In the CPX FMT or CPX MMI, the individual modules are displayed with the respective
module identifiers. In the I/O modules, the module indicator is depicted in the upper
region of the module besides the LEDs (for example, 8DI for a module with 8 digital in-
puts).
