Bus Node Operating Modes; Remote I/O Operating Mode - Festo CPX-FB33 Manual

B. Glossary
B.1

Bus node operating modes

B.1.1 Remote I/O operating mode
PROFINET RT/IRT
(in both operating modes)
Festo P.BE-CPX-PNIO-EN en 1407c English
All functions of the CPX terminal are controlled directly by the
PROFINET-IO controller or a higher-level PLC:
– control of the CPX terminal (or of the CPX valve terminal:
also designated I/O control)
– Data exchange between controller and modules
– Parameterisation of the modules
– Diagnostics.
Controller and CPX terminal communicate via PROFINET. In
doing so, the bus node takes over the connection to
PROFINET and processing of the data exchange:
– protocol implementation
– forwarding of incoming and outgoing data.
The PROFINET real-time protocol (RT) or the PROFINET
isochronous real-time protocol (IRT) is used.
A CPX-CEC control block or CPX-FEC possibly integrated into
the CPX terminal works as a passive module, i.e. without con-
trol function. In this case, the control block may be used to
connect other networks: The control block takes over for-
warding of incoming and outgoing data and thus behaves like
an I/O module.
B-3