8
PROFINET IO configuration
PROFINET IO configuration with topology detection
Manual – PROFINET IO Interfaces, Field Distributors
100
8.6.2
Fieldbus timeout
WARNING
Risk of crushing if the drive starts up automatically.
Severe or fatal injuries.
•
The error "fieldbus timeout" resets itself. The drives get the current process out-
put data from the control straight away after fieldbus communication restarts.
•
If, for safety reasons, this is not permitted for the driven machine, disconnect the
device from the supply system before you start troubleshooting.
Switching off the fieldbus master or an open circuit in the fieldbus cabling results in a
fieldbus timeout in the MFE fieldbus interface. The "BUS-F" LED lights up to signal
that no new user data is being received. The MOVIMOT
®
drives perform a rapid stop.
All drives connected to the MFE fieldbus interface are stopped. In addition, the digital
outputs are set to "0".
8.7
PROFINET IO configuration with topology detection
8.7.1
Introduction
The PROFINET IO technology detection makes it possible to configure and monitor
the structure of the network with the PROFINET IO controller in addition to the
PROFINET IO devices.
The so-called "Physical device (PHDEV)" is the starting point for configuration. PDEV
is a model for the Ethernet interface and can be found in slot 0 in the configuration
with an "Ethernet interface" subslot and one subslot for each Ethernet port.
The Ethernet ports made visible in this way can be connected to the configuration tool.
The result is an image of the desired Ethernet routing for the plant. This image is
stored in the PROFINET IO controller.
To determine the real plant topology, the PROFINET IO devices must support the so-
called LLDP (Link Layer Discovery Protocol). The PROFINET IO devices exchange in-
formation with the neighboring PROFINET IO devices via LLDP. Via LLDP, each
PROFINET IO device cyclically sends information using its own PROFINET IO device
name and port number. The neighboring device receives and stores this information.
Now, a PROFINET IO controller can read the stored information from the PROFINET
IO devices and determine the real plant topology.
By comparing the configured topology with the real topology, you can detect any miss-
ing or incorrectly wired PROFINET IO devices and localize them in the plant.
Apart from cabling you can still determine the transmission characteristics for the
ports. For example, you can set an "Auto-negotiation" port to "100 Mbit full duplex".
The settings will be monitored.
SNMP as a protocol for network diagnostics extends the topology detection by stand-
ard diagnostics mechanisms from the IT area.
22870857/EN – 12/2016
