Stober SD6 - Monitoring and Diagnostics; Connection Monitoring; States of the Bus Communication

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6
Operation manual PROFINET
6.5 Monitoring and diagnostics
6.5.1 Connection monitoring
To prevent the drive reacting in an undesirable manner when the PROFINET
connection is interrupted (cable break, etc.), the arrival of the cyclic process
data should be monitored.
PROFINET provides a Response monitoring time for the connection
monitoring that defines the so-called IO cycle together with the Update time. 
The update time determines the time interval in which the data is transferred
from an IO controller to the relevant IO device (outputs) and vice versa (inputs).
Among other things, it depends on the data volume to be transferred and is
generally automatically calculated in the TIA Portal for each IO device (see
5.2.4 Configure IO controller).
The response monitoring time corresponds to the number of permitted cycles
without data transfer.
In addition to the response monitoring time, the A109 PZD timeout parameter
can be activated in the DriveControlSuite. If the timeout is activated, the drive
controller behaves in the event of an error as follows:
After an error has occurred, the defined response monitoring time first elapses
than the timeout defined in A109 starts.
When this time elapses, the drive controller changes to the Fault device state
and shows the 52:Communication event with the 4:PZD timeout cause on the
display.
Note that the event from this time is triggered cyclically until the cause is
rectified. The cycle does not depend on the time of the acknowledgement.
6.5.2 States of the bus communication
The PN6 communication module is equipped with a green RUN LED and a red
ERROR LED that visualize the connection to the controller and the state of the
data transfer.
In addition each of the two RJ-45 sockets has two integrated diodes – Link
(green) and Act (orange) – that report the connection and communication
status as viewed by the hardware.
Detailed information about the state of the bus communication can be taken
from the A271 PN state or A278[5] – A278[8] PN diagnostics parameter if
necessary.