IO-Link master
40
An incoming alarm informs the Profibus device that diagnostic information has
been entered� When the diagnostic information has been removed, an outgoing
alarm is sent to the device�
If at least one piece of diagnostic information is stored, the SF LED is on� If no
diagnostic information is present, the SF LED is off�
The following Profibus diagnostic messages are indicated by the Profibus device:
●
Overtemperature of the device
●
Overvoltage of U
S
●
Overload of U
S
●
Overvoltage of U
A
●
Undervoltage of U
A
●
Short circuit of U
A
●
Short circuit of an output or output overload
●
Cable break at IO-Link port n
22 IO-Link master
IO-Link is an internationally standardised I/O technology (IEC 61131-9) for
communicating with sensors and actuators� An IO-Link master is integrated in the
Profibus device� The IO-Link master establishes the connection between the IO-
Link devices and the automation system�
The device supports the IO-Link specification v1�1 monitoring�
A process data watchdog is integrated into the device to avoid uncontrolled
setting/resetting of outputs in the event of an error� If device outputs are set, the
controlling process must be able to access the device�
In the event of an error, e�g�, bus cable interrupted or function error in the
controlling process, the device can respond appropriately via the process data
watchdog�
When activating the process data watchdog, it is started by the first write process
and the next write process is expected within the timeout period� During error-
free operation, the write process is performed during the timeout period and the
watchdog is restarted (triggered)�
Reading calls do not trigger the process data watchdog�
If there is no triggering during the timeout period, an error occurred� Two
responses follow:
– All outputs are set to the configured substitute value�
– The BF LED indicates the corresponding state�