AXL E ETH DIO16 M12 6M
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11 Monitoring
Monitoring functions with different features are available for
monitoring Ethernet communication.
– Modbus connection monitoring
– Process data watchdog
By default upon delivery, the process data watchdog is de-
activated.
By default upon delivery, the process data watchdog is de-
activated.
If the timeout period expires for one or both mechanisms,
the OUT process data is blocked. The parameterized substi-
tute value behavior of the outputs is performed.
The error is indicated by the NET LED (red on). During the
Net Fail state, the OUT process data can continue to be up-
dated by the application.
Following a Net Fail reset, substitute values are then re-
placed by the latest process data.
11.1 Function of the process data watchdog
A process data watchdog is integrated into the device to
avoid uncontrolled setting/resetting of outputs in the event of
an error.
If outputs are set, the controlling process must be able to ac-
cess the device.
In the event of an error, e.g., network cable interrupted or
function error in the controlling process, the device can re-
spond 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).
11.2 Net fail
If there is no triggering during the timeout period, an error oc-
curred. Two responses follow:
– All outputs are set to the configured substitute value.
–The NetFail signal is set (NET LED is red and bit1 in
status register 7996 is set).
For safety reasons, the user cannot stop the watchdog once
it has been activated.
If the user terminates the controlling application, the watch-
dog is not triggered. When the timeout period elapses, the
Net Fail signal is set, and the parameterized substitute value
behavior is performed. After the watchdog has performed its
task, the outputs are only enabled again after acknowledg-
ment.
11.3 Configuring the process data watchdog
To activate the watchdog, specify the desired
timeout period in the range of 200 ms and 65,000 ms.
In order to deactivate the watchdog, specify the 0 ms time-
out period.
You have the following options for changing the timeout pe-
riod:
– Web-based management
– Modbus register 2000
Mechanism Monitoring
Modbus connection
monitoring
Client application
Modbus channels
Ethernet connection
Process data watchdog Client application
Ethernet connection
Process data exchange
By default upon delivery, the process data
watchdog is deactivated; timeout period = 0
ms.
Reading calls do not trigger the process data
watchdog.
When the error is acknowledged, the watch-
dog is restarted. This means that it must be
triggered during the timeout period, otherwise
an error is detected again.
