PATLITE NHL - Manual (Page 37)

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3.10 Application Monitoring Function
By creating an additional transmission command for a customer's application, this product can monitor the
response of the application by receiving the data from it.
If data is not received within the monitoring period, it makes a judgement that the communication has become
abnormal, and at the time of the abnormality, sends a status change to the Signal Tower. After a generated
event, if data is received from the monitored candidate, it will detect a recovery from the abnormal operation.
Refer to "4.11 Application Monitoring Configuration Screen" for details on the setting method.
As an example, with a monitoring period of 30 seconds, the received data from the application is monitored.
1. After the setup is complete and it receives data from the address monitoring point, the monitoring will
commence.
2. If data is received within the monitoring period of 30 seconds, it will be judged as having no abnormalities.
3. However, if the data is not able to be received within the allotted period (30 seconds in this example), it
makes a judgment of abnormality.
Once judged as abnormal, the operation at the time of the detected abnormality is carried out.
4. If data is received from the application after detecting a generated event of abnormality, it will detect a
recovery from the abnormality.
The operation at the time of recovery from the abnormal condition will return to its monitoring condition
again.
Fig. 3.10.1 Detailed Example of Application Monitoring
Application Monitor
Side
Application Monitor
re-start
Application
Monitoring Period
Application Monitoring
lapsed time reset
When data couldn't be
received during a
monitor reception period
Application Monitoring
abnormal detection start
Monitoring Condition
Data
Transmission
Data
Response
Application Monitoring Period
Monitor Starting
Point
Monitoring Abnormal Condition Monitoring Condition
When data was received
during the detection of an
abnormality
Application Monitor
Recovery Start Execution
Application Monitoring Period
Application Monitoring
Condition
NHL Side
Recovery from an abnormal operation can only occur if a monitored condition was
detected as abnormal.
Please