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One of the standard features provided by every eWON industrial router is alarm notification. This can of course be used in a factory or plant for monitoring specific automation devices and sending alarm notifications to a supervisor when an event occurs. However, it can also be used outside the factory or plant, in the field, to monitor assets or devices remotely and send notifications to anyone. It is designed so that it can be used with every configured tag, which means that since an eWON industrial router can hold an average of 350 tags, more than 350 notifications can be issued, individually and independently.
Surveillance in an infrastructure network or an industrial system implies a system that automatically issues alarms so that action can be taken to avoid damage or failure. This application note describes how eWON technology can provide an alarm notification system that can quickly be configured and deployed to monitor up to 350 tags and generate alarms for each of these tags.
In this scenario, the eWON industrial router acts primarily as a fault indication unit, while still enabling remote access for acknowledgment, control and monitoring as a secondary function.
The eWON industrial router has an internal tags database. Each tag represents a value acquired by the eWON unit from a connected device (primarily PLCs) via its serial or Ethernet port.
Using the eWON configuration web pages (HMI), the user can configure four alarm thresholds for each tag. The user can also define a dead band and a trigger delay in order to avoid hysteresis effects or unwanted alarms.
Once configured, the eWON industrial router is able to issue notifications automatically to several recipients using its embedded modem:
The text message always contains the tag concerned and its value. An additional message can be configured to appear at the beginning of the text message. Text messages and e-mail messages can be used in combination, since the related file, such as the event log or data log, can be attached to an email message to provide more information to the recipient.
Besides e-mail and text messaging, the eWON industrial router offers two additional channels for sending notifications:
Alarms can be acknowledged automatically or via the eWON website by authenticated users, who can acknowledge alarms and check the real-time alarm table after logging in.
* In some countries, text messages can be sent using a PSTN modem as well as a GSM (mobile/cellular telephone) modem
Practical aspects of alarm notification
GSM numbers have to be configured in the internal memory of the eWON units, which does not provide the flexibility necessary for managing the people – technicians and engineers – who must respond to alarm notifications. They may sometimes be unavailable due to illness, or they may be replaced, and nobody wants to have to reconfigure every eWON unit in the field whenever it is necessary to change the phone number of a notification recipient.
One solution is to provide several mobile phones that can be shared by the people on alarm notification duty. The team members must hand over these mobile phones to the other team members as necessary.
Another solution is to interface the eWON industrial routers with a dedicated alarm manager program. In this scenario, the eWON industrial routers can be configured to send alarm notifications to any desired alarm manager program, which relays them to the people on alarm notification duty. As this program only has to be installed once in a central location, it is easier to update the list of alarm recipients and the associated mobile phone numbers managed by the program.
This program also allows alarms to be cascaded, which is the functionality to allow recipients to receive eWON notifications in escalation situations.
Featured products
Alarm notification capability is a standard feature of all eWON product lines.
The eWON 2101CD industrial router is the entry-level product for this type of application. It provides a modem and an Ethernet-to-serial gateway for connecting a wide range of industrial devices using various communication protocols. The eWON 2101CD industrial router has the following modem options:
The eWON industrial router provides alarm notification capability for any connected serial or Ethernet device without interfering with the device. eWON technology supports the protocols of most major PLC manufacturers.
The primary advantages of this solution are the independence of the system and its simplicity and robustness.
As an IP device, the eWON industrial router provides standard IT services (web pages, FTP data transfer, and routing). This makes the eWON industrial router very easy to access and interface from a PC.
The eWON alarm notification system can be controlled using web pages and monitored from the network, and the data can be made available for logging or process control.
Surveillance in an infrastructure network or an industrial system implies a system that automatically issues alarms so that action can be taken to avoid damage or failure. This application note describes how eWON technology can provide an alarm notification system that can quickly be configured and deployed to monitor up to 350 tags and generate alarms for each of these tags.
Triggering and alarm notification
In this scenario, the eWON industrial router acts primarily as a fault indication unit, while still enabling remote access for acknowledgment, control and monitoring as a secondary function.
The eWON industrial router has an internal tags database. Each tag represents a value acquired by the eWON unit from a connected device (primarily PLCs) via its serial or Ethernet port.
Using the eWON configuration web pages (HMI), the user can configure four alarm thresholds for each tag. The user can also define a dead band and a trigger delay in order to avoid hysteresis effects or unwanted alarms.
Once configured, the eWON industrial router is able to issue notifications automatically to several recipients using its embedded modem:
- by e-mail
- by text messaging (SMS)*
The text message always contains the tag concerned and its value. An additional message can be configured to appear at the beginning of the text message. Text messages and e-mail messages can be used in combination, since the related file, such as the event log or data log, can be attached to an email message to provide more information to the recipient.
Besides e-mail and text messaging, the eWON industrial router offers two additional channels for sending notifications:
- put FTP
- SNMP trap
- ALM: alarm state when a measured value exceeds a defined threshold
- ACK: acknowledgment state
- RTN: return to normal state if the alarm was not acknowledged
- END: end state of an alarm
Alarms can be acknowledged automatically or via the eWON website by authenticated users, who can acknowledge alarms and check the real-time alarm table after logging in.
* In some countries, text messages can be sent using a PSTN modem as well as a GSM (mobile/cellular telephone) modem
Practical aspects of alarm notification
GSM numbers have to be configured in the internal memory of the eWON units, which does not provide the flexibility necessary for managing the people – technicians and engineers – who must respond to alarm notifications. They may sometimes be unavailable due to illness, or they may be replaced, and nobody wants to have to reconfigure every eWON unit in the field whenever it is necessary to change the phone number of a notification recipient.
One solution is to provide several mobile phones that can be shared by the people on alarm notification duty. The team members must hand over these mobile phones to the other team members as necessary.
Another solution is to interface the eWON industrial routers with a dedicated alarm manager program. In this scenario, the eWON industrial routers can be configured to send alarm notifications to any desired alarm manager program, which relays them to the people on alarm notification duty. As this program only has to be installed once in a central location, it is easier to update the list of alarm recipients and the associated mobile phone numbers managed by the program.
This program also allows alarms to be cascaded, which is the functionality to allow recipients to receive eWON notifications in escalation situations.
Featured products
Alarm notification capability is a standard feature of all eWON product lines.
The eWON 2101CD industrial router is the entry-level product for this type of application. It provides a modem and an Ethernet-to-serial gateway for connecting a wide range of industrial devices using various communication protocols. The eWON 2101CD industrial router has the following modem options:
- GSM/GPRS quad band: eWON ref. EW332x8
- UMTS (3G): eWON ref. EW332xB
- HSDPA/HSUPA (3G+): eWON ref. EW332xA
- PSTN: eWON ref. EW332x4
- ISDN: eWON ref. EW332x3
- '6’ if the MPI/Profibus protocol must be used for connection to the PLC(s)
- ‘0’ otherwise.
Conclusion
The eWON industrial router provides alarm notification capability for any connected serial or Ethernet device without interfering with the device. eWON technology supports the protocols of most major PLC manufacturers.
The primary advantages of this solution are the independence of the system and its simplicity and robustness.
As an IP device, the eWON industrial router provides standard IT services (web pages, FTP data transfer, and routing). This makes the eWON industrial router very easy to access and interface from a PC.
The eWON alarm notification system can be controlled using web pages and monitored from the network, and the data can be made available for logging or process control.
