Using the SCADALink IP100 Terminal Server’s Monitor/Restart Mode

The SCADALink IP100 has a Serial and Ethernet Monitor / Restart mode that can be used to monitor and restart locked up equipment at remote sites.

The Monitor/Restart function can be used to monitor serial and ethernet traffic and initiate a momentary power reset upon prolonged communication failure. Serial port monitoring monitors traffic on a designated serial port allowing monitoring of RS232 and RS485 (COM2) serial traffic; and can initiate alarm or restart upon the absence of serial communications on the monitored channel.  Ethernet monitoring uses the PING function to PING a designated IP address,  initiating alarm output or equipment restart when a PING response in no longer received.

The Monitor/Restart  feature can be used to resetting locked-up equipment such as cellular modems, radio modems, or routers, at remote sites. This feature can be used to prevent prolonged system outages and alleviate the need travel to remote sites to reset locked up equipment. 

The Restart function can be initiated automatically or manually via the GUI access.  Manual reset can only be initiated if you have still have network connectivity to the IP100.

Using the IP100 RELAY Output for Reboot

The IP100 has outputs (SWP, RELAY, and DO) that can be used different purposes including rebooting of equipment.  It is recommended the RELAY output be used reboot equipment as shown below. The normally closed (NC)  contact of the IP100 can be used in series with the power circuit of the equipment that you want to reboot.  Momentarily pulsing this output will open the circuit to reset the locked up device.  The use of the NC output allows power to be normally supplied to the device even when the IP100 is not powered.

 connecting-the-ip100-for-restarts      ip100-restart-connection-diagram

IP100 Monitor/Restart Configuration

The IP100 can be configured for Monitor/Restart  Operation via IP100 GUI Software connected serially or via LAN. Serial and Ethernet monitoring can be selected, with matching timeout parameters. The monitor functions can used to control outputs in On/Off and Momentary (Pulse) modes.  Momentary outputs are typically used for reboot of the locked up device.


Application Example

Following is an application example showing a IP100 configured to control reboot of radio modem.  The most common SCADA failure is loss of SCADA communication  caused by lockup of a cellular or radio-modem. Without remote connectivity to site,  there is no visibility to the site by the SCADA system for alarming or control and necessitate urgent site visit by maintenance personnel.



 Reboot Resetting Locked Up Devices with the IP100

This IP100 used in this modem can be used to reset remote SCADA and Telecom Devices that can become locked up due to power surges or firmware errors. When the device becomes locked up it does not communicate or fully function and cannot be accessed remotely to initiate a reboot. In this cases the only way to get the device working again is to reboot the device by power cycling. For remote sites in industrial applications like oil and gas, or pipelines, the site may located in difficult to access sites offshore, in the muskeg, or on mountain tops requiring expensive and inconvenient argo, quad, helicopter or boat access.

Modem / RTU Reboot

SCADA and Telecom devices that may occasionally require reboot include:

  • Cellular Modems
  • Radiomodem
  • Routers
  • RTU
  • EFM
  • PLC
  • HMI

The IP100 Monitor/Restart function can provides extra monitoring and lockup prevention at sites that experience difficult to resolve intermittent lockup problems.  For sites that experience frequent lockup,  one should try to find and solve the root cause of problem.

The versatile SCADALink IP100 featuring low power 10-30VDC operation, wide temperature ratings,  and Class I Div 2 rating, can be ideal  for application in critical  industrial applications such as pipelines and oil and gas production.


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