Hi,

Can someone let me know why restarting HMI ONLINE is not advisable?

Our HMI runs on Windows NT 4.0 BTW... what's the risk posed by doing that?

 

Reading CSA's reply here:

http://www.control.com/thread/1026249749#1026249771

almost confirms that our HMI can be restarted or shutdown since it's completely independent.

My question is, has someone done this in the past?

 

dinster,

About the ONLY reason one would not want to re-boot a GE Mark V operator interface is if it's supplying "critical" data via a serial or Ethernet connection to some other control system, such as a DCS or natural gas compressor control, etc. Rebooting the operator interface absolutely *WILL NOT* affect the turbine operation, but if any other control system or process is affected by the loss of the data which is coming via or through the HMI, then that's a pretty good reason not to reboot the operator interface.

But, if there is only the operator interface connected to the turbine control panel and there is no critical data being passed by the operator interface to some other control system via MODBUS or GSM, then rebooting the operator interface (regardless of operating system) will affect turbine operation.

To answer you last question: It done all the time around the world, many times per day. There's even a recent posting where the originator talks about having to re-boot the <I> every few hours, and there's no mention of adverse affects on turbine operation.