Hello All,

I have a need to monitor and record uptimes for both PLC & SCADA systems, this is to be used as a performance measure for our automation system (i.e: systems availability).

Has anyone out there ever attempted such a thing?

Regards,
Shaun

 

Shaun,

Wouldn't you be better recording down time, the uptime better be a huge number of hours. Perhaps you could compare an elapsed timer in each system or use a watchdog timer and add up the minutes communication is lost (if this is what you call down time). I would have a timer in each system because if one is down its timer will likely be stopped also.

Regards,
Roy

 

If you just want indication, then a digital output with a 1 second delay ON--OFF timer will satisfy you that microprocessors in the PLC and SCADA (HMI) are working, i.e. system is up or not.

If you want to quantify this, then you have to use a counter attached with a 1 second delay ON--OFF timer. Memory space used for this must retain numeric values even after Power Shut Down, i.e. now you can measure totally how much time the system remains up.