List,
I would like to know about the accuracy/capabilities of a TIM block for
measuring equipment run time.
Awhile back I created a CALCA block for runtime based on info from the list.
Looking at data in an external historian, I notice some inaccuracy, and
sometimes 1 minute of actual runtime shows up as less than a minute in the
block output, i.e. running "slow" at times. (Before the CALCA block we had a
RAMP block, with appropriate scaling, which sometimes ran fast, giving more
than 24 hours in a day.) So I'm thinking of trying a TIM block in case it is
more accurate. Question for anyone who uses TIM blocks:
-How accurate is it?
-What does it use to count time? In the CALCA timer, I count up 1 sec each bpc
with a period of 1 second. Does TIM use the station block date and time, or is
it based on bpc too? The Period parameter doesn't seem to make a difference in
how fast it counts.
-What's the maximum time it can count up to? Measuring run time, we are going
into the thousands of hours, and TIM block seems to measure in seconds, so
maybe 10,000 hours or 36,000,000 sec would be a good capability. Just want to
make sure it doesn't hit some limit too early.
-Can the timers in TIM blocks be reset by a Boolean from a CIN block or do you
need a sequence block to do it? I want one timer to count forever anytime the
equipment runs, and one to be reset to zero occasionally by the operators.
Don't need a preset value.
Thanks for any info you can give.
-Joe
_________________________________________________________________________
This mailing list is neither sponsored nor endorsed by Schneider Electric
(formerly The Foxboro Company). Use the info you obtain here at your own
risks. See the disclaimer at www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
