Re: [foxboro] ACCUM Block With Period = 8 (1 Hour)

Tom,

Sounds like a CAR.

Terry
 
> From: tbadura@xxxxxxxxxxx
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] ACCUM Block With Period = 8 (1 Hour)
> Date: Mon, 2 Nov 2009 22:47:54 -0600
> 
> Terry and Greg,
> I set the Meas input to the accum block at 1,000,000 and reset the
> total. The MRATE was then 277.78/sec - OK. After 1 Hour the total was
> 89,777.8 - off by that same factor.
> An OMGET of the PERTIM = 3600 as it should.
> 
> Again the parameters are:
> PERIOD = 8 (1 Hour)
> MTRFAC = 1
> PCNTOP = 0
> LSCI = 0 
> HSCI = 9999999
> LSCO = 0 
> HSCO = 9999999
> 
> I can't think of anything else that should have an effect.
> 
> 
> Tom Badura
> Plastics Engineering Company
> 
> 
> 
> -----Original Message-----
> From: Terry Doucet
> Tom,
> Can you report the block's PERTIM value? This is what the ACCUM block
> uses for the period of the block in seconds. It should read 3600 seconds
> per hour when you have block period = 8 (60 minutes). OMGET can
> retrieve the value.
> Terry
> 
> 
> 
> -----Original Message-----
> From: Gregory A Hurwitt
> 
> Just a wild guess, but there may be a cut-off error bug in the block, 
> i.e., not able to handle sufficiently small numbers internally.
> Try increasing your MEAS input by a couple of orders of magnitude and
> see 
> if the error persists or goes away.
> Greg Hurwitt 
> 
> 
> 
> 
> 
> 
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