Eurotherm 6100, User Manual

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
HA029324
Issue 11 Oct 14 Page 128
4.3.12 Totalisers
INTRODUCTION
Each totaliser allows the user to maintain a running total of any input channel, or of any maths channel.
Using the maths functions, it is possible to totalise combinations of input channels, so the value of two
channels added together, or the difference between two channels could be totalised if required. The
totaliser equation is :
where tot
t
= totaliser value this sample*
tot
t-1
= totaliser value last sample*
ma
t
= value of totalised channel this sample*
PSF = Period Scaling Factor (See Period scaler description below)
USF = Units Scaling Factor (See Unit scaler description below)
*Note: Time between samples = Recording interval set in Group confi guration.
See ‘Update information’ in
Annex A for details.
CONFIGURATION
Figure 4.3.12, below, shows a typical (enabled) totaliser confi guration page
Totaliser Number Allows any of the available totalisers to be selected from the picklist, for confi gura-
tion.
Enable Allows the user to enable/disable the totaliser.
Value Shows the (dynamic) current value of the selected totaliser.
Total of Allows an input channel or a maths channel to be selected as the source to be total-
ised.
Low Cutoff The value of the source channel (in engineering units) below which it is not to be total-
ised.
High Cutoff The value of the source channel (in engineering units) above which it is not to be total-
ised.
Units The totalised units (e.g. m 3 )
Preset Allows the entry of a 10-character positive, or nine-character negative value from
which the totaliser is to start counting.
Direction of counting is defi ned by the sign of the Unit scaler viz: + = increment; - =
decrement.
Preset now Operation of this key initiates the totaliser preset.
tot
t

to
t

1

ma
t
PSF

USF