Specifications

8 – Configuring Points
132 R400
Now suppose that the value of the field counter changes to 4050. We then have:
If the counter increases by another 50, it will roll over:
The value of AZGALLONS will continue to increase either until it is reset by an
operator, or until it reaches the maximum value that it can display (in which case
it will display a series of asterisks).
Engineering Units
In defining the PV of an accumulator point, you need to specify the engineering
units used in representing the PV value for an accumulator point; for example,
megalitres, Kwh, and so on.
Rollover Value
In defining an accumulator point you need to specify the value at which the
“physical” counting or totalizing mechanism on the device or controller rolls over.
Figure 8.10 Counter Increases by 50
AZGALLONS
4050
4050
Figure 8.11 Counter Rolls Over
AZGALLONS
4100
0004
plscpcg.book Page 132 Monday, May 28, 2001 10:11 AM