Specifications

Main Properties
PlantScape Server and Client Configuration Guide 131
An accumulator point can access a single counter input value.
Accumulator Point Process Variable (PV)
The PV for an accumulator point is used to read a value from a counter that
continues to increment until it reaches its rollover value, at which time it resets.
The following example describes how accumulator process variables work and
illustrates some of the concepts used in defining the PV of an accumulator point.
Example
Suppose there is a server accumulator point named AZGALLONS and that this
point is connected to a field value that is a counter that counts from 0 to 4096. At
4096, the counter’s value rolls over to 0. Suppose also that the AZGALLONS scale
and meter factors are set to 1 and that the values of AZGALLONS and the field
values are as follows:
Figure 8.8 Accumulator Point
Controller ServerField
Counter
Flow Meter
Accumulator Point
AZGALLONS
Figure 8.9 Initial Condition: Counter and Accumulated Value Both 4000
AZGALLONS
4000
4000
plscpcg.book Page 131 Monday, May 28, 2001 10:11 AM