User`s guide

Table Of Contents
Trends
140 Mitsubishi Electric, MA00759F
6.1 Historical Trend
These functions mean that analog values from the controller can be collected and
presented in a trend object in the operator panel. The presentation is in curve form.
The collected values are stored in the operator panel’s project memory.
It is possible to define several independent trend curves in the same or different
blocks. The number is limited by the size of the project memory and its degree of
utilization.
The time interval between the collection of data and how many values are to be
stored are defined in the trend object.
Calculation of Trend Size
It is possible to calculate how much space trend data will take up in the project
memory with the following equation.
S = TOS + AK (2 + (AS + 1) * 8)
TOS = TrendObjectSize; if all parameters for a trend object are changed, TOS = 320
bytes.
AK = Number of defined curves in the trend object.
AS = Number of Samples rounded-off to the nearest hundred.
S = Number of bytes.
Note:
A large number of trend pens and a very frequent sample interval will affect the per-
formance of the operator panel.