The data displayed in a trend graph is different from the most recent data in the PLC.

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  • No : 4742
  • Displayed Date : 2025/12/01 13:51
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The data displayed in a trend graph is different from the most recent data in the PLC.

The data displayed in a trend graph is different from the most recent data in the PLC.

Category : 

Answer

<Cause>

The trend graph is not redrawn.

 

<Solution>

The graph data once displayed is not updated unless the redraw command is specified.
To update to the newest data, turn bit 14 or 15 of the control device memory from OFF to ON (leading edge).

 

15

14

13

12

11

10

09

08

07

06

05

04

03

02

01

00

 b

 a

 0

 0

 0

 Points to Display :  Setting range: 0 - 780 (HEX)

 

  1. Bit 14
    Trend lines are redrawn at the edge (0 → 1) by the specified number of points.
    Drawing is performed over the previous one without clearing the trend graph area.


     
  2. Bit 15
    Trend lines are redrawn at the edge (0 → 1) by the specified number of points.
    The trend graph area is cleared and the newest trend lines are drawn.

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