19.10.3 Data Block Display Graph Structure
When using the Data Block Display feature, you need to reserve
the areas for the number of addresses as specified below, beginning
from the Control Word Address. You can set the Control Word Address
to either a device/PLC address or the display unit's internal
device address.
When you configure an offset, you can configure the display data
in addresses offset from the address for storing the [Number of
Data].
The display speed of graphs differ depending on the location of
the [Control Word Address]. Whether you use a device/PLC address or
use the read area of the display unit internal devices.
When setting a device/PLC address
When the "control" display bit (bit 0) turns ON, the display
unit needs more time to read data from the device/PLC and display
it on the graph than it takes to process from the display unit
Internal Device. However, when the graph is not displayed, the time
taken to display the whole screen is faster than the display unit
Internal Device.
Display Unit
Internal Device Using the Read Area
The Read Area constantly reads data from the device/PLC to the
display unit, regardless of screen display status. After the
control display bit (bit 0) turns ON, the time to display the graph
is shorter than when using a device/PLC address. However, when the
Read Area size is large, the time to display the entire screen is
slower than when using a device/PLC address.
-
To use the display unit's Internal Device Read
Area, from the [System Settings] window click the [Display Unit]
link. In the [System Area] tab, set up the [Read Area Size].
A maximum of 256 words are allowed.
-
When setting a device/PLC address and
displaying multiple data lines (channels) in a Block Display, use
offset settings to improve the graph display speed. By setting all
the data in continuous addresses as in the following, data can be
easily read in one round of communication.
|
