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 graph display data in addresses shifted (or offset) from the [Number of Data] address.
[Control], [Data Items] and [Offset] are all fixed as 16 bit.
For 32 bit devices, use the bottom 16 bits. Enter [0] for the top 16 bits.
The display speed of graphs differ depending on the location of the [Control Word Address]. Whether set to a device/PLC address or to a read area on the display unit internal device, the location of the [Control Word Address] changes the graph display speed.
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.
