QUICKDESIGNER
Allen-Bradley
••••
61
The following drawing shows how a Block Transfer Write function writes data from the PLC to the
BTW0120 file in the target display. Since the Length was set to 16, there will be 16 words written from
the PLC to the target display.
Reading Word Data in BTW Files
The PLC uses BTW functions to send data to remote modules. This section describes how to use Block
Transfer Tag names to read word data from BTW data files in the target display.
To read word information in a data file, you need to specify the name of the data file and the word
within the file. The command format used to specify the data is FILENAME[word]. Example:
BTW0120[02]. In the following example, the name of the data file is BTW0120 and the size of the file
is 16 words. The example illustrates several Tag Names and their relationship to the data file.
BTW0120
Tag Name
Data File Location
BTW0120[00]
Word 0
BTW0120[01]
Word 1
BTW0120[02]
Word 2
BTW0120[14]
Word 14
BTW0120[15]
Word 15
This command format allows you to assign a word from the data file to an operator such as a Numeric
Data Display. For example, when creating a numeric data display, you are presented with a setting
menu that requests a Tag name. If you entered BTW0120[7], the target display would read word 7 from
the data file labeled BTW0120 and display it in a numeric field.