Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 224)

Publication 1785-UM012D-EN-P - July 2005
13-6 Programming Considerations
Step 1 - Select Which Group of Data You Want to Force
You also encounter this error if you try to transfer block-transfer data that
crosses the forcible range you configured in the extended force configuration
table.
When you select the group of data you want to force, you must select and
configure data that corresponds to an entire “chunk” or multiple “chunks” of
block-transfer data. For example:
You want to force some data associated with block-transfer read #2 and with
block-transfer read #4. To select the data, you could:
IMPORTANT
Group the data in the extended force configuration table so
that you separate read date from write data. If you do not
separate read and write data, you encounter error code -3 if:
• program a BTW instruction using a data file that you
configured in the extended force configuration table
as a read application
• program a BTR instruction using a data file that you
configured in the extended force configuration table
as a write application
Word Data Table File N11
0
20
32
55
80
BTR #1
BTR #2
BTR #3
BTR #4
• Select all of data file N11
• Select N11 beginning at word 20 for 60 words (i.e., beginning at the start
of BTR #2 and ending at the end of BTR #4)
• Make two selections, one beginning at the start of BTR #2 with the size
of BTR #2 (N11:20 for 12 words), and one beginning at the start of BTR
#4 with the size of BTR #4 (N11:55 for 25 words).