Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 227)

Publication 1785-UM012D-EN-P - July 2005
Programming Considerations 13-9
To ensure that the received BTR data table file has been properly updated
before you use the data, do the following:
1. Enable the input conditions of the BTR rung.
2. Wait for the BTR done bit to be set.
3. Allow time for housekeeping to force and send the changed data from
the block-transfer data buffer to the block-transfer data table file.
To ensure that the intended BTW data table file was properly transferred, do
the following:
1. Change the data in the block-transfer output data table.
2. Allow time for housekeeping to force and send the changed data from
the block-transfer output data table file to the block-transfer data buffer.
3. Enable the BTW
OTL
BTR data valid
BT10:0
BTR.DN detected
DN
OTE)
/
If BTR data is not valid
BTR
Rack
Group
Module
Control Block
Data File
Length
Continuous
01
4
0
BT10:0
N9:0
6
N
BTR data valid
any logic
accessing
the BTR data or
copy data to
another file
BTR data valid
OTU)
[END OF FILE]
After the BTR done bit is set, the valid data in the BT data buffer
is copied to the BTR data table file during housekeeping.
BTR DN detected
BTR data valid
41401