Allen-Bradley PLC-5 User Manual page 227

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.
BTR.DN detected
BT10:0
DN
If BTR data is not valid
BTR data valid
/
BTR data valid
[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.
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
Programming Considerations
BTR data valid
OTL
BTR DN detected
OTE)
BTR
Rack
01
Group
4
Module 0
Control Block BT10:0
Data File N9:0
Length 6
N
Continuous
any logic
accessing
the BTR data or
copy data to
another file
BTR data valid
OTU)
41401
Publication 1785-UM012D-EN-P - July 2005
13-9