Allen-Bradley PLC-5 User Manual page 111

In this example, the first block
transfer in the supervisor uses the
BTR control word listed in group 0
module 0, which is BT010:000.
BT10:0 points to file 24 and element 10 and
has a length of 64 words.
Program multiple block-transfers to an adapter-mode controller channel by
matching block-transfer instructions in the supervisory controller to control
files in the adapter.
Supervisor Program
BTW
RACK
GROUP
MODULE
BTW
RACK
GROUP
MODULE
BTW
RACK
GROUP
MODULE
BTR
RACK
GROUP
MODULE
Block transfer further defined in the adapter-mode processor channel via Data Monitor
Address EN ST DN ER CO EW NR TO RW RLEN DLEN FILE ELEM R G M
BT10:0 0
Assuming that file 24 has been created as an integer file, the data written down from the first block-transfer will
be found in N24:10 to N24:73. The second block-transfer in the supervisor writes its data to the file to which
BT11:0 points, and the third block-transfer writes its data to the file to which BT11:40 points.
You can have up to 15 writes and 15 reads. Each block transfer to a particular
group/module location uses the I/O addresses for that rack/group for status
bits. These locations are lost to discrete transfer. Therefore, if you configure all
available 15 block-transfer read/write pairs, no bits will be available for
discrete transfer. See page 7-15 for more information.
IMPORTANT
Communicating with a PLC-5 Adapter Channel
Adapter Configuration
RACK
4*
STARTING GROUP
0
SIZE
0
Group
0
0
4*
1
1
1
0
4*
1
1
4*
1
1
0 0 0 0 0 0 0 0
Adapter-mode block-transfer reads and block-transfer
writes in the same group/module location must have the
same length.
4*
* Must Match
0
FULL
Module BTW Control
0 BT000:000
1 BT000:000
BT000:000
0
BT011:001
1
64 0 24 10 0 0 0
Publication 1785-UM012D-EN-P - July 2005
7-13
BTR Control
BT010:000
BT000:000
BT011:000
BT011:040