Allen-Bradley PLC-5 - Page 111

Publication 1785-UM012D-EN-P - July 2005
Communicating with a PLC-5 Adapter Channel 7-13
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.
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.
BTW
RACK
GROUP
MODULE
4*
0
0
BTW
RACK
GROUP
MODULE
4*
1
0
BTW
RACK
GROUP
MODULE
4*
1
1
Supervisor Program Adapter Configuration
Group
0
0
1
1
Module
0
1
0
1
BTW Control
BT000:000
BT000:000
BT000:000
BT011:001
BTR Control
BT010:000
BT000:000
BT011:000
BT011:040
RACK
STARTING GROUP
SIZE
4*
0
FULL
* Must Match
Address EN ST DN ER CO EW NR TO RW RLEN DLEN FILE ELEM R G M
BT10:0 0 0 0 0 0 0 0 0 0 64 0 24 10 0 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.
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.
BTR
RACK
GROUP
MODULE
4*
1
1
Block transfer further defined in the adapter-mode processor channel via Data Monitor
IMPORTANT
Adapter-mode block-transfer reads and block-transfer
writes in the same group/module location must have the
same length.