Allen-Bradley PLC-5 User Manual page 326

D-26 Instruction Set Quick Reference
Instruction
BTR
BLOCK TRANSFER READ
Rack
Group
Module
Control Block
Data File
Length
Continuous
Instruction
BTW
BLOCK TRANSFER WRITE
Rack
Group
Module
Control Block
Data File
Length
Continuous
Publication 1785-UM012D-EN-P - July 2005
Block Transfer Read
BTR
1
0
0
BT11:100
N10:110
40
Y
PLC-5/30, -5/40, -5/40E, -5/40L
-5/60, -5/60L, -5/80, -5/80E
controllers
S:7 BT queue
bit # full for rack
(1)
08
1
09
1
10
1
11
12
13
14
15
(1)
PLC-5/11, -5/20, and 5/20E controllers also
Block Transfer Write
BTW
1
0
0
BT11:0
N10:10
40
Y
Description
If the input conditions go from false to true, a block transfer
read is initiated for the I/O module located at rack 1, group 0,
module 0. The Control Block (BT11:100, 6-word file) contains
status for the transfer. The Data File (N10:110) is where the
data read from the module is stored. The BT Length (40)
identifies the number of words in the transfer. A non-continuous
block transfer is queued and run only once on a false-to-true
rung transition; a continuous block transfer is repeatedly
requeued.
You can also use the N data type for the control blocks.
See page F-8 for a description of prescan operation for
this instruction.
PLC-5/40, -5/40L, -5/60,
-5/60L, -5/80, -5/40E,
-5/80E controllers
S:32 BT queue
bit # full for rack
0 08
1 09
2 10
3 11
4 12
5 13
6 14
7 15
Description
If the input conditions go from false-to-true, the block
transfer write is initiated for the I/O module located at rack
1, group 0, module 0. The Control Block (BT11:0, 6-word file)
contains status for the transfer. The Data File contains the
data to write to the module (N10:10). The BT Length (40)
identifies the number of words in the transfer. A
non-continuous block transfer is queued and run only once
on a false-to-true rung transition; a continuous block
transfer is repeatedly requeued. You can also use the N
data type for the control block.
See page f-8 for a description of prescan operation for this
instruction.
PLC-5/60, -5/60L,
-5/80, -5/80E controllers
S:34 BT queue
bit # full for rack
10 08
11 09
12 10
13 11
14 12
15 13
16 14
17 15
20
21
22
23
24
25
26
27