Automationdirect.com DL06 - Page 324

DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-163
Chapter 5: Standard RLL Instructions
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A
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In the following example, when X1 is on, the constant value (K6) is loaded into the accumulator
using the Load instruction. This value specifies the length of the table and is placed in the first
stack location after the Load Address instruction is executed. The octal address 1400 (V1400),
which is the starting location for the destination table and table counter, is loaded into the
accumulator. The source location (V1500) is specified in the Add to Top instruction. The table
counter will be increased by “1” after the instruction is executed.
DirectSOFT32 Display
LD
K
6
X1
Load theconstant value6
(Hex.) into thelower 16 bits
of theaccumulator
LDA
O 1400
AT T
V1500
Copy thespecifiedvalue
from V1500 to thetable
Conver toctal 1400 to HEX
300 and load thevalue into
theaccumulator
Handheld Programmer Keystrokes
STR
$
SHFT
ANDST
L
3
D
SHFT
0
A
MLR
T
MLR
T
PREV
1
B
ENT
6
G
0
A
0
A
ENT
SHFT
ANDST
L
3
D
1
B
4
E
0
A
ENT
0
A
1
B
5
F
0
A
ENT
V1401
050 0
V1402 999 9
V1403
307 4
V1404
898 9
V1405
101 0
V1406
204 6
V1407
XXX X
V150
0
XXX X
1
2
3
4
5
6
Data Source
V140
0
000 2
TableCounterTable
(e.g.: 6--2=4)
DirectSOFT32 Display (optional one- shot method)
LD
K6
C0
X
1C
0
PD
Load theconstant value6
(HEX) into thelower 16 bits
of theaccumulato
r
LDA
O1400
Conver toctal 1400 to HEX
300 and load thevalue into
theaccumulator. This is the
starting tablelocation
.
DirectSOFT (optional one-shot method)
DirectSOFT
For the ATT instruction, the table counter
determines the number of additions that can be
made before the instruction will stop executing.
So, it is helpful to understand how the system
uses this counter to control the execution.
For example, if the table counter was set to 2, and
the table length was 6 words, then there could
only be 4 additions of data before the execution
was stopped. This can easily be calculated by:
Table length – table counter = number of executions
Also, our example uses a normal input contact
(X1) to control the execution. Since the CPU
scan is extremely fast, and the table counter
increments automatically, the data would be
moved into the table very quickly. If this is a
problem for your application, you have an
option of using a one-shot (PD) to add one
value each time the input contact transitions
from low to high.