DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-162
Chapter 5: Standard RLL Instructions
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A
B
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D
The instruction will be executed once per scan, provided the input remains on. The function
parameters are loaded into the first level of the accumulator stack and the accumulator by
two additional instructions. Listed below are the steps necessary to program the Add To Top
function.
Step 1: Load the length of the table (number of V-memory locations) into the first level
of the accumulator stack. This parameter must be a HEX value, 0 to FF.
Step 2: Load the starting V-memory location for the table into the accumulator.
(Remember, the starting location of the table is used as the table length counter.)
This parameter must be a HEX value.
Step 3: Insert the ATT instructions which specifies source V-memory location (Vaaa).
This is where the value will be moved from.
Helpful Hint:— The instruction will be executed every scan if the input logic is on. If you do
not want the instruction to execute for more than one scan, a one-shot (PD) should be used in
the input logic.
Helpful Hint: — For parameters that require HEX values when referencing memory locations,
the LDA instruction can be used to convert an octal address to the HEX equivalent and load
the value into the accumulator.
Helpful Hint: — The table counter value should be set to indicate the starting point for the
operation. Also, it must be set to a value that is within the length of the table. For example, if
the table is 6 words long, then the allowable range of values that could be in the table counter
should be between 1 and 6. If the value is outside of this range or zero, the data will not be
moved into the table. Also, a one-shot (PD) should be used so the value will only be set in one
scan and will not affect the instruction operation.
NOTE: Status flags (SPs) are only valid until another instruction that uses the same flag is executed or
the end of the scan. The pointer for this instruction can be set to start anywhere in the table. It is not
set automatically. You must load a value into the pointer somewhere in your program.
aaa
V
AT T
Operand Data Type
DL06 Range
A
aaa
V-memory
V
See memory map
Discrete Bit Flags
Description
SP56
On when the table pointer equal to the table size.
DS
Used
HPP Used
Add to Top (ATT)
The Add To Top instruction pushes a value on to a V-memory
table from a V-memory location. When the value is added to the
table all other values are pushed down 1 location.
