DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-147
Chapter 5: Standard RLL Instructions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Listed below are the steps necessary to program the Find function.
Step 1: Load the length of the table (number of V-memory locations) into the second level of
the accumulator stack. This parameter must be a HEX value, 0–FF.
Step 2: Load the starting V-memory location for the table into the first level of the accumulator
stack. This parameter must be a HEX value.
Step 3: Load the offset from the starting location to begin the search. This parameter must be
a HEX value.
Step 4: Insert the Find instruction which specifies the first value to be found in the table.
Results:— The offset from the starting address to the first V-memory location which contains
the search value (in HEX) is returned to the accumulator. SP53 will be set On if an address
outside the table is specified in the offset or the value is not found. If the value is not found 0
will be returned in the accumulator.
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.
NOTE: Status flags are only valid until another instruction that uses the same flags is executed. The
pointer for this instruction starts at 0 and resides in the accumulator.
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 second stack location when the following Load Address and Load instruction is
executed. The octal address 1400 (V1400) is the starting location for the table and is loaded
into the accumulator. This value is placed in the first level of the accumulator stack when the
following Load instruction is executed. The offset (K2) is loaded into the lower 16 bits of the
accumulator using the Load instruction. The value to be found in the table is specified in the
Find instruction. If a value is found equal to the search value, the offset (from the starting
location of the table) where the value is located will reside in the accumulator.
FIND
A aaa
Discrete Bit Flags Description
SP53 On if there is no value in the table that is equal to the search value.
Operand Data Type DL06 Range
A
aaa
V-memory V See memory map
Constant K 0–FF
DS Used
HPP Used
Find (FIND)
The Find instruction is used to search for a specified value
in a V-memory table of up to 255 locations. The function
parameters are loaded into the first and second levels of the
accumulator stack and the accumulator by three additional
instructions.
To Next Page
Loading...
