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Conversion Instructions Section 3-11
3-11-9 DATA ENCODER: DMPX(077)
Purpose FInds the location of the first or last ON bit within the source word (or 16-word
range), and writes that value to the specified digit (or byte) in the result word.
Ladder Symbol
Variations
Applicable Program Areas
Operands S: First Source Word
There can be anywhere from 1 to 32 source words, depending upon the type
of conversion process and number of digits/bytes being converted. The
source words must be in the same data area.
R: Result Word
The locations of the bits that were ON in the source word(s) are written to the
digits/bytes in R starting with the specified first digit/byte.
C: Control Word
The control word specifies whether DMPX(077) will perform a 16-to-4 bit con-
version or an 256-to-8 bit conversion, whether the leftmost or rightmost ON bit
will be encoded, the number of digits or bytes that will be converted, and the
starting digit or byte where the results will be written.
DMPX(077)
S
R
C
S: First source word
R: Result word
C: Control word
Variations Executed Each Cycle for ON Condition DMPX(077)
Executed Once for Upward Differentiation @DMPX(077)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
3 2 1 0
Conversion process
0: 16-to-4 bits (word to digit)
1: 256-to-8 bits (16-word range to byte)
Bit to encode
0: Leftmost bit (highest bit address)
1: Rightmost bit (lowest bit address)
Number of digits/bytes to be converted
16-to-4: 0 to 3 (1 to 4 digits)
256-to-8: 0 or 1 (1 or 2 bytes)
Specifies the first digit/byte to receive converted data.
16-to-4: 0 to 3 (digit 0 to 3)
256-to-8: 0 or 1 (byte 0 or 1)
Digit number:
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