7-20
Section
Conversion Instructions
444
7-20-6
16-TO-4 ENCODER – DMPX(77)
SB
: First source word
IR, SR, AR, DM, HR, TC, LR
R
: Result word
IR, SR, AR, DM, HR, LR
Ladder Symbols
Operand Data Areas
Di
: Digit designator
IR, SR, AR, DM, HR, TC, LR, #
DMPX(77)
SB
R
Di
@DMPX(77)
SB
R
Di
The rightmost two digits of Di must each be between 0 and 3.
All source words must be in the same data area.
DM 6144 to DM 6655 cannot be used for SB, R, or Di.
When the execution condition is OFF, DMPX(77) is not executed. When the
execution condition is ON, DMPX(77) determines the position of the highest ON
bit in S, encodes it into single-digit hexadecimal value corresponding to the bit
number of the highest ON bit number, then transfers the hexadecimal value to
the specified digit in R. The digits to receive the results are specified in Di, which
also specifies the number of digits to be encoded.
The following is an example of a one-digit encode operation to digit number 1 of
R, i.e., here Di would be 0001.
Result word
First source word
C
0
0
0
1
0
0
0
1
0
0
0
1
0
1
1
0
C transferred to indicate bit number 12 as
the highest ON bit.
Up to four digits from four consecutive source words starting with S may be en-
coded and the digits written to R in order from the designated first digit. If more
digits are designated than remain in R (counting from the designated first digit),
the remaining digits will be placed at digits starting back at the beginning of R.
The final word to be converted (S plus the number of digits to be converted) must
be in the same data area as SB.
The digits of Di are set as shown below.
Specifies the first digit to receive converted data (0 to 3).
Number of words to be converted (0 to 3)
0: 1 word
1: 2 words
2: 3 words
3: 4 words
Not used.
Digit numbers: 3 2 1 0
Limitations
Description
Digit Designator
