User guide

Chapter 20
Math Instructions
20–19
Decode 4 to 1 of 16 DCD Output Instruction
(DCD)
DCD
DECODE 4 to 1 of 16
Source N7:0
11A7
Dest N7:1
0000000010000000
F1 F2 F3 F4 F5
ZOOM on DCD –(DCD)– 2.3.0.0.2
NAME: DECODE 4 TO 1 OF 16
SOURCE: N7:0 4519 (decimal)
DEST: N7:1 128 (decimal)
EDT_DAT
HHT Ladder Display:
HHT Zoom Display:
Ladder Diagrams and APS Displays:
(online monitor mode)
Hex
Binary
When the rung is true, this output instruction turns on one bit of the
destination word. The particular bit that is turned on depends on the value of
the first four bits of the source word. See the table below. This instruction
can be used to multiplex data. It could be used for applications such as
rotary switches, keypads, bank switching, etc.
Source Destination
Bit 15–04 03 02 01 00 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
x 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
x 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
x 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
x 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
x 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0
x 0 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0
x 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
x 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0
x 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
x 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
x 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
x 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0
x 1 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
x 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
x 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Decode 4 to 1 of 16 (DCD)