Publication 1766-RM001A-EN-P - October 2008
Conversion Instructions
253
GCD - Gray Code
Instruction Type: output
The GCD instruction converts Gray code data (Source) to an integer value
(Destination). If the Gray code input is negative (high bit set), the
Destination is set to 32767 and the overflow flag is set.
Addressing Modes and File Types are shown in the following table:
Updates to Math Status Bits
GCD
Gray Code
Source
I1:2.0
225<
Dest
N7:1
190<
GCD
Execution Time for the GCD Instructions
Controller
When Rung Is:
True
False
MicroLogix 1400
5.4970 µs
0.5618 µs
GCD Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 4-2.
Parameter
Data Files
Function Files
CS
- Comms
IO
S -
I/
O
DL
S
-
D
a
ta
L
o
g
Address
Mode
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG,
PD
RI/
R
IX
PL
S
RTC
HS
C
PTO
X
, PWMX
STI
EII
BH
I
MMI
LC
D
Imme
diate
Di
re
c
t
Indir
e
c
t
Bi
t
Wo
rd
Lo
ng
W
o
rd
Elemen
t
Source
•
•
•
•
•
•
•
•
•
Destination
•
•
•
•
•
•
•
•
•
Math Status Bits
With this Bit:
The Controller:
S:0/0
Carry
always reset
S:0/1
Overflow
set if the Gray code input is negative, otherwise is reset
S:0/2
Zero Bit
set if the destination is zero, otherwise reset
S:0/3
Sign Bit
always reset
S:5/0
Overflow Trap
set if the Overflow Bit is set, otherwise reset
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