Publication 1766-RM001A-EN-P - October 2008
246
Conversion Instructions
FRD - Convert from
Binary Coded Decimal
(BCD)
Instruction Type: output
The FRD instruction is used to convert the Binary Coded Decimal (BCD)
source value to an integer and place the result in the destination.
Addressing Modes and File Types can be used as shown in the following
table:
FRD Instruction Source Operand
The source can be either a word address or the math register. The
maximum BCD source values permissible are:
•
9999 if the source is a word address (allowing only a 4-digit BCD
value)
S:0/3
Sign Bit
always resets
Math Status Bits
With this Bit:
The Controller:
FRD
From BCD
Source
S:0
0000h<
Dest
N7:0
0<
FRD
Execution Time for the FRD Instructions
Controller
When Rung Is:
True
False
MicroLogix 1400
5.4790 µs
0.5151 µs
FRD Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 92.
Parameter
Data Files
Function Files
CS - Comms
IO
S -
I/O
DL
S -
D
a
ta
Log
Address
Mode
(1)
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG,
PD
RI/RIX
PLS
RTC
HS
C
PTOX, P
W
MX
STI
EII
BH
I
MMI
LCD
Imme
diate
Di
re
ct
Indir
e
ct
Bi
t
Wo
rd
Long
W
o
rd
E
lem
en
t
Source
•
•
•
•
•
•
•
•
•
•
(2)
Destination
•
•
•
•
•
•
•
•
•
(1) See Important note about indirect addressing.
(2) See FRD Instruction Source Operand on page 246.
IMPORTANT
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
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