Publication 1763-RM001C-EN-P - October 2009
160
Relay-Type (Bit) Instructions
When used on a rung, the bit address being examined can correspond to
the status of real world input devices connected to the base unit or
expansion I/O, or internal addresses (data or function files). Examples of
devices that turn on or off:
•
a push button wired to an input (addressed as I1:0/4)
•
an output wired to a pilot light (addressed as O0:0/2)
•
a timer controlling a light (addressed as T4:3/DN)
•
a bit in the bit file (addressed as B3/16)
The instructions operate as follows:
Addressing Modes and File Types can be used as shown in the following
table:
XIO and XIC Instruction Operation
Rung State
Addressed
Bit
XIC Instruction
XIO Instruction
True
Off
Returns a False
Returns a True
True
On
Returns a True
Returns a False
False
--
Instruction is not evaluated
Instruction is not evaluated
XIC and XIO Instructions Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Data Files
Function Files
(1)
CS - Comms
IO
S -
I/O
DL
S -
D
a
ta
Log
Address
Mode
(2)
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG, PD
RI/RIX
PLS
RTC
HS
C
PTO, PW
M
STI
EII
BH
I
MMI
LCD
Imm
e
diat
e
Di
re
ct
Indir
e
ct
Bi
t
Wo
rd
Long W
o
rd
E
lem
en
t
Operand Bit
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
(1) PTO and PWM files are only for use with MicroLogix 1100 BBB unit.
(2) See Important note about indirect addressing.
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, CS, IOS, LCD,
and DLS files.
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