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Relay-Type (Bit) Instructions
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
Operand Bit
•
•
•
•
•
(1) PTO and PWM files are only for use with MicroLogix 1100 BBB unit.
(2) See Important note about indirect addressing.
Publication 1763-RM001C-EN-P - October 2009
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:
XIO and XIC Instruction Operation
Rung State
Addressed
Bit
True
Off
True
On
False
--
Addressing Modes and File Types can be used as shown in the following
table:
Data Files
•
•
•
•
You cannot use indirect addressing with: S, ST, MG, PD,
IMPORTANT
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, CS, IOS, LCD,
and DLS files.
XIC Instruction
Returns a False
Returns a True
Instruction is not evaluated
(1)
Function Files
•
•
•
•
•
•
•
•
XIO Instruction
Returns a True
Returns a False
Instruction is not evaluated
Address
Address Level
(2)
Mode
•
•
•
•
•
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