Rockwell Automation 9323-PA1E QUICK START GUIDE APS 6.0 - Manual (Page 26)

Control Basics
2–9
The figure below shows a simple 1-rung ladder program. The rung includes two
input instructions and an output instruction. Note, in the example below each
instruction has a name (Examine if Closed), a mnemonic (XIC), and an address
(I:1/0).
A simple rung, using bit instructions.
XIC
( )
O:3
0
] [
I:1
0
]/[
I:1
1
XIO OTE
Input Instructions Output Instruction
XIC = Examine if Closed
XIO = Examine if Open
OTE = Output Energize
Address I:1/0
Address I:1/1
Address O:3/0
True/False Status
The data file bits that these instructions are addressed to will be either a logic 0
(OFF) or a logic 1 (ON). This determines whether the instruction is regarded as
“true” or “false”:
The status of the instruction is
If the data file
bit is
XIC
Examine if Closed
] [
XIO
Examine if Open
]/[ ( )
OTE
Output Energize
Logic 0 False True False
Logic 1 True False True