2 Ladder Program
12-14 SmartAXIS Touch User's Manual
2.2 Instructions Reference
The instructions for ladder program are divided into basic instructions, which perform sequencing, and advanced
instructions, which perform moves, comparisons, Boolean computations, binary arithmetic operations, bit shifts, and
other operations. Some instruction words cannot be used in interrupt processes.
● Basic Instruction List
In an interrupt process, the processing of the main program is interrupted, using the interrupt input, timer
interrupt, and high-speed counter of function settings, and a specified subroutine is executed. If a
subroutine that includes instruction words that cannot be used in interrupt processes is executed, a ladder
program execution error occurs.
The input and operation of SmartAXIS ladder program requires specialist knowledge.
To make effective use of the SmartAXIS, take the time to develop a thorough understanding of the
contents and programs in this manual.
Symbol Name and Diagram Function
Interrupt
Program
Execution
LOD
Load
The LOD instruction starts the logical
operation with an NO (normally open)
contact.
Stores intermediate results and reads
contact status
YES
LODN
Load Not
The LODN instruction starts the logical
operation with an NC (normally closed)
contact.
Stores intermediate results and reads
contact status
YES
OUT
Output
Outputs the result of bit logical operation YES
OUTN
Output Not
Outputs the inverted result of bit logical
operation
YES
SET
Set
Sets output, internal relay, data register
bit or shift register
YES
RST
Reset
Resets output, internal relay, data
register bit or shift register
YES
AND
And
Series connection of NO contact YES
ANDN
And Not
Series connection of NC contact YES
OR
Or
Parallel connection of NO contact YES
ORN
Or Not
Parallel connection of NC contact YES
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