Ladder Symbols In Structured Ladder Language - Mitsubishi MELSEC-Q Series Programming Manual

5.2.2

Ladder symbols in structured ladder language

The following table shows the ladder symbols that can be used in the structured ladder language.
For details, refer to the following manual.
MELSEC-Q/L Structured Programming Manual (Common Instructions)
*1
Normal
*1
Negation
Rising edge
Falling edge
Negated rising edge
Negated falling edge
Normal
Negation
Set
Reset
5.2 Structured Ladder Language
5-12
5.2.2 Ladder symbols in structured ladder language
Table 5.2.2-1 Ladder symbols in the structured ladder language (1/2)
Element Ladder symbol
*1,*2
*1,*2
*1,*2
*1,*2
*1 A contact performs an AND operation or OR operation according to the
connection of a ladder block and reflects in the operation result.
• For a series connection, it performs an AND operation with the operation result up
to that point, and takes the resulting value as the operation result.
• For a parallel connection, it performs an OR operation with the operation result up
to that point, and takes the resulting value as the operation result.
*2 Supported with GX Works2 Version 1.15R or later.
For the confirmation method of the version of GX Works2, refer to the
following manual.
GX Works2 Version1 Operating Manual (Common)
Description
Turns ON when a specified device or label is ON.
Turns OFF when a specified device or label is OFF.
Turns ON at the rising edge (OFF to ON) of a specified device or label.
Turns ON at the falling edge (ON to OFF) of a specified device or
label.
Turns ON when a specified device or label is OFF or ON, or at the
falling edge (ON to OFF) of a specified device or label.
Turns ON when a specified device or label is OFF or ON, or at the
rising edge (OFF to ON) of a specified device or label.
Outputs the operation result to a specified device or label.
A specified device or label turns ON when the operation result turns
OFF.
A specified device or label turns ON when the operation result turns ON.
Once the device or label turns ON, it remains ON even when the
operation result turns OFF.
A specified device or label turns OFF when the operation result turns
ON. If the operation result is OFF, the status of the device or label
does not change.
Series-connection contact
( )
Parallel-connection contact