Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 80

LD elements
The following table lists the LD elements that can be used in FBD/LD programs.
Item
Left rail
Normally open contact
Normally closed contact
Rising edge pulse
Falling edge pulse
Negated rising edge pulse
Negated falling edge pulse
Coil
Inverse coil
Set coil
Reset coil
■ AND operation and OR operation of contact elements
At each contact, an AND operation or OR operation is performed depending on the connection status, and the operation
result is output.
• Series connection (1): An AND operation is performed with the previous operation result.
• Parallel connection (2): An OR operation is performed with the previous operation result.
(2)
7 FBD/LD
78
7.1 Configuration
Description
A start point of ladder program.
The output of the left rail is always on.
Energized when the specified device or label is on.
Energized when the specified device or label is off.
Energized on the rising edge (off to on) of the specified device or label.
Energized on the falling edge (on to off) of the specified device or label.
Energized when the specified device or label is off, on, or on the falling edge (on to off).
Energized when the specified device or label is off, on, or on the rising edge (off to on).
Outputs the operation result to the specified device or label.
When the operation result turns off, the specified device or label turns on.
When the operation result turns on, the specified device or label turns on.
The device or label keeps on state even after the operation result turns off.
When the operation result turns on, the specified device or label turns off.
If the operation result is off, the status of the device or label does not change.
(1) Contact connected in series
(1)
(2) Contact connected in parallel
( )