Mitsubishi MELSEC-F FX-TRN-BEG-E, User Manual

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FX-TRN-BEG-E B: Let’s Study the Basics 2
B-16
2) Contact instruction and OUT instruction
As you studied in ’A: Let’s Learn the FX Series PLC!’, the input/output equipment is
individually connected to the PLC.
The operation of individual control equipment is determined by the internal wiring within the
PLC. This internal wiring work is called programming.
In this software, connection (programming) can be easily performed using instruction
symbols.
Contact symbols
OUT instruction symbol
Example of program (See Chapter 1 in the guidance.)
Reference: Instruction word
Inside the PLC, contact symbols and Out instruction symbols are handled in "instruction words".
NO
contact
Is normally open (OFF), and is closed (turned ON) when a signal is
received from the input equipment.
NC
contact
Is normally closed (ON), and is opened (turned OFF) when a signal
is received from the input equipment.
Is driven (turned ON) when signals for all the contacts connected to the
OUT instructions are received (turned ON).
X020
Y000 Green lamp
X020
Y001 Yellow lamp
X021
Y002 Red lamp
X024
X022
Bus: The left vertical line is used as the base for in writing a program.
LD
OUT
AND
OR
OR
AND