Tag Archives: Mitsubishi PLC

The meaning of k4m100 in Mitsubishi plc

Mitsubishi plc k4m100

K1 represents four consecutive addresses, and K4 represents 4 x 4 consecutive addresses, that is, 16.
Similarly, K2 is 8 consecutive addresses; K3 is 12 consecutive addresses.
M100 is an address, K4 represents 16 bits from M100 to M115, not M100 represents 16 bits.

What is the meaning of Mitsubishi PLC constant H?

The Mitsubishi PLC constant H represents a hexadecimal number and is mainly used to indicate the operational value of the application function instruction.

K is a symbol indicating a decimal integer. It is mainly used to specify the set value of the timer or counter and the value in the operand of the application function instruction. H is a hexadecimal number, which is mainly used to indicate the operation value of the application function instruction. For example, 20 is expressed as K20 in decimal and H14 in hexadecimal.

How to use the M command in Mitsubishi plc

Mitsubishi plc M: Auxiliary relay (equivalent to the intermediate relay in the electrical diagram). His control method is the same as Y, but there is no output port, just a single device. Like Y, there are coils and normally open, normally closed contacts.

When multiple control methods use the same type of Y. At this time, direct control may cross, and the program may appear complicated. At this time, you can use M to control.

For example: you have to control 5 different modes of Y0. If you control Y0 directly, it will generate a lot of interlocks (you should prevent the other 4 modes from working when you use one mode) to make the program complicated and error-prone. (At this time, you will feel that if there are 5 Y0, then how good it will be, but if you use it again, there will be double coils.) If you use 1 M coil instead of Y0 coil for each control mode. Then use the contacts of the respective M to control Y0. When M gets electricity. Y0 will also be powered. (Is it equivalent to 5 Y0)

M: FX2N series range (default) M0-M499 is a normal auxiliary relay M500–M1023 is a latch auxiliary relay (power-off retention type)

Mitsubishi plc m8013 and m8014 functions

M8013 oscillates in a one-second frequency cycle, that is, it is turned on once in one second.
M8014 oscillates in a one-minute frequency cycle, that is, it is turned on once every minute.

Two fixed frequency internal relays.

Mitsubishi plc programming Ladder diagram: motor is rotating for 10 seconds, inversion for 8 seconds, cycle

Ladder diagram:

Press X0, M0 is energized and self-locked.
At the same time, KT1 is turned on and Y0 is output. At this time, the motor is rotating 10S.

When the 10S time is up, T1 disconnects YO, and M1 is powered on and locked.

At the same time Y1 output, the motor is reversed.

KT28 seconds to the time, M0 reset, at this time a working cycle is over, automatically enter the next cycle.

INT instruction in Mitsubishi PLC

How to use the INT instruction in Mitsubishi PLC, why INT 100.00=99?

INT is a floating point number to integer, 100.000=100

But your plc program is not equal to 100, it must be used in other places, so the value of D40 has changed. such as:

How to use the ALT instruction in Mitsubishi PLC

ALT instruction is alternate output
Assume that Y0 is the indicator light.
At this time, Y0 is off, and when X0 is pressed, the indicator lights up. Press again to turn off the light, then press it again. It’s as simple as that, it will alternate output. This can also be used as a single button to start the stop program!
Just use it when using the rising edge to achieve the alternation. If X0 does not use the rising edge, it is very likely that the PLC has actually read this switch twice.

How to input Mitsubishi PLC programming instruction MC

Mitsubishi PLC master control MC input method:

When writing the MC master command, first press F8 to enter the input command format.

Then write MC space N0, space Mx press the confirm button to complete;

When the master control speed is fast, press F8 to input MCR, and the space Nx is confirmed and completed.
Note: The master command can be used seven times, from N0 to N7.


The main reason is that the program written by PLC has made mistakes, some of which may be logical errors, or may be input errors. You have to check it out.
Programmable logic controller (programmable logic controller), which uses a class of programmable memory used in its internal storage program, executes user oriented instructions such as logic operation, sequence control, timing, counting and arithmetic operation, and controls various types of machinery or production process by digital or analog input / output.