Mitsubishi Electric FX3G SERIES Programming Manual page 768

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

2. Procedure using a pulse contact instruction (M2800

By using an auxiliary relay M2800 to M3071 in a rising/falling

edge detection instruction (LDP, LDF, ANDP, ANDF, ORP or

ORF), the ON status can be efficiently transferred by the same

When M2800 or later is specified as a device in a rising/falling

edge detection instruction, only the first rising/falling edge

detection instruction after a coil instruction is executed.

Accordingly, when X001 is set to ON, only the transfer condition

in a state relay currently in the ON status is ON during one

operation cycle, and then the ON status is transferred to the

next state relay.

It is allowable to program a device number used in LD,

LDI, OR or ORI instructions after a corresponding coil in the ladder block. However, if the same device

number is programmed in a LDP, LDF, ANDP, ANDF, ORP or ORF instruction, the priority is given to such an

instruction and the transfer condition is not effective.

Caution on using a rising/falling edge detection contact

When a rising/falling detection contact in a LDP, LDF, ANDP, ANDF, ORP or ORF instruction is used in a state relay,

the contact whose status was changed while the state relay was OFF is detected when the state relay turns ON the

When it is necessary to immediately detect the rising edge or falling edge for a condition which may change while a

state relay is OFF, change the program as shown below:

When the ON status is transferred to S70 at the falling edge of X013 and then X014 turns OFF after that, the falling

edge of X014 is not detected at this point because S3 is OFF. When S3 turns ON the next time, the falling edge of

X014 is detected.

Accordingly, when S3 turns ON the next time, the ON status is immediately transferred to S70.

35 SFC Program and Step Ladder

Ladder block

35.1 SFC Program

(Transfer input)

Fx3u series Fx3uc series