Mitsubishi Electric FX3G SERIES Programming Manual page 806

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

3. Operation when a timer is used [interrupt function]

Make sure that counting using a general timer is disabled, even a 1ms retentive type timer.

In an interrupt routine, use timers for routine program T192 to T199.

4. Non-overlap of input [input interrupt (with/without delay function) and pulse catch function]

The inputs X000 to X007 can be used for high-speed counters, input interrupts, pulse catch, SPD, ZRN, DSZR and

DVIT instructions and for general-purpose inputs.

Make sure inputs do not overlap with each other.

When using SFC program (STL instruction), do not drive state relays S in a SET or OUT instruction in an interrupt

5. When using SFC program (STL instruction)

When using SFC programs (STL instruction), do not drive state relays S using SET or OUT instructions in an interrupt

6. Operation of devices latched in the ON status [interrupt function]

Devices which were set to ON in an interrupt routine are held in the ON status even after the interrupt routine is

When the RST instruction for a timer or counter is executed, the reset status of the timer or counter is also held.

To turn OFF a device held in the ON status or for canceling such a timer or counter held in the reset status, reset such

a device or deactivate the RST instruction respectively inside or outsite the routine.

Example in which outputs are latched

In the program example shown below, the counter C0 is provided to count X001. When X001 turns from OFF to

ON, the interrupt program I001 is executed only in one scan, and then the counter C0 is reset and Y007 is output.

Program example

Timing chart

Execution of interrupt

program I001 triggered

Interrupt program

C0 remains reset

Y007 is being output

36 Interrupt Function and Pulse Catch Function

Because the C0 reset

instruction is valid, the current

value of C0 remains unchanged

even if a pulses are input.

Outputs are latched.

36.2 Common Items

Fx3u series Fx3uc series