Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル

FX

3G

/FX

3U

/FX

3UC

 Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

36 Interrupt Function and Pulse Catch Function

FN

C

275
-F

N

C

27

9

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Trans
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r 3

FN

C

280-
FN

C

289

H

igh Speed 

Pr

ocessing 2

FN

C

290-
FN

C

299

E

xtension Fi

le 

R

egister

FN

C

300-
FN

C

30

5

FX

3U

-C

F-A

D

P

SFC•

STL

Pr

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ing

In

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rupt
 

Funct

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S

pecial

 D

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Er

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Executi

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 T

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When the input relay X000 to X007 turns ON from OFF after the FNC 04 (EI) instruction is executed, the special
auxiliary relay M8170 to M8177 is set for interrupt processing.
The FNC04 (EI) instruction is not required in FX

3G

 PLCs.

*1.

Cleared when the PLC mode is changed from STOP to RUN.

*2.

This function is supported only in FX

3U

/FX

3UC

 PLCs.

*1.

When using the pulse catch function at 5 

µs or when receiving a pulse whose response frequency is 50 k to

100 kHz using a high speed counter, perform the following:
- Make sure that the wiring length is 5 m or less.
- Connect a bleeder resistor of 1.5 k

Ω (1 W or more) to the input terminal, and make sure that the load current 

of the open collector transistor output in the counterpart equipment is 20 mA or more including the input 
current in the main unit.

1) When receiving an input again, it is necessary to reset the device which was once set using a program.

Accordingly, until a device is reset, a new input cannot be received.

2) When it is necessary to receive continuous short pulses (input signals), use the external input interrupt function or

high speed counter function.

3) A filter adjustment program is not required.
4) The pulse catch function is executed regardless of the operations of the special auxiliary relays M8050 to M8055

for respectively disabling interrupts.

X000

M8170

*1

X001

M8171

*1

X002

M8172

*1

X003

M8173

*1

X004

M8174

*1

X005

M8175

*1

X006

M8176

*1*2

X007

M8177

*1*2

M8170

X002

Reset input

RST

M8170

Y000

When the rising edge of X000 is detected,
M8170 is set as interrupt.

The pulse catch result is reset.

FNC 04

EI

Step

0

The FNC04 (EI) instruction is not required in FX

3G

 PLCs.

Input pulse width
(shown below)

EI

X000(Input)

M8170

X002(Reset)

[X000 to X005]: 5 

µs or more

*1

[X006 and X007]: 50 

µs or more

[X002 and X005]: 50 

µs or more

FX

3U

/FX

3UC

 PLC

[X000, X001, X003 and X004]: 10 

µs or more

FX

3G

 PLC