Справочник Пользователя для Mitsubishi Electronics FX3S-MT/DSS

10 Use of High-speed Counters

FX

3S

 Series Programmable Controllers

User's Manual - Hardware Edition

Introduc

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Features an

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Produc

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Introducti

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Sp

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Ve

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Peri
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Confi

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In

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Prep

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Pow

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Wi

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Input W

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Counters

These counters are 32-bit up-count/down-count binary counters.

Examples of program
1) For C235

• C235 counts the number of times the input terminal X000 

switches from OFF to ON while X012 is on.

• While X011 is on, the counter resets when RST instruction 

is executed.

• The counters C235 to C245 switch to the down-count or up-

count mode by turning on or off M8235 to M8245.

2) For C244

• C244 starts counting immediately when the input terminal 

X006 turns on while X012 is on. The count input terminal is 
X000. The setting for this example is the data of the 
indirectly designated data register (D1, D0).

• C244 can be reset by X011 on the sequence. For C244, 

X001 is allocated as the external reset input. The counter 
resets immediately when X001 turns on.

• The counters C235 to C245 switch to the down-count or up-

count mode by turning on or off M8235 to M8245.

Example of operation
The above counter C235 operates as shown below.

X000

Main unit

Count input

X010

M8235

Down-count/

Up-count

X011

X012

C235

K-5

RST

C235

Reset

X000

Main unit

Count input

X001

X006

External reset

input

External start

input

X010

M8244

Down-count/

Up-count

X011

X012

C244

D0 (D1)

Reset

The setting is (D1, D0)

RST

C244

X010

X011

X000

C235

Current

value

C235 output contact

Up-count

Down-count

Up-count

0

1

2

3

4

5

4

3

2

1

0

-1

-2

-3

-4

-5

-6

-7

-8

When output has
operated

-7

-6

-5

-4

-3

0

X012

Reset input

Start input

Count input