Mitsubishi Electronics FX3G Manuel D’Utilisation

404

/FX

3GC

/FX

3UC

Series

Programming Manual - Basic & Applied Instruction Edition

14 Handy Instruction – FNC 60 to FNC 69

14.3 FNC 62 – ABSD / Absolute Drum Sequencer

1) Write the following data to [

+1] to [

+4n-2,

+4n-1] in advance using a transfer instruction:

For example, store rising point data and falling point data alternately.

2) Output pattern

When the command input is set to ON, "n" points starting from

change as shown below.

Each rising point/falling point can be changed respectively by overwriting the data in [

+1,

] to

[

+4n-1, +4n-2].

Cautions

1. Specifying a high-speed counter (C235 to C255)

In DABSD instruction, a high-speed counter can be specified as

When the high-speed counter is specified, the output pattern contains response delay caused by the scan cycle with
regard to the current value of a counter.
When high responsivity is required in FX

/FX

3UC

PLCs, use the table high-speed comparison function offered by the

HSZ instruction, or use the HSCT instruction.

2. When specifying digits of a bit device as

1) Device number

Specify a multiple of 16 (0, 16, 32, 64 ...).

2) Number of digits

- In ABSD instruction (16-bit operation): Only K4 is available.
- In DABSD instruction (32-bit operation): Only K8 is available.

3. Other cautions

• The value "n" determines the number of target outputs (1

≤ n ≤ 64).

• Even if the command input is set to OFF, the ON/OFF status of outputs does not change.

Rising point

Falling point

Target output

Data value

(example)

Data value

(example)

[

+ 1,

]

[

+ 3,

+ 2]

140

[

+ 5,

+ 4]

100

[

+ 7,

+ 6]

200

[

+ 9,

+ 8]

160

[

+ 11,

+ 10]

[

+ 13,

+ 12]

240

[

+ 15,

+ 14]

280

…

⎯

…

⎯

…

[

+ 4n - 3,

+ 4n - 4]

[

+ 4n - 1,

+ 4n - 2]

+ n

− 1

140

100

200

160

240

280

180

360