Справочник Пользователя для Mitsubishi Electronics FX2NC

FX Series Programmable Controlers

5-44

The highest active bit within the readable range has
its location noted as a numbered offset from the
source head address (S). This is stored in the
destination register (D).

a) The readable range is defined by the largest number storable in a binary format within the

number of destination storage bits specified by n, i.e. if n was equal to 4 bits a maximum
number within the range 0 to 15 can be written to the destination device. Hence, if bit
devices were being used as the source data, 16 bit devices would be used, i.e. the head bit
device and 15 further, consecutive devices.

b) If the stored destination number is 0 (zero) then the source head address bit is ON, i.e. the

active bit has a 0 (zero) offset from the head address. However, if NO bits are ON within the
source area, 0 (zero) is written to the destination device and an error is generated.

c) When the source device is a data or word device n must be taken from the range 1 

to 4 as

there are only 16 source bits available within a single data word.

ENCO
FNC 42
(Encode)

Then location of
the highest active
bit is stored as a
numerical position
from the head
address

X, Y, M, S,
T, C, D, V,
Z

T, C, D, V,
Z

K, H,

Note:
S=X, Y, M, S then
       n range=1-8
S= T,C,D then 
       n range = 1-4
n = 0, then no 
       processing

ENCO,
ENCOP:
7 steps

FX

0(S)

FX

0N

FX FX

(2C)

FX

2N(C)

FX

(2C)

FX

FX

2N(C)

FX

0N

FX

0(s)

PULSE-P

FX

(2C)

FX

FX

2N(C)

FX

0N

FX

0(s)

16 BIT OPERATION

FX

FX

0N

FX

0(s)

FX

(2C)

FX

2N(C)

32 BIT OPERATION

X5

D 10

K 3

[ S ]

[ D ]

M 10

[ n ]

ENCO

M15 M14 M13 M12 M11 M10

M16

M17

0

1

0

0

0

0

0

0

7.

6.

5.

4.

3.

2.

1.

0.

0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1

D10

4 2 1

. .

+

= 3