Mitsubishi GOT2000 Series, Connection Manual

Page: 69 / 674

2. DEVICE RANGE THAT CAN BE SET
2 - 5
2
DEVICE RA
NGE THA
T
CAN B
E SET
(4) Setting of the mask type (MELSEC-FX)
Set the item for monitoring or writing only the specified
bits of the buffer memory.
HINT HINT HINT
Mask type
The mask type is effective when using for the buffer
memories divided per 4 bits, such as an analog input
block.
(a) Mask type 0
Monitor and write the buffer memory value directly.
(b) Mask type 1
• (For 16 bits)
Monitor and write only b0 to b3 of the buffer
memory.
Example:
The monitor value is 0001
H
when monitoring
BM=4321
H
as mask type 1.
BM0=0001
H
when writing input value 4321
H
to
BM0=0000
H
as mask type 1.
• (For 32 bits)
Monitor and write only b0 to b3 and b16 to 19 of
the buffer memory.
Example:
The monitor value is 00050001
H
when monitoring
BM0=87654321
H
as mask type 1.
BM0=00050001
H
when writing input value
87654321
H
to BM0=00000000
H
as mask type 1.
(c) Mask type 2
• (For 16 bits)
Monitor and write only b4 to b7 of the buffer
memory.
Example:
The monitor value is 0002
H
when monitoring
BM0=4321
H
as mask type 2.
BM0=0010
H
when writing input value 4321
H
to
BM0=0000
H
as mask type 2.
• (For 32 bits)
Monitor and write only b4 to b7 and b20 to 23 of
the buffer memory.
Example:
The monitor value is 00060002
H
when monitoring
BM0=87654321
H
as mask type 2.
BM0=00500010
H
when writing input value
87654321
H
to BM0=00000000
H
as mask type 2.
(d) Mask type 3
• (For 16 bits)
Monitor and write only b8 to b11 of the buffer
memory.
Example:
The monitor value is 0003
H
when monitoring
BM0=4321
H
as mask type 3.
BM0=0100
H
when writing input value 4321
H
to
BM0=0000
H
as mask type 3.
BM0
Monitor value
H
4 3 2 1
0 0 0 1
H
BM0
(Before writing)
(After writing)
BM0
Input value
H
4 3 2 1
0 0 0 0
H
0 0 0 1
H
H
BM0 8 7 6 5 4 3 2 1
0 0 0 5 0 0 0 1
H
Monitor value
H
BM0
8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0
H
Input value
BM0
0 0 0 5 0 0 0 1
H
(Before writing)
(After writing)
BM0
Monitor value
H
4 3 2 1
0 0 0 2
H
BM0
(Before writing)
(After writing)
BM0
Input value
H
4 3 2 1
0 0 0 0
H
0 0 1 0
H
H
BM0 8 7 6 5 4 3 2 1
0 0 0 6 0 0 0 2
H
Monitor value
H
BM0
8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0
H
Input value
BM0
0 0 5 0 0 0 1 0
H
(Before writing)
(After writing)
BM0
Monitor value
H
4 3 2 1
0 0 0 3
H
BM0
(Before writing)
(After writing)
BM0
Input value
H
4 3 2 1
0 0 0 0
H
0 1 0 0
H