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2. DEVICE RANGE THAT CAN BE SET
2 - 5
1
PREPARATORY
PROCEDURES FOR
MONITORING
2
DEVICE RANGE
THAT CAN BE SET
3
ACCESS RANGE
FOR MONITORING
4
HOW TO MONITOR
REDUNTANT
SYSTEM
5
BUS CONNECTION
6
DIRECT
CONNECTION TO
CPU
7
COMPUTER LINK
CONNECTION
8
ETHERNET
CONNECTION
(4) Setting of the mask type (MELSEC-FX)
Set the item for monitoring or writing only the specified
bits of the buffer memory.
HINTHINTHINT
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=4321H as mask type 1.
BM0=0001
H when writing input value 4321H to
BM0=0000H 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=00050001H when writing input value
87654321H to BM0=00000000H 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=4321H as mask type 2.
BM0=0010
H when writing input value 4321H to
BM0=0000H 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=87654321H as mask type 2.
BM0=00500010
H when writing input value
87654321H to BM0=00000000H 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 4321H to
BM0=0000
H as mask type 3.
BM0
Monitor value
H
4321
0001
H
BM0
(Before writing)
(After writing)
BM0
Input value
H
4321
0000
H
0001
H
H
BM0
87654321
00050001
H
Monitor value
H
BM0
87654321
00000000
H
Input value
BM0
00050001
H
(Before writing)
(After writing)
BM0
Monitor value
H
4321
0002
H
BM0
(Before writing)
(After writing)
BM0
Input value
H
4321
0000
H
0010
H
H
BM0
87654321
00060002
H
Monitor value
H
BM0
87654321
00000000
H
Input value
BM0
00500010
H
(Before writing)
(After writing)
BM0
Monitor value
H
4321
0003
H
BM0
(Before writing)
(After writing)
BM0
Input value
H
4321
0000
H
0100
H