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.
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
