3 - 31 3 - 31
MELSEC-Q
3 SPECIFICATIONS
(9) Global control area (Buffer memory address: 2081 (821
H
))
The buffer memory (2081(821
H
)) value and corresponding command table are
shown below.
Bit
position
Value
(valid/invalid)
Command
Description
8 to 15
1/0
Group 1 to 8 selection
Bits 8 to 15 correspond respectively to groups 1 to 8 and
shows that the bit value is transmitted by the global control
command to the 1 group (refer below). More than one
group at a time can be selected from groups 1 to 8.
When all bits 8 to 15 are 0, global control commands are
sent to all the slaves.
5
1/0
SYNC
The actual output data is written and held.
4
1/0
UNSYNC
The actual output data hold is canceled.
3
1/0
FREEZE
The actual input data is held and read.
2
1/0
UNFREEZE
The actual input data hold is canceled.
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 8
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SYNC
UNSYNC
FREEZE
UNFREEZE
: Don't care
Bit position
Bit specifications for UNSYNC/SYNC and UNFREEZE/FREEZE
5
4
3
2
SYNC
UNSYNC
FREEZE
UNFREEZE
0
0
0
0
0
0
1
b
0
0
1
0
b
1
0
0
b
1
0
0
0
b
1
1
b
b
1
1
0
b
b
1
0
1
b
b
1
0
1
0
b
b
: Don't care
b: Conducted
: Not conducted
