411
COM
1
2
3
4
4
6
7
8
7.6
S
tructure cr
eation
instructions
7.6.10
COM
(b) Set an execution status for each processing in SD778.
Set an execution status for each bit of SD778 as shown below.
[ QCPU]
To make only the send/receive processing with the remote I/O station faster, designate MELSECNET/H refresh
only.
(Set only b2 and b15 of SD778 to 1 (SD778: 8004
H
).)
Refresh between the multiple CPUs by the COM instruction is performed under the following condition.
• Receiving operation from other CPUs: When b4 of SD778 (auto refresh in the CPU shared memory) is 1.
• Sending operation from host CPU: When b15 of SD778 (execution status of service processing) is 0.
[ LCPU]
To speed up processing of the display unit only, specify communication with the display unit only. (Write "1" to bits
b14 and b15 of SD778 (SD778:C000
H
).)
Bit of SD778
Executed
Not Executed
b0 to b6
1
0
b15
0
1
Bit of SD778
Executed
Not Executed
b0, b1, b3, b6, b14
1
0
b15
0
1
b15
b0
b1
b2
b3
b4
b5
b6
b14
to
CC-Lin
k
IE Controller Networ
k,
MELSECNET/H refresh
1/0
1/0
1/0
1/0
1/0
1/0
0
1/0
SD778
Auto refresh of
intelligent function module
Auto refresh using
Q
CP
U
standard
area of multiple CP
U
s
y
stem
Reading inputs/outputs from the outside
of the multiple CP
U
s
y
stem group
Auto refresh using the multiple CP
U
high speed
transmission area of multiple CP
U
s
y
stem
Service processing
(
communication with programming tool
,
GOT
,
or other external devices
)
I/O refresh
CC-Lin
k
refresh
1/0
CC-Lin
k
IE Field Networ
k
refresh
Example
b15
b0
b1
b2
b3
b4
b14b13
Auto refresh b
y
intelligent function module
to
0
0
1/0
1/0
1/0
1/0
1/0
SD778
Communication with displa
y
unit
Service processing
(
communication with
programming tool
,
GOT
,
or external devices
)
I/O refresh
Refresh via CC-Lin
k
1/0
0
0
b5
b6
Refresh via CC-Lin
k
IE Field Networ
k
Example