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COM
(3) When selecting refresh items
(a) Select refresh items by SD778, and set SM775 to ON.
The following table shows the refresh items that can be designated by turning SM775
ON/OFF and with SD778.
(b) Select refresh items using b0 to b5 and b15 of SD778.
Whether to execute each bit of SD778 or not can be designated as shown below:
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 (communication
with peripheral device is executed/not
executed) is 0
Refresh Item When SM775 is OFF When SM775 is ON
I/O refresh
Not executed
Whether to be executed or not can be
selected.
CC-Link refresh
Executed
CC-Link IE controller network refresh
MELSECNET/H refresh
Auto refresh of intelligent function modules
Auto refresh using QCPU standard area of
multiple CPU system
Reading input/output data of all modules other
than the multiple CPU system group
Auto refresh using the multiple CPU high speed
transmission area of multiple CPU system
Communication with peripheral device
Bit of SD778 Executed Not Executed
b0 to b5
10
b15
01
b15
b0
b1b2
b3
b4b5b6b14
CC-Link IE controller network,
MELSECNET/H refresh
1/0 1/01/01/01/01/001/0
SD778
Auto refresh of
intelligent function module
Auto refresh using QCPU standard
area of multiple CPU system
Reading inputs/outputs from the outside
of the multiple CPU system group
Auto refresh using the multiple CPU high speed
transmission area of multiple CPU system
Communication with peripheral devices
I/O refresh
CC-Link refresh
Example