Mitsubishi MELSEC Q Series Programming Manual page 513

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
• Sending operation from host CPU
[ LCPU]
Bit of SD778 Executed
b0 to b3, b14
b15
b15 b14 b13
SD778 1/0 1/0
Example: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
CPU shared memory) is 1.
: When b15 of SD778 (communication
with peripheral device is executed/not
executed) is 0.
Not Executed
1 0
0 1
to b4 b3 b2 b1 b0
0 1/0 0 1/0 1/0
COM
I/O refresh
CC-Link refresh
Auto refresh with intelligent
function module
Communication with display unit
Communication with peripheral
device
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