Mitsubishi MELSEC Q Series, Programming Manual

Page: 775 / 816

8.13 Selection of Refresh Instructions
8-67
8
QCPU INS
T
R
UCTIONS
COM
COM
Refresh between the multiple CPUs by the COM instruction is performed under
the following conditions.
• Receive operation from other CPUs : When b4 of SD778 (auto refresh of CPU
shared memory) is 1.
• Send operation from host CPU : When b15 of SD778 (execution/non-
execution of communication with
peripheral device) is 0
(4) Upon the execution of the COM instruction, the CPU module suspends the processing of the
sequence program, and refreshes the specified refresh item.
(5) The COM instruction can be used in a sequence program for any number of times.
However, note that the sequence program scan time will be lengthened by the time taken for
the refresh time of the refresh item selected for SD778.
(6) Only with the Universal model QCPUs, an interrupt is permitted during the execution of the
COM instruction. However, note that the data may be separated if the refresh data are used
in an interrupt program.
(7) Refresh items for the COM instruction are indicated in the following table.
1. The COM instruction cannot be used in low-speed execution type programs,
fixed scan execution type programs or interrupt programs.
CPU module model
Function
version
Serial No. SM775 Refresh item
Q02
Q02H
Q06H
Q12H
Q25H
A
––––
ON/OFF Refreshes all refresh items.
B
'04011' or
lower
OFF Refreshes all refresh items.
ON Communication with peripherals only.
'04012' or
higher
OFF Refreshes all refresh items.
ON Refreshes the refresh items selected for SD778.
Q02U
Q03UD
Q03UDE
Q04UDH
Q04UDEH
Q06UDH
Q06UDEH
Q13UDH
Q13UDEH
Q26UDH
Q26UDEH
B
––––
OFF Refreshes all refresh items.
ON Refreshes the refresh items selected for SD778.
0 END 0 END 0
Execution of C O M
instruction
Execution of C O M
instruction
Refres h es t h e specified
refres h items
Refres h es t h e specified
refres h items