Mitsubishi MELSEC Q Series Programming Manual page 510

COM
(6) If the scan time from the linked station is longer than the sequence program scan time at the
host station, designating the COM instruction at the host station will not increase the speed
of data communications.
Sequence program
Link scan
Operation Error
(1) There are no operation errors associated with the COM instruction.
7-136
0
COM END
The programs in which the COM instruction cannot be used are shown below:
• Low-speed execution type programs
• Interrupt programs
• Fixed scan execution type programs
0 COM END 0 COM
END
0
COM END