Mitsubishi Electric MELSEC-Q Series User Manual page 103

(a) Access to cyclic data
When link devices are accessed, the integrity of 32-bit data can be assured by
satisfying the following conditions.
• When directly accessing link devices:
The start device number of RWr/RWw is multiples of 2.
The number of points assigned to RWr/RWw is multiples of 2.
0H
1H
2H
Access by using start
3H
device No. which is a
multiples of 2 and
4H
in 2-word (32-bit) units
5H
6H
7H
• When accessing buffer memories:
Access using the DMOV instruction
The start address of the buffer memory is multiples of 2.
U0\
DMOV K100 G10
POINT
For data assurance of more than 32 bits, use the block data assurance per station.
Caution
When the scan time of the CPU module is longer, the data communication between
the Simple Motion module and the slave stations may not be able to be kept
constant. If a synchronous communication error occurs at connecting the Simple
Motion module and the slave stations, take measures shown below.
•Lengthen the operation cycle of the Simple Motion module.
•Shorten the scan time of the programmable controller. For how to shorten the scan
time, refer to the user's manual for the CPU module used.
CPU module
Device
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
DMOV instruction
8 - 13
Simple Motion module
Link refresh
Simple Motion module
RWr,RWw
0H
2 words
(32 bits)
1H
2H
2 words
(32 bits)
3H
4H
2 words
(32 bits)
5H
6H
2 words
(32 bits)
7H
Chapter 8 FUNCTIONS
RWr,RWw
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
Access by using start
address No. which is a
multiple of 2 and
in 2-word (32-bit) units