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11 COMMUNICATION BETWEEN THE MASTER STATION AND THE
LOCAL STATION
MELSEC-QnA
11
11. COMMUNICATION BETWEEN THE MASTER STATION AND THE
LOCAL STATION
How to set, program, and confirm the operation of the module is described using a
system configuration example.
11.1 Secured 32-bit Data
When the following conditions, 1) and 2) are satisfied in the CC-Link network, 32-bit
data in remote registers (RWr/RWw) between a programmable controller CPU and a
master/local station can be secured.
1) Access starts from a remote register (RWr/RWw) address of an "even number".
RWr00
RWr01
RWr02
RWr03
RWw00
RWw01
RWw02
RWw03
D000
CPU device
RWr00
RWr01
RWr02
RWr03
Remote register
Master station
RWw00
RWw01
RWw02
RWw03
Local station
D001
D002
D003
CPU device
Programmable
controller CPU
D001
D002
D003
D000
D004
RWr04 RWw04
Remote register
Programmable
controller CPU
Remote register
Master station Local station
Remote register
Because the start address on the remote register
side is an "odd address", new and old data may be
mixed in 16-bit (1-word) units.
2) Access by the sequence program must be made in units of even points.
RWr00
RWr01
RWr02
RWr03
D000
CPU device
RWr00
RWr01
RWr02
RWr03
Remote register
Master station
D001
D002
D003
Programmable
controller CPU
D001
D002
D003
D000
FROM
DFRO
Programmable
controller CPU
CPU device Remote register
Master station
Because the access is made for each single point
(1-word), new and old data may be mixed in 16-bit
(1-word) units.