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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
7.4 Transmitting data at the device and status change
7.4.1 Outline
With this function, the R2 monitors the device and status according to the details
preset by the user. When the data transmission command (data transmission timing) is
detected, the contents of the user-designated transmission table are transmission to
the external device. (Monitor transmission function)
When the user transmits data with this function, the R2 process can be randomly
designated by the user.
1) Device of master station or status of master station and programmable controller
CPU monitored by the R2 to detect the data transmission timing
2) Conditions for establishing data transmission timing (Refer to section 7.4.2)
3) Monitor interval time for R2 to monitor device or status used as data
transmission timing
By using this function, the programmable controller CPU does not need to be aware of
the data transmission timing.
RS-232-C
RWFF
RXF
RX7FF RX7F0
RY7FF RY7F0
RW0
RX0
RYF RY0
ON
~
~
~
~
~
~
~
Master station
Buffer memory
1) Setting for monitor
transmission
1) Setting for
transmission table
Buffer memory
specific
application area
Transmission
table
Transmission table
3) Transmit data according
to details designated in
transmission table
External device
Recep-
tion
2) Monitor of RX/RY/RW, etc.
Remote module
Generation of
transmission tri
gg
e
r
Remote module
R2
1) Designate the monitor transmission data in the monitor interval time
designation (
R2
70H), No. of monitor designation (
R2
71H), and monitor
designation 1 to 64 (
R2
78H to F7H) areas.
Designate the No. of the registered frame to be transmitted (the transmission
area can also be designated) in the transmission table designation (
R2
122H
to 185H).
2) R2 monitors the device or status on CC-Link.
3) When the transmission trigger is detected, the R2 follows the details of the
transmission table designated by the user, and transmits the contents of the
transmission table to the external device.