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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
3) Transmission trigger conditions
The transmission trigger conditions designate the conditions
interpreted by the R2 as a data transmission trigger generation when
monitoring the monitor target devices.
Transmission trigger generation
condition setting
Monitor target
b14 = OFF b14 = ON
Timing of transmission trigger
generation
RX, RY
At rising edge
detection
At falling edge
detection
The transmission trigger is
generated when the R2
detects a change from ON to
OFF.
RWw, RWr (b14 state is invalid)
The transmission trigger is
generated when the
designated RW value changes
to a value other than "0".
(b) Monitor target designation (When designating a status)
(
R2
78H, 7AH,
⋅
⋅
⋅
F4H, F6H)
Set the transmission trigger detection status for the R2 when carrying out
monitor transmission.
1
b15 b0b14 b13 b12 b11
0
~
(Monitor target)
…
78
H
F7
H
Monitor target (status)
1) Monitor target status
2) Transmission trigger conditions
1) Monitor target status
The monitor target status designates the status information monitored
by the R2 for detecting the transmission trigger in respect to the
information held by the master station/programmable controller CPU.
Bit position
b13 b12
Monitor target status
0 0 (Setting prohibited)
0 1 CC-Link data link status
1 0 Programmable controller CPU operation status
1 1 Programmable controller CPU status