Mitsubishi MELSEC L Series User Manual page 326

14 DATA COMMUNICATIONS USING EXTERNAL DEVICE AND PROGRAMMABLE CONTROLLER CPU M : N CONFIGURATION
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6) The master station that received the communications complete report transmits a
response to the slave station that transmitted the communications complete report.
(Example)
Massage of 5)
External device of
slave station to
perform the
communications
complete report
(;) (1B)
(1C )
H
3B 31
H H
Master station
external device
(1B )
H
7) After completion of 6) above, or when the line usage time of the slave station that
obtained the line usage right exceeds the maximum data communications time:
a) The master station waits for a communications request from a slave station.
When the master station receives a communication request, it performs
processing from step 2).
b) The slave stations do not communicate data with the master station until data
communications with the programmable controller CPU are necessary.
When data communications with the programmable controller CPU becomes
necessary, that slave station performs processing from step 1).
8) When the master station itself wants to exchange data with the programmable
controller CPU and a slave stations does not have the line usage right, it transmits
all external devices except programmable controller CPU a general report data and
obtains the line usage right before communicating data with the programmable
controller CPU.
After data communications with the programmable controller CPU are complete,
the master station transmits all external devices general report data to inform the
slave stations that data communications with the programmable controller CPU are
complete.
During this time, the slave stations do not communicate data with the master
station until master station data communications are complete.
(Example)
External device of
master station that
obtained the line
usage right (1B )
H
(;) (1F)
3B 31
H H
External device of
master station that
transmits
communications
complete report
(;) (1F)
(1B )
H
3B 31
H H
1
(1C) (ZY) (2) (CC)
42 31 43 5A 59 32 43 43
H H H H H H H H
1 2
(1B) (ZX) (0) (07)
46 31 42 5A 58 30 30 37
H H H H H H H H
1 2
(1B) (ZY) (0) (08)
46 31 42 5A 59 30 30 38
H H H H H H H H
1 Command "ZY" is a communications
complete report command for description
purpose. The user should select the
communications complete report command.
(:) (1B) (1C)
3A 31 42 31 43
H H H H H
Massage of 6)
1 Station No. for all external devices
general report.
2 Commands "ZX" and "ZY" are commands
for description purposes.
The user should select the command
when the master station communicates
data with slave stations.
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