User`s manual

344
6. The master station that received the communications complete report transmits a response to the
slave station that transmitted the communications complete report.
7. After completion of step 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.
*1
*1
31H 42H 31H 43H
31H 42H 31H 43H 5AH 59H 43H 43H32H3BH
3AH
(1B) (1C) (ZY) (CC)(2)(;)
(1B) (1C)(:)
Transmission destination station No. Transmission source station No.
Transmission destination station No. Transmission source station No.
Command Message wait Sum check code
Massage of 5
External device of
slave station to
perform the
communications
complete report
(1CH)
Master station
external device
(1BH)
Massage of 6
Command "ZY" is a communications complete
report command for description purpose.
The user should select the communications
complete report command.
*2
*2
*1
*1
31H 46H 31H 42H 5AH 58H 30H 37H30H3BH
31H 46H 31H 42H 5AH 59H 30H 38H30H3BH
(1F) (1B) (ZX) (07)(0)(;)
(1F) (1B) (ZY) (08)(0)(;)
External device of
master station that
obtained the line
usage right (1BH)
External device of
master station that
transmits
communications
complete report
(1BH)
Transmission destination station No. Transmission source station No. Command Message wait Sum check code
Transmission destination station No. Transmission source station No. Command Message wait Sum check code
Station No. for all external devices general report.
Commands "ZX" and "ZY" are commands for description purposes.
The user should select the command when the master station
communicates data with slave stations.
*1
*2