Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 378

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18 DATA COMMUNICATIONS BETWEEN TARGET DEVICE AND CPU MODULE IN M:N BASIS
18.3 Examples of Procedure for Data Communications with CPU Module
 The master station that received the communication complete report transmits a response to the slave station that
transmitted the communication complete report.
Ex.
 After the completion of  above, or when the line usage time of the slave station that obtained the line ownership exceeds
the maximum data communication time,
• The master station waits for a communication request from a slave station.
When the master station receives a communication request, it performs processing from .
• The slave stations do not communicate data with the master station until data communication with the CPU module is
required.
When data communications with the CPU module is required, they perform the processing from .
 When the master station itself communicates data with the CPU module, it transmits all devices excluding the CPU module
station a general report data and obtains the line ownership before communicating data with the CPU module while slave
stations do not have the line ownership.
After data communications with the CPU module were completed, the master station transmits general report data to inform
the slave stations that data communications with the CPU module are completed.
During this time, the slave stations do not communicate data with the master station until master station data communications
have been completed.
Ex.
31H 42H 31H 43H
31H 42H 31H 43H 5AH 59H 43H 43H32H3BH
3AH
(1B) (1C) (ZY) (CC)(2)(;)
(1B) (1C)(:)
(1BH)
(1CH)
*1
*1
Command "ZY" is a communications complete report command for description purpose.
The user should select the communications complete report command.
Massage of Ö
Massage wait Transmission destination station No. Transmission source station No.
Command
Sum check code
Target device of
slave station to
perform the
communications
complete report
Transmission destination station No. Transmission source station No.
Master station
target device
Massage of
×
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)(;)
*1 *2
*1
*2
Station No. for all target devices
general report.
Message wait
Transmission destination station No.
Transmission source station No.
Command
Sum check code
Commands "ZX" and "ZY" are commands
for description purposes.
The user should select the command
when the master station communicates
data with slave stations.
Target device of
master station that
obtained the line
ownership (1BH)
*1 *2
Message wait
Transmission destination station No.
Transmission source station No.
Command
Sum check code
Target device of
master station that
transmits
communications
complete report
(1BH)