User`s manual

11-2
Data link DL9 (master station) function
11
[1] Communication method of the data link DL9
The data link DL9 controls to send data from a master station (JW-32CUM1) to each slave station and to
receive data from each slave station to a master station. Communication between slave stations is not
available.
Slave station 1 Slave station 2 Slave station 3 Slave station 4
Master station
Sending
Receiving
Sending
Receiving
Sending
Receiving
Sending
Receiving
As the data link DL9 communicates through one line of twisted pair shield cable, it is unable to
communicate with all the stations at the same time. The data link DL9 communicates from the No.1 slave
station in order, sharing the time.
[Example] In case of 4 sets of slave stations:
I/O scan of master
station PC
(JW30H: JW-32CUM1)
Slave station 1
Master station
Slave station 2
Slave station 3
Slave station 4
I/O processing I/O processing I/O processing
PC processing PC processing PC processing
Data exchange with PC Data exchange with PC
Slave
station 1
Slave
station 2
Slave
station 3
Slave
station 4
Slave
station 1
Slave
station 1
Slave
station 1
Slave
station 2
Slave
station 2
Slave
station 2
Slave
station 3
Slave
station 4
Receiving Sending
Sending Receiving
Sending Receiving
Sending Receiving
Receiving Sending
Sending Receiving