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21: D
ATA
L
INK
C
OMMUNICATION
O
PEN
N
ET
C
ONTROLLER
U
SER
’
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M
ANUAL
21-5
Data Link Communication between Master and Slave Stations
The master station has 10 data registers assigned to transmit data to a slave station and 10 data registers assigned to receive
data from a slave station. The quantity of data registers for data link can be selected from 0 through 10 using
WindLDR
.
The following examples illustrate how data is exchanged between the master and slave stations when 2 or 10 data registers
are used for data link communication with each slave station.
Example 1: Transmit Data 2 Words and Receive Data 2 Words
Example 2: Transmit Data 10 Words and Receive Data 10 Words
Master Station
D8400
Communication Error
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
D8401
Communication Error
D7020 - D7021
Transmit Data
D7030 - D7031
Receive Data
D8402
Communication Error
D7040 - D7041
Transmit Data
D7050 - D7051
Receive Data
D8403
Communication Error
D7060 - D7061
Transmit Data
D7070 - D7071
Receive Data
D8429
Communication Error
D7580 - D7581
Transmit Data
D7590 - D7591
Receive Data
D8430
Communication Error
D7600 - D7601
Transmit Data
D7610 - D7611
Receive Data
Slave Stations
D8400
Communication Error
Slave Station 1
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
D8400
Communication Error
Slave Station 2
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
D8400
Communication Error
Slave Station 3
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
D8400
Communication Error
Slave Station 4
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
D8400
Communication Error
Slave Station 30
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
D8400
Communication Error
Slave Station 31
D7000 - D7001
Transmit Data
D7010 - D7011
Receive Data
Master Station
D8400
Communication Error
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
D8401
Communication Error
D7020 - D7029
Transmit Data
D7030 - D7039
Receive Data
D8402
Communication Error
D7040 - D7049
Transmit Data
D7050 - D7059
Receive Data
D8403
Communication Error
D7060 - D7069
Transmit Data
D7070 - D7079
Receive Data
D8429
Communication Error
D7580 - D7589
Transmit Data
D7590 - D7599
Receive Data
D8430
Communication Error
D7600 - D7609
Transmit Data
D7610 - D7619
Receive Data
Slave Stations
D8400
Communication Error
Slave Station 1
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
D8400
Communication Error
Slave Station 2
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
D8400
Communication Error
Slave Station 3
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
D8400
Communication Error
Slave Station 4
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
D8400
Communication Error
Slave Station 30
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
D8400
Communication Error
Slave Station 31
D7000 - D7009
Transmit Data
D7010 - D7019
Receive Data
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