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7 DATA LINK PROCEDURE
MELSEC-QnA
No. Name Description
Sets the operation condition (setting at shipment: All is OFF)
Setting valid/not valid
Number
Setting detail Description
x Master
station
x Standby
master
station in
controlling
the
system
x Local
station
x Standby
master
station on
standby
SW1
Station type
OFF : Master station/Local station
ON : Standby master station
(Valid) (Valid)
SW2
(Unusable) Always off – –
SW3
(Unusable) Always off – –
SW4
Input data status of the
data link error station
OFF : Clear
ON : Hold
Valid Valid
Number of
occupied stations
SW5 SW6 – –
1 station OFF OFF
2 stations 3 OFF ON
3 stations 3 ON ON
SW5
SW6
Number of occupied
station
4 stations ON OFF
Invalid Valid
SW7
(Unusable) Always off – –
5
Condition setting switch
AJ61QBT11
ONOFF
S MSTM / L
HOLDCLEAR
3/41/2
SW
1
2
3
4
5
6
7
8
ON
1/4
2/3
A1SJ61QBT11
12345678
O N
1
2
3
4
5
6
7
8
M / L
CLR
1/2
S. N
HLD
3/4
SW OFF ON
1/4 2/3
SW8
(Unusable) Always off – –
6
Terminal block
10
8
6
4
2
9
7
5
3
1
NC
DA
NC
(FG)
SLD
NC
NC
NC
DB
DG
Connect the CC-Link dedicated cable for data link.
Refer to Section 7.5 for how to connect the cables.
Note that the following terminals are connected inside of the module.
SLD (terminal No.8) — FG (terminal No.10)
NC (terminal No.7) — NC (terminal No.9)
2-piece type terminal block. The module can be exchanged with another without removing
the signal lines from the terminal block. (Replace the module after turning off its power.)
3 The AJ61QBT11 of hardware version F or later and the A1SJ61QBT11 of hardware version G or later are compatible with this setting.
For other than the above, only SW5 is used to set the number of occupied stations.
OFF: 1 station occupied
ON : 4 stations occupied
Keep SW6 OFF as it is unusable.
POINT
The setting of switches
2
to
5
become valid after the module power supply is turned on from
off or after the programmable controller CPU is reset.
When the setting is changed while the module power supply is on, turn off and then on the
module power supply or reset the programmable controller CPU again.
Important
Do not use station number 64 in a system where the standby master station exists.
When it is used, the station number 64 will not communicate correctly.