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8 PROGRAMMING
MELSEC-QnA
8.4.2 Link special register (SW)
SW0000 to SW003F are stored in the sequence program, and SW0040 to SW00FF
are automatically stored.
The value in the ( ) next to the number indicates the buffer memory address.
When using a master/local module as a standby master station, refer to the respective
columns under "Availability" in the table as explained below.
• When a standby master station is operating as a master station: "Master station"
column
• When a standby master station is operating as a standby master station: "Local
station" column
Table 8.2 Link special register list
Availability
(
: available,
: not available )
Online
Number Name Description
Master
station
Local
station
Offline
SW0003
(603
H)
Multiple temporary error
invalid station specification
Selects whether to specifies multiple temporary error invalid stations:
00 : Specifies multiple stations as indicated in SW0004 to
SW0007.
01 to 64 : Specifies a single station from 1 to 64.
Specifies the station number used as the temporary error invalid station.
Specifies the temporary error invalid station.
0 : Not specified as a temporary error invalid station.
1 : Specified as a temporary error invalid station.
SW0004
(604
H)
SW0005
(605
H)
SW0006
(606
H)
SW0007
(607
H)
Temporary error invalid
station specification
1
1
SW0004
b0
1 to 64 in the table indicates station numbers.
2
b1
3
b2
4
b3
to
to
13
b12
14
b13
15
b14
16
b15
17
SW0005
18
1920
to
2930
3132
33
SW0006
3435
36to
45
4647
48
49SW0007
5051
52to61626364
SW0008
(608
H)
Line test station setting
Sets the station to perform line tests.
0 : Entire system (performed for all stations)
01 to 64 : Specified station Default value : 0
SW0009
(609
H)
Watchdog time setting
Sets the response monitoring time for transient transmission.
Default value : 5 (s)
Setting range : 0 to 360 (s)
When a value out of the range is set, the value will be set to 360 seconds.
SW000A
(60A
H)
CPU watchdog time
setting
Sets the CPU watchdog time when an access to CPU is gained through
the AJ65BT-G4 using the dedicated instructions.
Default value : 5 (s)
Setting range : 0 to 3600 (s)
If a value out of the range is set, the value will be set to 3600s.
Note: Set on the CC-Link master station or local station connected to the
applicable CPU.
SW0020
(620
H)
Module status
Stores the status of communications between the master/local module
and the CPU module.
0 : Normal
Other than 0 : Stores error code (Refer to the manual for the CPU
module used.)
SW0041
(641
H)
Data link restart result
Stores the execution results of the data link restart specification by
SB0000.
0 : Normal
Other than 0 : Stores error code (Refer to Section 13.3.)
SW0043
(643
H)
Master station switch data
link start result
Indicates the switch specification execution result and stores the
execution results of the master station switch data link start specification
by SB0001.(Usable on standby master station)
0 : Normal
Other than 0 : Stores error code (Refer to Section 13.3.)
SW0045
(645
H)
Data link stop result
Stores the execution results of the data link stop specification by SB0002.
0 : Normal
Other than 0 : Error code (Refer to Section 13.3.)
: Link special relay added to the function version B or later
1 : Turns on only the bit for the head station number.