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MELSEC-QnA
15 FUNCTIONS (FUNCTION VERSION B OR LATER)
15.2.1 Network parameters
Network parameters are used for performing data link. The items that are set by the
network parameters are shown in Table 15.2.
Table 15.2 Network parameters
Buffer memory address
Setting item Description
Hex. Dec.
Number of connected
modules
Sets the number of remote stations, local stations, intelligent device
stations, and standby master station connected to the master station.
(Includes reserved stations.)
Default value : 64 (modules)
Setting range : 1 to 64 (modules)
1
H 1
Number of retries
Sets the number of retries during the communication error.
Default value : 3 (times)
Setting range : 1 to 7 (times)
2
H 2
Number of automatic return
modules
Sets the number of remote stations, local stations, intelligent device
stations, and standby master station that can be returned by one
link scan.
Default value : 1 (module)
Setting range : 1 to 10 (modules)
3
H 3
Standby master station
specification
Specifies the station number of the standby master station.
Default value : 0 (0: No standby master station specified.)
Setting range : 0 to 63 (0: No standby master station specified.)
4
H 4
Operation specification
when CPU becomes fault
y
Specifies the data link status when a master station programmable
controller CPU error occurs.
Default value : 0 (stop)
Setting range : 0 (stop)
1 (continue)
6
H 6
Scan mode specification
Specifies the synchronous or asynchronous mode for sequence scan.
Default value : 0 (asynchronous)
Setting range : 0 (asynchronous)
1 (synchronous)
– –
Delay time setting Set 0 for the delay time. 8H 8
Reserved station
specification
Specifies the reserved station.
Default value : 0 (Not set)
Setting range : Turn on the bit corresponding to the station number.
10
H to 13H 16 to 19
Error invalid station
specification
Specifies the error invalid station.
Default value : 0 (Not set)
Setting range : Turn on the bit corresponding to the station number.
14
H to 17H 20 to 23
Station information
Sets the type of the connected remote stations, local stations,
intelligent device station, and standby master station.
Default value : 0101
H (remote I/O station, 1 station occupied, station
number 1) to
0140
H (remote I/O station, 1 station occupied,
station number 64)
Setting range : See below.
Station type
b15
b8
to to b7 to
b0
Occupied
stations
Station No.
1 : 1 station occupied
2 : 2 stations occupied
3 : 3 stations occupied
4 : 4 stations occupied
1 to 64
(01
H
to 40
H
)
b12 b11
0 : Remote I/O station
1 : Remote device station
2 : Intelligent device station
(Local station and standby
master station are included)
20H (first module)
to
5F
H (64th module)
32 (first module)
to
95 (64th module)