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3
FUNCTION LIST
This chapter describes the functions of the RJ71LP21-25. For details on the functions, refer to the following.
MELSEC iQ-R MELSECNET/H Network Module User's Manual (Application)
Cyclic transmission function
: Available, : Not available
Function name
Cyclic transmission
Communications using LB and
LW
Communications using LX and
LY
Low-speed cyclic transmission
Refresh
Link refresh
Direct access to link devices
Constant link scan
Data assurance
Interlink transmission
Cyclic transmission stop and restart
Transient transmission function
: Available, : Not available
Function name
Transient
Communications within the
transmission
same network
Communications with different
networks
Group transient transmission
Sending messages by using logical channel numbers
Description
Writes data on the link device (LB, LW) of the RJ71LP21-25 and
sends the data to all stations connected in the same network.
Exchanges data between the I/O master station that controls LX
and LY and another station on a one-to-one (1:1) basis.
Collectively sends data that do not require high speed transmission
to another station by using link devices (LB/LW). It has the same
performance as the transient transmission function.
Automatically transfers data between a link device in the
RJ71LP21-25 and a device in the CPU module. Refresh can be
performed on labels as well.
Directly reads/writes link devices (LB/LW/LX/LY/SB/SW) of the
RJ71LP21-25 using a program.
Keeps the link scan time at the level of the setting time.
Assures the cyclic data integrity in units of 32 bits or station-based
units.
Transfers data in the link devices of the RJ71LP21-25 to another
network module on a relay station.
Between MELSEC iQ-R series modules, high-speed interlink
transmission is performed without going through the CPU module.
Starts/Stops cyclic transmission in the specified station using
MELSECNET diagnostics or a program. Transient transmission
does not stop.
Description
Performs the transient transmission to other stations using
dedicated instructions and the engineering tool.
Performs the transient transmission seamlessly to stations on
different networks using dedicated instructions or the engineering
tool.
Sends data to all stations of the same transient transmission group
number with a single instruction by dividing the transient
transmission target stations into groups.
Sends messages by using logical channel numbers.
This function is used to receive only the messages selected on the
receiving station when they have a lot of information types.
Availability
Control
Normal
station
station
Availability
Control
Normal
station
station
3 FUNCTION LIST
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