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1 OVERVIEW
MELSEC-QnA
1.1 How to Use This Manual
The master/local module has the following functions added from the function version B
or later. The detailed descriptions of the additional functions are provided in Chapter 14
or later.
(1) Scan synchronous function
Link scan can be executed synchronized with the sequence scan.
(2) Standby master function
With this function, the data link can be continuously executed even if an error
occurs in the master station, by automatically switching to the standby master
station.
(3) Dedicated instructions
Transient transmission with the intelligent device and local station is possible.
In addition, read/write of data with handshake to/from the remote device is
feasible.
(4) Temporary error invalid station specification function
By specifying the corresponding remote station as a temporary error invalid
station, an error is not detected even if the module is replaced while in
communication.
(5) Parameter registration function
Parameters such as total number of connected stations and station information
can be set using dedicated instructions.
(6) Automatic refresh function
Data transferred by cyclic transmissions, such as RX and RY, can be refreshed
by the END processing to a desired device, when set up with the dedicated
instruction.
(7) Monitor/diagnosis function
Monitoring and diagnosing can be performed from a peripheral device.
(8) Online test function
Line testing and control of link such as starting up and stopping can be
performed from a peripheral device.
(9) Communication instruction (software version J manufactured in
Jan., 1998 or later)
Data communication with other stations is possible. Data read/write with other
stations is also possible.
(10) Dedicated instruction (software version J manufactured in Jan.,
1998 or later)
Device read/write with respect to the CPU of the specified station are possible.
(11) Remote I/O net mode (software version P manufactured in Sep.,
1998 or later)
When the system is configured only with the master station and the remote I/O
stations, the setting of the network parameters is eliminated and the link
scanning time is shortened by the use of the remote I/O net mode.