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6
LINK DATA SEND/RECEIVE PROCESSING AND
PROCESSING TIME
6.1 Link Data Send/Receive Processing
6.1.1 Send/receive processing overview
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CHAPTER6 LINK DATA SEND/RECEIVE PROCESSING
AND PROCESSING TIME
This chapter describes how link data are sent or received in the data link system, and its
processing time.
processing time.
6.1
Link Data Send/Receive Processing
6.1.1
Send/receive processing overview
The data link system repeatedly sends and receives link data set with the link parameters
of the master station.
of the master station.
(1) Link module configuration
A link module has a link data storage area that is provided for link data communication
with other stations, and a data memory storage area that is used for processing of its
own station data.
The link data storage area of a Q series local station uses the buffer memory.
with other stations, and a data memory storage area that is used for processing of its
own station data.
The link data storage area of a Q series local station uses the buffer memory.
(2) Link data transfer
Link data are sent or received by link scan and link refresh.
(a) Link scan means link data transfer between link modules (between the link data
storage areas).
(b) Link refresh is link data transfer performed inside a link module.
1) When using CPU modules with the link function on the master and local
stations
Link data are sent and received between the link data storage area and the
data memory storage area.
Link data are sent and received between the link data storage area and the
data memory storage area.
2) When using a CPU module and a link module (including the local module)
Link data are sent and received between the link data storage area of the link
module and the data memory storage area of the CPU module.
module and the data memory storage area of the CPU module.
Figure 6.1 Link data transfer
Link data
storage area
Link refresh
Data memory
storage area
Link scan
Q series local station
Local module
Link data
storage area
Link refresh
CPU module
Data memory
storage area
Master station
Buffer memory
Buffer memory