Link Data Send/Receive Processing And Processing Time; Link Data Communication Processing; Communication Processing Outline - Mitsubishi MELSEC-A Series Reference Manual

LlNK DATA SEND/RECEIVE PROCESSING
6.
AND PROCESSING TlME
6

LINK DATA SEND/RECEIVE PROCESSING AND PROCESSING TIME

This chapter describes how link data are sent or received in the data link system and it's
processing time.
6.1

Link Data Communication Processing

6.1.1

Communication processing outline

In the data link system, the link data set at the link parameters of the master station is
communicated repeatedly.
(1) Link module configuration
(a) A link module used in a master station or local station has the link data storage
(b) A link module used in a remote I/O station has the link data storage area which
(2) Link data communication
Link data communication includes a link scan and a link refresh.
(a) A link scan is communications of link data between link modules (between link
(b) A link refresh is communications of data link within a link module.
area which communicates the link data to other stations and the data memory
storage area used for processing of the host station.
stores the link data to be communicated to the master station.
data storage areas).
1) Link refresh for a master station or local station is executed when link data is
communicated between the link data storage area and the data memory
storage area.
2) Link refresh for a remote I/O station is executed when link data is
communicated between the link data storage area and the I/O module or
special function module.
Fig 6.1 Link data communications
6 - 1
MELSECNET mode MELSECNET
MELSECNET
MELSECNET
Operating Mode
mode
mode
Applicability
MELSECNET/B
MELSECNET
MELSECNET MELSECNET MELSECNET
composite mode mode mode composite mode