11
PROGRAMMING
11.2 Cyclic Transmission
11.2.1 Station-based block data assurance
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11.2.1 Station-based block data assurance
Block data are assured per station by handshaking between the personal computer and
CC-Link IE Controller Network board, and executing the link refresh.
Station-based block data assurance (link data separation prevention by each station
*1
) is
executed by the handshake of cyclic data.
This function can be set in the "Parameter setting (Supplementary setting)" screen of the
CC IE Control utility, only when the CC-Link IE Controller Network board is the control
station. (It cannot be set if the CC-Link IE Controller Network board is a normal station.)
By selecting [Block data assurance per station is available], an interlock is not needed for
the link data between the setting stations.
*1: The separation prevention refers to a prevention of link data with double words (32 bits), such as
the current value of the positioning module, from being separated to new data and old data in units
of one word (16 bits) due to the refresh timing of cyclic transmission.
POINT
Station-based block data assurance is applied only to the link refresh process.
Set an interlock when using a direct access of link devices.
Data
assurance
Data
assurance
Data
assurance
Data
assurance
Station
number 1
Station
number 2
Station
number 3
Station
number 4
Station
number 1
Station
number 2
Station
number 3
Station
number 4
CC-Link IE Controller Network board,
CC-Link IE Controller Network module
link register (LW)
Personal computer internal buffer,
CPU module link register (W)
Link refresh
