Specifications

App - 86
Appendix 9.2.2 Block guarantee of cyclic data per station
By enabling the parameter settings shown below, the link data block is guaranteed for
each station through the cyclic data handshaking (to prevent link data separation per
station*
1
).
As shown below, set the send and receive parameters as needed.
These settings can be made using the common parameters (supplementary settings)
only for the control station.
• Default: Disabled
Network range assignments Supplementary settings
By selecting both [Secured data send] and [Secured data receive], an interlock for the
link data between the stations to be set becomes unnecessary.
Network module LW
CPU module
device W
Refresh A
Refresh B
Updated portion
of refresh A
Refresh C
Updated portion
of refresh B
Updated portion
of refresh C
Station number 1
Station number 2
(Host)
Station number 3
Station number 4
<Precautions>
(1) In order to enable the block guarantee per station, it is necessary to set the refresh
parameters.
(2) It is not necessary to set the block guarantee of cyclic data per station for normal
stations.
(3) When using the device set as the refresh destination by the interrupt program, the
block guarantee per station is disabled.
POINT
• The block guarantee per station applies only to the refresh processing. To use the
direct access (J
designation) of the link devices, the programs should be
interlocked.
• When the block guarantee per station is enabled, the following delay time is added
to the normal transmission delay time if the sequence scan time > link scan time.
At cyclic data receiving : TYP + 1/2 sequence scan added
Max + 1 sequence scan added
At cyclic data sending : TYP + 1/2 link scan added
Max + 1 link scan added
*1: The separation prevention
refers to a prevention of link data with two words precision
(32 bits), such as the current value of the positioning module, from being separated
into new data and old data units due to the cyclic transmission timing.