Block Guarantee Of Cyclic Data Per Station - Mitsubishi Electric QJ71LP21 Reference Manual

6 PROGRAMMING

6.2.2 Block guarantee of cyclic data per station

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By enabling the parameter settings shown below, handshaking for the cyclic data is
performed between the CPU and the network module and then the network is refreshed.
Through the cyclic data handshaking, the link data block is guaranteed for each station
(to prevent link data separation per station
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
By selecting both [Secured data send] and [Secured data receive], an interlock for the
link data between the stations to be set becomes unnecessary.
CPU module device W
Updated portion
Refresh A
of refresh A
Updated portion
Refresh B
of refresh B
Updated portion
Refresh C
of refresh C
<Precautions>
(1) In order to enable the block guarantee per station, it is necessary to set the
refresh parameters. (See Section 5.1.5.)
(2) It is not necessary to set the block guarantee of cyclic data per station for remote
I/O stations.
POINT
• 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
At cyclic data sending
1).
Supplementary settings
Network module LW
Station number 1
Station number 2
(Host)
Station number 3
Station number 4
: TYP + 1/2 sequence scan added
Max + 1 sequence scan added
: TYP + 1/2 link scan added
Max + 1 link scan added
MELSEC-Q
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