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MELSEC
11 PROGRAMMING
11.2.1 Block guarantee of cyclic data per station
By enabling the parameter settings shown below, handshaking for the cyclic data is
performed between the PC and the MELSECNET/H board 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
1
).
As shown below, set the send and receive parameters as needed.
The MELSECNET/H board can be set in the MNETH utility's "Common Parameter
Setting (Supplementary Settings)" screen only when it is the control station. (It is not
necessary to set it if the board is a normal station.)
By selecting both [Secured data send] and [Secured data receive], an interlock for the
link data between the stations to be set becomes unnecessary.
MELSECNET/H board and
Network module LW
PC and 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
POINT
The block guarantee per station applies only to the refresh processing. To use the
direct access of the link devices, the programs should be interlocked.
1: The separation prevention refers to a prevention of link data with double
word precision (32 bits), such as the current value of the positioning module,
from being separated into new data and old data in one word (16 bits) units
due to the cyclic transmission timing.
Summary of Contents for Q80BD-J71BR11
Page 2: ......
Page 24: ...A 22 A 22 MEMO ...
Page 50: ...4 6 4 6 MELSEC 4 FUNCTION MEMO ...
Page 92: ...6 36 6 36 MELSEC 6 PROCEDURE AND SETTINGS UP TO THE POINT OF OPERATION MEMO ...
Page 132: ...10 2 10 2 MELSEC 10 MELSEC DATA LINK LIBRARY MEMO 10 ...
Page 138: ...11 6 11 6 MELSEC 11 PROGRAMMING MEMO ...
Page 164: ...12 26 12 26 MELSEC 12 APPLICATION FUNCTIONS MEMO ...
Page 166: ...13 2 13 2 MELSEC 13 ERROR CODE MEMO 13 ...
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