4
FUNCTIONS
4.1 Cyclic Transmission Function
4.1.5 Assurance of cyclic data integrity
4
- 19
1
O
V
ER
VI
E
W
2
SYST
EM
CO
NF
IG
URA
T
IO
N
3
SPECI
F
IC
A
T
IO
N
S
4
F
UNCT
IONS
5
PREP
ARA
T
IO
N AND
SET
UP
6
P
A
RAM
E
T
E
R
SET
TI
NG
7
PRO
C
ESSI
NG
T
IM
E
8
PRO
G
R
AM
M
ING
4.1.5
Assurance of cyclic data integrity
This function allows cyclic data integrity to be assured in units of 32 bits or stations.
: Data assured,
: Data not assured
POINT
Link scans are performed "asynchronously" with link refresh.
Therefore, when the following cyclic data of 32 bits or more are handled, new and
old data may be mixed in units of 16 bits depending on the link refresh timing.
• Floating point data
• Present value or command speed value of a positioning module
(1) 32-bit data assurance
When the control station's [Network range assignment] is set up with the following
conditions 1) to 4) satisfied, 32-bit data integrity is automatically assured.
1) The start device No. of LB is a multiple of 20
H
.
2) The points assigned per station in LB is a multiple of 20
H
.
3) The start device No. of LW is a multiple of 2.
4) The points assigned per station in LW is a multiple of 2.
Table 4.8 Assurance of cyclic data integrity
Cyclic data integrity
assurance
Link refresh
Direct access to link devices
Direct access
32-bit data assurance
Station-based block data
assurance
Interlock program
Figure 4.24 Timing of link scan and link refresh
Figure 4.25 32-bit data assurance
END
0
END
0
END
0
END
0
Sequence scan
Link scan
Link refresh
Link refresh
Link refresh
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