4
FUNCTIONS
4.1 Cyclic Transmission Function
4.1.4 Direct access to link devices
4
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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) Operation in instruction execution
(a) Direct access on the sending side
1) When near step 0
Direct access is faster than link refresh by up to one sequence scan time.
2) When near END
Direct access functions almost in the same way as link refresh.
Figure 4.16 Link refresh
Figure 4.17 Direct access
Figure 4.18 Link refresh
Figure 4.19 Direct access
0
END
0
END
Sequence scan
Link scan
B0
0
END
0
END
Sequence scan
Link scan
Same as completion status
of END processing
J1\B0
B0
0
END
0
END
Sequence scan
Link scan
J1\B0
0
END
0
END
Sequence scan
Link scan
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