127
APPENDICES
A
Appendix
3 Dat
a
Link Proc
essing T
im
e
Appendix
3.
2 P
roces
sing t
ime
of
CC-Link
Appendix 3.2
Processing time of CC-Link
This section describes the link scan time of CC-Link.
BT: Constant (transmission speed)
NI: Last station number of A and B (The number of occupied stations is included and reserved stations are excluded.
The number needs to be a multiple of 8.)
• A: Last station number of remote I/O stations
• B: Last station number of remote device stations (including the number of occupied stations)
NW: Last station number of remote device stations (The number of occupied stations is included and reserved stations
are excluded. The number needs to be a multiple of 8.)
N: Number of connected stations (excluding reserved stations)
ni: a + b (excluding reserved stations)
nw: b
• a: Total number of occupied remote I/O stations
• b: Total number of occupied remote device stations
ST: Constant (The constant is the larger of the following two values: 1) and 2). However, when B is equal to 0, ignore
the value of 2).)
• 1) 800 + (A
15)
• 2) 900 + (B
50)
RT: Retry processing time (Only the time for the link scan that has found data-linked slave stations to be faulty is
added.)
+
(number of stations in which a communication error has been detected - 1)
: Retry processing time for the first station
• BT
(200 + R)
Retry count set value + 178.5
• R: 13.2 + (NI
4.8) + (NW
9.6)
: Retry processing time for the second and succeeding stations
• BT
{(200 + P)
Retry count set value + 178.5}
• P: 10.8
F: Return processing time (This is added only when there are communication faulty stations.)
BT
{243.1 + 210.8
(number of automatic return stations - 1)} + ST
Calculation formula
LSc = BT
{27 + (NI
4.8) + (NW
9.6) + (N
30) + (ni
4.8) + (nw
9.6)} + ST + RT + F[
s]
Transmission
speed
156kbps
625kbps
2.5Mbps
5Mbps
10Mbps
BT
51.2
12.8
3.2
1.6
0.8
Last
station
number
1 to 8
9 to 16
17 to 24
25 to 32
33 to 40
41 to 48
49 to 56
57 to 64
NI, NW
8
16
24
32
40
48
56
64
Содержание NZ2GF-CCB
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