Справочник Пользователя для Mitsubishi Electronics A1SJ71AP23Q
6
- 10
6.2 Transmission Delay Time
6.2.3 Link data send/receive time (Link scan)
6.2.3 Link data send/receive time (Link scan)
6
LINK DATA SEND/RECEIVE PROCESSING AND
PROCESSING TIME
(2) MELSECNET/B data link system
(a) In MELSECNET mode
(b) In MELSECNET II mode
(c) In MELSECNET II composite mode
(d) K, K
L
, and K
R
in the formulas vary depending on the communication speed of the
MELSECNET/B data link system. Obtain values for them from the following table.
(e) Calculate the total link points (number of bytes), and obtain a value for K
B
from the
graph for the set communication speed (one of 1) to 4)).
Table 6.6 Constants (K, K
L
, K
R
)
Communication
speed setting
(bps)
Constant
Total number of slave stations
1 to 8
9 to 16
17 to 24
25 to 31
125k
K
6.7
7.2
7.7
8.2
K
L
3.8
3.8
3.9
3.9
K
R
3.9
3.9
4.0
4.0
250k
K
5.8
6.3
6.8
7.3
K
L
3.1
3.1
3.2
3.2
K
R
3.1
3.2
3.3
3.3
500k
K
5.8
6.3
6.8
7.3
K
L
2.7
2.7
2.8
2.8
K
R
2.9
2.9
3.0
3.0
1M
K
5.8
6.3
6.8
7.3
K
L
2.6
2.6
2.7
2.7
K
R
2.8
2.8
2.9
2.9
LS = K + K
R
(Total No. of remote I/O slave stations) + K
L
(Total No. of local slave stations) + K
B
[ms]
LS = K + K
L
(Total No. of local slave stations + No. of local stations assigned to latter half of link parameters) + K
B
[ms]
LS = K + K
R
(Total No. of remote I/O slave stations) + K
L
(Total No. of local slave stations + No. of local stations assigned to latter half of link parameters) + K
B
[ms]
(Total link points) = {B + X
0
+ Y
0
+ (W 16)} 8192 [Kbyte]