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6.2 Transmission Delay Time
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 KR 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, KL, KR)
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
KL 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
KL 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
KL 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
KL 2.6 2.6 2.7 2.7
K
R 2.8 2.8 2.9 2.9
LS = K + KR (Total No. of remote I/O slave stations) + KL (Total No. of local slave stations) + KB [ms]
LS = K + KL (Total No. of local slave stations + No. of local stations assigned to latter half of link parameters) + KB [ms]
LS = K + KR
(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 + Y0 + (W 16)} 8192 [Kbyte]