Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 100

3 SPECIFICATIONS
CPU type
Q06HCPU
Link refresh time = KM1 + KM2
The link refresh time on the sending station
The link refresh time on the receiving station
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(3) Example of the transmission delay time calculation
The following example calculates the transmission delay time with the following
system configuration and under the following conditions:
(System configuration and conditions)
1) CPU module: Q06HCPU
2) Network type: MELSECNET/H mode
3) Communication speed: 10Mbps
4) Total number of stations: 8 stations (1 control station, 7 normal
5) Number of link device points: LB = 1024 points, LW = 1024 points,
LX = LY = 0 points, SB = SW = 512 points
6) Scan time of the CPU module for all stations: 1 ms
7) The file register is not used.
8) The data inter-link transfer and the transient transmission are not used.
9) The network modules are installed on the basic base unit on all
stations.
<Constants used when network modules are installed on main base unit>
Constant
(a) Link refresh time
(b) Link scan time
Link scan time LS = KB + (0.45
(c) Cyclic transmission delay
Transmission delay time T
stations)
KM1 KM2
-3 -3
(×10 ) (×10
130 0.41
LB + LX +LY + SB
×
16
α = 130 × 10
T
1024 + 0 + 0 + 512
×
0.80 (ms)
α 0.80 (ms)
R
total number of stations)
(LB + LY + (LW
+
= 4.0 + (0.45 8)
1024 + 0 + (1024
+
= 9.776 (ms)
+ 
= S
D1 T
= 1 + 0.80 + (9.776
= 9.39 (ms)
KM3 KM4
-3
) (×10 ) (×10
0.53 250
+ α
+ LW + SW + α
E
-3 -3
+ 0.41 × 10
+ 1024 + 512 + 0 + 0
16
16)
0.001
8
16)
0.001
8
+ (LS 0.5) + (S
T R
0.5) + (1 + 0.80)
MELSEC-Q
KM5
-3 -3
) (×10 )
130
L
+ 
) 1.5
R
15
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