Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 97

3 SPECIFICATIONS
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2) MELSECNET/H Extended mode
a) With a communication speed of 10Mbps
[Link scan time]
LS = KB + (0.45
b) With a communication speed of 25Mbps
[Link scan time]
LS = KB + (0.40
LS : Link scan time
KB : Constant
Total number of
1 to 8
stations
KB
n
Number of bytes sent by station No. (i)
SP=
i=1
n=Total number of stations
Number of bytes sent = {(LY + LB) / 8 + (2 x LW)}
1: The number after the decimal point is rounded up. 0 is handled as 1.
The calculation example of SP in the setting example
a Setting example
Number of bytes
Station No. sent by each
station
Station No. 1 8000 bytes
Station No. 2 7800 bytes
Station No. 3 0 bytes
Station No. 4 2000 bytes
LB : Total points of link relays (LB) used in all
stations
LW : Total points of link registers (LW) used in all
stations
LX : Total points of link inputs (LX) used in all
stations
LY : Total points of link outputs (LY) used in all
stations
T : Maximum number of bytes sent by the transient transmission in one
link scan.
F : Number of stations returned to the network (Only if there are faulty
stations. : Maximum number of stations returned to the network in 1
scan (set value))
2: Total link device points set up in the network range parameter
assignment.
Note that the points assigned to reserved stations are excluded.
3: "0" when not used.
LB + LY + (LW
SP) +
8
+ (T 0.001) + (F
LB + LY + (LW
SP) +
8
+ (T 0.0004) + (F
9 to 16 17 to 24 25 to 32 33 to 40 41 to 48 49 to 56 57 to 64
4.0 4.5 4.9
2000
b Calculation example of SP
SP=
2
2
2
2
3
16)
0.001
4) [ms]
16)
0.0004
4) [ms]
5.3 5.7 6.2
1
b
a is shown in .
8000 + 7800 0 2000
+ +
2000 2000 2000 2000
0 is handled as 1.
Number after decimal
point is rounded up.
=4 + 4 + 1 + 1
=10
MELSEC-Q
6.6 7.0
Refer to Section
3.3.3.
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