Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 96

3 SPECIFICATIONS
3 - 42
(e) Link scan time in the optical loop system and coaxial bus system
The link scan time in the optical loop system and coaxial bus system is
obtained by the equation below using the following variables:
• Network type
• Number of assignment points of the link device
• Number of connected stations
1) MELSECNET/H mode
a) With a communication speed of 10Mbps
[Link scan time]
LS = KB + (0.45 total number of stations) +
b) With a communication speed of 25Mbps
[Link scan time]
LS = KB + (0.40 total number of stations) +
LS : Link scan time
KB : Constant
Total number of
1 to 8
stations
KB 4.0
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))
1: Total link device points set up in Network range assignment.
Note that the points assigned to reserved stations are excluded.
2: The total transfer time when transient transmissions are simultaneously
executed from multiple stations.
REMARK
For the link scan time in MELSECNET/10 mode, refer to For QnA/Q4AR
MELSECNET/10 Network System Reference Manual.
+ (T
+ (T
9 to 16 17 to 24 25 to 32 33 to 40 41 to 48 49 to 56 57 to 64
4.5 4.9 5.3
1
1
1
1
2
MELSEC-Q
LB + LY + (LW 16)
8
0.001) + (F 4) [ms]
LB + LY + (LW 16)
8
0.0004) + (F 4) [ms]
5.7 6.2 6.6
Refer to Section
3.3.3.
0.001
0.0004
7.0
3 - 42