Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 99

3 SPECIFICATIONS
K = KM6
M
Transfer source module
Main base unit
Main base unit
Extension base unit
Extension base unit
3 - 45
(2) Transmission delay time between multiple networks using the inter-
link data transfer function
The following shows the cyclic transmission delay time for the case where link
device data are transferred to another network with the interlink transfer function.
[Inter-link data transfer]
(Transmission delay time)
+ 
T = (S ) + (LS
D T T
(Transmission delay time)...For Universal model QCPU
+ 
T = (S ) + (LS
D T T
S : Scan time of the sending station (except link refresh time)
T
S : Scan time of the receiving station (except link refresh time)
R

: Link refresh time of the transmitting station
T

: Link refresh time of the relay station and the sending station (for transfer)
MT

: Link refresh time of the relay station and the receiving station (for transfer)
MR

: Link refresh time of the receiving station
R
LS : Link scan time of the sending station
T
LS : Link scan time of the receiving station
R
K : Transmission processing time of the CPU module of the relay station
M
1: Total for the network modules mounted
LB
+ LW 1000 + KM7 [ms]
16
LB : Total of transfer source LB points that are set with interlink transmission
parameters.
LW : Total of transfer source LW points that are set with interlink transmission
parameters.
KM6 : Constant
KM7 : 4.5 (Worst value: 60)
Module location
Transfer target module
Main base unit
Extension base unit
Main base unit
Extension base unit
POINT
Although KM7 is usually 4.5ms, it can be 60ms if monitoring or a dedicated
instruction is executed from GX Developer or any other station.
Depending on the monitoring timing from GX Developer or another station, the time
may be longer than that.
If the time increase may cause a system problem, use link direct devices in the
sequence program to transfer data.
1) +  + 
+ K
T MR M MT
1) +  
(LS
T MR + MT +
MELSEC-Q
2) + 
+ (LS 1) + (S
R R
2) + 
1) + (S [ms]
R R R
1
1
KM6 ( 10
6.7
10.00
10.00
12.00
[ms]
R
1
1
-3
)
3 - 45