Mitsubishi Electric MELSEC Q Series Reference Manual page 253

(2) In the case of a multi-network system
The following shows the cyclic transmission delay time for the case where link device data are transferred to
another network with the interlink transmission function.
Transmission delay time (For other than Universal model QCPUs) =
(ST + T) + (LS ) + MR + KM + MT + (LS
×
1
T
Transmission delay time (For Universal model QCPU) =
(ST + T) + (LS × 1) + MR + MT + (LS
T
ST: Sequence scan time on sending side (excluding link refresh time)
SR: Sequence scan time on receiving side (excluding link refresh time)
T:
Link refresh time on sending side (Total of the number of mounted network modules)
MT: Time for link refresh between relay station and sending side (for transfer) (Total of the number of
mounted network modules)
MR: Time for link refresh between relay station and receiving side (for transfer) (Total of the number of
mounted network modules)
R: Link refresh time on receiving side (Total of the number of mounted network modules)
LS : Link scan time on sending side
T
LS : Link scan time on receiving side
R
KM: Transmission processing time of CPU module on relay station (
LB
KM KM6
16
LB: Total of transfer source LB points that are set with interlink transmission parameters.
( Page 232, Section 6.8)
LW: Total of transfer source LW points that are set with interlink transmission parameters.
( Page 232, Section 6.8)
KM6: Constant
KM7: 4.5 (Worst value: 60)
Transfer source module
Main base unit
Main base unit
Extension base unit
Extension base unit
Although KM7 is normally 4.5ms, when monitoring from the programming tool or another station or an dedicated instruction
is being executed, it will be 60ms.
Depending on monitoring timing from the programming tool or another station, the time will be further increased.
If this time increase could cause a problem in the system, perform interlink transmission by the sequence program using link
direct devices.
×
R
× 1) + (SR × 2) + R [ms]
R
LW 1000 KM7 [ms]
Module location
Transfer target module
Main base unit
Extension base unit
Main base unit
Extension base unit
) + R [ms]
) + (SR ×
1 2
Refer to the following.)
6.7
10.00
10.00
12.00
CHAPTER 7 PROCESSING TIME
-3
KM6 (× 10 )
251
7