Mitsubishi MELSEC Q Series Reference Manual page 52

(Worst-case transmission delay time: MELSECNET/H mode)
Transmission time (T1) = {(12 + 5 + 10 + 5) 2 + 9 6 + ((2/1) -1) 9 2) + 50} 1
(186 ms)
2 - 26
2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL
(ST · 
T
Simultaneous transient request
Maximum transient request
C24 internal processing time
Causes of transmission time (T1) delay
When a command that takes two scans to send is issued, the transmission time is
twice the value obtained by the above expression.
For the case when another module or programming tool simultaneously requests
access to the same Q/L/QnACPU, refer to REMARKS in Section 2.4.
For details on the network system, refer to the manual for the network system.
POINT
Data transmission to the programmable controller CPU of stations on CC-Link IE
Controller Network, CC-Link IE Field Network, MELSECNET/H, MELSECNET/10
other than the local station may be delayed considerably depending on conditions.
The transmission delay time can be kept short by limiting communication between
an external device and the programmable controller CPU to stations on which the
C24/E71 is loaded and communicating with programmable controllers on other
stations by data link (LB, LM).
· 
· S ) (L )
R R S
(L )
S
2 - 26