Link Scan Time - Mitsubishi Electric CC-Link IE Basic Reference Manual

Link scan time

Use the following formulas to calculate the link scan time.
MELSEC iQ-R, MELSEC-Q/L
Use the following formula to calculate the link scan time (Ls).
*1
Ls = Ns + Nm
Nm = KM1 + (KM2  (N - 1))
Item
Ls
Ns
Nm
N
KM1, KM2
*1 When a timeout or disconnection has been detected, the timeout time set in the link scan setting parameter will be the link scan time.
( Page 24 No response received from a slave station)
*2 The time indicates the reference response time of the slowest slave station among all of the connected slave stations. Note, however,
that the timeout time set in parameter will be the processing time of the slave station when a timeout occurs.
■Constant values
The following table lists the constant values for each series.
Constant
KM1
KM2
*1 When the number of connected slave stations increases, the value may be doubled (0.44) at most.
MELSEC iQ-F
Use the following formula to calculate the link scan time (Ls).
*1
Ls = SM + n1
n1 = Value obtained by rounding up the calculated value of ((Ns + Nm)  SM) to the nearest whole number
Item
Ls
SM
Ns
Nm
*1 When a timeout or disconnection has been detected, the timeout time set in the link scan setting parameter will be the link scan time.
( Page 24 No response received from a slave station)
*2 The time indicates the reference response time of the slowest slave station among all of the connected slave stations. Note, however,
that the timeout time set in parameter will be the processing time of the slave station when a timeout occurs.
*3 The time depends on the processing time of programs. ( Page 29 MELSEC iQ-F)
APPX
56
Appendix 2 Processing Time
Description
Link scan time [ms]
Processing time required for the slave station to respond to a request from the master station (reference response time)
Processing time required for the master station to send a request upon receiving a response from the slave station [ms]
Number of slave stations connected
Constant ( Page 56 Constant values)
Constant value
MELSEC iQ-R MELSEC-Q
6.66 6.66
*1
0.22 0.22
Description
Link scan time [ms]
Sequence scan time [ms]
Processing time required for the slave station to respond to a request from the master station (reference response time)
Processing time required for the master station to send a request upon receiving a response from the slave station
MELSEC-L
L02CPU, L02CPU-P L06CPU, L06CPU-P, L26CPU, L26CPU-P,
L26CPU-BT, L26CPU-PBT
6.8 6.7
0.42 0.38
*2
[ms]
*2
[ms]
*3
[ms]