Appendix 4 Data Link Processing Time; Appendix 4.1 Link Scan Time - Mitsubishi LJ61BT11 User Manual

Appendix 4 Data Link Processing Time

Appendix 4.1 Link scan time

App - 40
This chapter explains the data link processing time such as the link scan time and
transmission delay time.
The retry processing time (RT) and return processing time (F), which are included in
the expression, do not need to be added if all CC-Link system stations are correctly
data-linked.
This section explains the CC-Link scan time. The following describes the method for
calculating the normal value and maximum value for the remote net mode or remote
I/O net mode.
[Link scan time (LS)]
(1) For remote net mode
LS = BT {27 + (NI
TR} + ST + EX + RT + F (μ s)
BT: Constant (transmission speed)
Transmission speed 156 kbps 625 kbps 2.5 Mbps 5 Mbps
BT
NI: The final station number in A, B and C
(It includes the number of dedicated stations but excludes the
reserved stations, and must be a multiple of 8.)
A: Last station number of remote I/O stations
B: Last station number of remote device stations (including the
number of occupied stations)
C: Last station number of local, standby master and intelligent device
stations (including the number of occupied stations)
NW: The final station number in B and C
(Includes the number of dedicated stations but excludes the reserved
stations, and must be a multiple of 8.)
Final station number 1 to 8
NI, NW
N: Number of connected stations (excluding reserved stations)
ni: a + b + c (excluding reserved stations)
a: Total number of occupied stations for remote I/O stations
b: Total number of occupied stations for remote device stations
c: Total number of occupied stations for local stations, standby
master station and intelligent device stations
nw: b + c (excluding reserved stations)
TR: Transient processing time (only when a transient request is made)
When there is a transient request from the master station
180
When there is a transient request from the local station
40.8
4.8) + (NW 9.6) + (N
51.2 12.8 3.2
9 to 16 17 to 24 25 to 32 33 to 40 41 to 48 49 to 56 57 to 64
8 16 24
number of transient transmission stations
30) + (ni 4.8) + (nw
10 Mbps
1.6 0.8
32 40 48
APPENDIXES
9.6) +
56 64
App - 40