Appendix 3 Data Link Processing Time; Appendix 3.1 Link Scan Time - Mitsubishi Electric Q81BD-J61BT11 User Manual

APPENDIX

Appendix 3 Data link processing time

Appendix 3.1 Link scan time

App - 30
This chapter explains the data link processing times such as the link scan time and
transmission delay time.
This section shows the CC-Link scan time calculation method.
[Link scan time (LS)]
LS = BT {29.4 + (NI
ST + F [s]
BT: Constant (transmission rate)
Transmission rate
BT
NI: The final station number among a, b and c
(This value includes the number of occupied stations but excludes reserved
stations, and must be a multiple of 8.)
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: The final station number between b and c
(This value includes the number of occupied stations but excludes reserved
stations, and must be a multiple of 8.)
Final station number
NI, NW
N: Number of connected stations (excluding reserved stations)
ni: a + b+ c (excluding reserved stations)
nw: b + c (excluding reserved stations)
ST: Constant
(Must be the largest value among 1) to 3) below. However, 2) is
disregarded when b = 0 and 3) is disregarded when c = 0.)
1) 800 + (a
2) 900 + (b
3) When c < 26: 1200 + (c
When c > 26: 3700 + {(c - 26)
F: Return processing time {only when there is a faulty station (including error
invalid and temporary error invalid stations)}
Number of faulty stations
4.8) + (NW 9.6) + (N
156 kbps 625 kbps 2.5 Mbps
51.2 12.8
1 to 8 9 to 16 17 to 24
8 16 24
15)
50)
100)
25}
48 BT
32.4) + (ni 4.8) + (nw
5 Mbps 10 Mbps
3.2 1.6 0.8
25 to 32 33 to 40 41 to 48
32 40 48
(retry count)
MELSEC
9.6)} +
49 to 56 57 to 64
56 64
App - 30