Mitsubishi Electric Q80BD-J61BT11N, User Manual

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App - 30 App - 30
MELSEC
APPENDIX
Appendix 3 Data link processing time
This chapter explains the data link processing times such as the link scan time and
transmission delay time.
Appendix 3.1 Link scan time
This section shows the CC-Link scan time calculation method.
[Link scan time (LS)]
LS = BT {29.4 + (NI 4.8) + (NW 9.6) + (N 32.4) + (ni 4.8) + (nw 9.6)} +
ST + F [

s]
BT: Constant (transmission rate)
Transmission rate 156 kbps 625 kbps 2.5 Mbps 5 Mbps 10 Mbps
BT 51.2 12.8 3.2 1.6 0.8
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 1 to 8 9 to 16 17 to 24 25 to 32 33 to 40 41 to 48 49 to 56 57 to 64
NI, NW 8 16 24 32 40 48 56 64
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 15)
2) 900 + (b 50)
3) When c < 26: 1200 + (c 100)
When c > 26: 3700 + {(c - 26) 25}
F: Return processing time {only when there is a faulty station (including error
invalid and temporary error invalid stations)}
Number of faulty stations 48 BT (retry count)