Mitsubishi FX2N-16CCL-M, User Manual

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FX2N-16CCL-M CC-Link System Master Block Data Link Processing Time 6
6-3
6.2 Link Scan Time
The link scan time in the CC-Link system is calculated using the expression below.
Example: When the transmission speed is 2.5 Mbps in the system configuration below
BT = 3.2 ST = 1100
NI = 7
→
8
➀
800 + (3
×
15) = 845
NW = 7
→
8
➁
900 + {(4
×
50) = 1100
a = 3 b = 4
N = 5
ni = 7
nw = 4
LS = 3.2 {29.4 + (8
×
4.8) + (8
×
9.6) + (5
×
32.4) + (7
×
4.8) + (4
×
9.6)} + 1100
= 2311.52 [
µ
s]
= 2.31 [ms]
LS = BT {29.4 + (NI
×
4.8) + (NW
×
9.6) + (N
×
32.4) + (ni
×
4.8) + (nw
×
9.6)} + ST
+ {Number of communication faulty stations
×
48
×
BT
×
Number of retries}* [
µ
s]
BT : Constant (transmission speed)
NI : Last station number in a and b (including the number of occupied stations and
excluding the number of reserved stations)
NW : Last station number in b (including the number of occupied stations and excluding
the number of reserved stations)
N : Number of connected modules (excluding reserved station)
ni : a + b (excluding reserved stations)
nw : b (excluding reserved stations)
ST : Constant (larger value of (
➀
) and (
➁
)) (If b is 0, (
➁
) should be ignored.)
➀
800 + (a
×
15)
➁
900 + (b
×
50)
a : Total number of stations occupied by remote I/O stations
b : Total number of stations occupied by remote device stations
* : Only when there are communication faulty stations (including error invalid stations
and temporary error invalid stations)
Transmission speed 156kbps 625kbps 2.5Mbps 5Mbps 10Mbps
BT 51.2 12.8 3.2 1.6 0.8
Last station Number 1 to 8 9 to 15
NI,NW 8 16
[Link scan time (LS)]
Master
station
Remote I/O
station
Remote I/O
station
Remote I/O
station
Remote device
station
Remote device
station
Station No. 1
*1
Station No. 2
*1
Station No. 3
*1
Station No. 4
*2
Station No. 6
*2
*1: Occupies 1 station. *2: Occupies 2 station.