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(2) For remote I/O net mode
LS = BT {27 + (NI 4.8) + (N 30) + (ni 4.8)} + ST + RT + F [s]
BT: Constant (transmission speed)
Transmission
speed
BT
NI: NI: Final station number (must be a multiple of 8)
Final
station
number
NI
N
Number of connected modules
ni
Total number of occupied stations
ST
Constant
250 + (ni 10)
Retry processing time (only link scans whose device stations became abnormal are added)
RT
+ (number of stations with communication error detected - 1)
F
Return processing time (only stations with communication errors are added)
BT 243.1 + ST
Using the following system configuration when the transmission speed is 10 Mbps (assuming that there is
no faulty station or retry)
BT
NI
N
ni
ST
0.8 {27 + (8 4.8) + (3 30) + (3 4.8)} + 280
LS =
= 415.84 [s]
= 0.42 [ms]
434
156kbps
625kbps
51.2
1 to 8
9 to 16
17 to 24
8
16
Retry processing time on the first station
BT (778.5 + R 3)
R: 13.2 + (NI 4.8)
Retry processing time on the second and subsequent stations
BT (778.5 + P 3)
P: 10.8
Station
number 1
Master
Remote
station
I/O station
1: (occupies 1 station)
0.8
38
3
3
ST = 250 + (ni 10) = 250 + (3 10) = 280
2.5Mbps
12.8
3.2
25 to 32
33 to 40
24
32
40
Station
Station
1
number 2
1
number 3
Remote
Remote
I/O station
I/O station
5Mbps
10Mbps
1.6
41 to 48
49 to 56
48
56
1
0.8
57 to 64
64
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Troubleshooting
