Mitsubishi LJ61BT11 User Manual page 407

App - 43
(2) For remote I/O net mode
LS = BT {27 + (NI
BT: Constant (transmission speed)
Transmission speed 156 kbps 625 kbps 2.5 Mbps 5 Mbps
BT
NI: NI: Final station number (must be a multiple of 8)
Final station number 1 to 8
NI
N: Number of connected modules
ni: Total number of occupied stations
ST: Constant
250 + (ni
RT: Retry processing time (only link scans whose slave stations became
abnormal are added)
α + β
α: Retry processing time on the first station
BT
R: 13.2 + (NI
β: Retry processing time on the second and subsequent stations
BT
P: 10.8
F : Return processing time (only stations with communication errors are
added)
BT
(Example) Using the following system configuration when the transmission speed
is 10 Mbps (assuming that there is no faulty station or retry)
Station
number 1
Master
Remote
station
I/O station
1: (occupies 1 station)
BT = 0.8
NI = 3 8
N = 3
ni = 3
LS = 0.8 {27 + (8
= 415.84 [μ s]
= 0.42 [ms]
4.8) + (N 30) + (ni
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
10)
(number of stations with communication error detected – 1)
(778.5 + R 3)
4.8)
(778.5 + P 3)
243.1 + ST
Station
1 number 2 1 number 3
Remote
I/O station I/O station
ST = 250 + (ni
= 250 + (3
= 280
4.8) + (3 30) + (3
4.8)} + ST + RT + F [μ s]
10 Mbps
1.6 0.8
32 40 48
Station
1
Remote
10)
10)
4.8)} + 280
APPENDIXES
56 64
App - 43