ABB S800 Product Manual page 144

Calculation of Maximum Distance of an Optical ModuleBus Configuration Section 3 Technical Data
AC800
Figure 60. Example of worst case delay configuration
Calculation of the ModuleBus delay for the configuration in
ModuleBus delay = (total delay in optical fiber) + 5 x (opto-to-opto delay in
TB820/TB820V2) + 2 x (delay in TB825) + (opto-to electrical delay in
TB820/TB820V2) = (4 x 15 + 3 x 1.5 + 1000) x 0.01 + 5 x 4 + 2 x 2.4 + 6.5 = 42 µs.
144
LF
15 m
TB820
LF
15 m
TB820
LF
15 m
TB820
LF
15 m
TB820
LF
1.5 m
TB820
LF
1.5 m
TB825
I/O
I/O
I/O
LF = Local fiber
FF = Field fiber
E = Electrical Modulebus
I/O
I/O
LF
1.5 m
FF
TB825
1000 m
E
TB820 I/O
Figure 60:
3BSE015969-600 A