Calculation Of Maximum Distance Of An Optical Modulebus Configuration - ABB S800 Product Manual

Section 3 Technical Data and Performance

Calculation of Maximum Distance of an Optical ModuleBus Configuration

Calculation of Maximum Fibre length for TB825
The maximum signal delay should be calculated in the configuration using Optical
ModuleBus Media Converter. This is calculated using the signal path from the
controller to the point in the configuration that has the longest delay. The maximum
delay in an optical ModuleBus configuration must be  100
S800 I/O HI).
The delay values in
optical ModuleBus configuration.
Opto-to-opto delay in TB825
Opto-to-opto delay in TB820/TB820V2(1)
Opto-to-electrical delay in TB820/TB820V2(1)
Opto-to-opto delay in TB840/TB840A
Opto-to-electrical delay in TB840/TB840A
Delay in optical fiber
(1) Notice that the delays in the table is the sum of the communication delay in both directions, i.e.
(2) Total fiber length = total local fiber length + field fiber length
3BSE015969-600 A
Table 29
Table 29. Delay Values Optical ModuleBus Components
(1)(2)
(delay of master frame) + (delay of slave frame).
Calculation of Maximum Distance of an Optical
can be used to calculate the maximum delay in an
(1)
(1)
(1)
µ
s (less than 250
2.4 µs
4.0 µs
6.5 µs
2.0 µs
5.5 µs
(0.01 x length) µs
s for 
µ
143