ABB S800 Product Manual page 146

Calculation of Maximum Distance of an Optical ModuleBus Configuration Section 3 Technical Data
Figure 61.
For the configuration in
(Total delay in FF) + (Total delay in LF) + 6*(Opto-to-opto delay in
TB820/TB820V2) + 2*(Delay in TB826) + (Opto-to-electrical delay in TB820)
= 5000*0.01 + ((7 * 200)+100)*0.01 + 6*4 + 2*2.0 + 6.5 
= 50 + 1500*0.01 + 24 + 4 + 6.5
= 99.5 µs
146
Example of worst case delay configuration TB826
Figure 61 the Communication link delay is calculated as:
3BSE015969-600 A