Siemens 500 NIM - Manual (Page 25)

Network Design Considerations 2-7 SIMATIC TIWAY I Series 500 NIM User Manual
The TIWAY I local line network cable consists of a main cable or spine with
droplines or taps for each Secondary. Interrelated network variables having
direct influence upon network performance are:
•
Maximum trunk cable length
•
Cable type
•
Tap length
•
Tap spacing
•
Number of Secondaries
•
Maximum baud rates
Figure 2-2 illustrates the relationship of cable distance to the number of
Secondaries for different baud rates for two types of twisted pair cable. Note
that the cable distance (in thousands of feet) is shown vertically; the
maximum number of units that may be attached is shown horizontally.
Network Cable