Siemens SIMATIC TIWAY 1 - Manual (Page 77)

THE TIWAY I NETWORK PORTS
UNILINK HOST ADAPTER 4–3
USER MANUAL
The TIWAY I Local Line interface has the advantage of being more economical
than the modem interface since the media is shielded twisted pair cable, such as
Belden

9860 or Belden 9271. Figure 4–2 shows the TIWAY I bus structure with
the network trunkline cable, which can generally extend up to 25,000 feet with
droplines up to 100 feet in length. Figure 4–3 is a chart showing the maximum
cable distances compared to the number of stations on the TIWAY I network.
NOTE
PM550 CIM users should refer to Appendix C for
different media length factors.
Host
Computer
UNILINK
TIWAY I
UniLink Host Adapter ( MHU)
RS–232–C/RS–423–A
Host Interface Cable
Figure 4–2 TIWAY I Bus Structure