Siemens SIMATIC TIWAY 1 User Manual page 18

2.3.4 Typical Network Applications
Both single and multiple host networks are supported by the UNILINK Host
Adapter. Figure 2–7 illustrates a typical single host network which uses an
MHIU as the host interface and network manager.
Multiple host networks can be configured with a variety of adapters in different
operating modes as illustrated in Figure 2–8 and Figure 2–9. Since the NM
function is not in the same adapter with the HIU function in Figure 2–9, the NM
and HIUs can use the total memory resources of the adapters for their
respective needs. This could be an advantage in large networks where the
additional memory for NM buffers will increase network performance.
UNILINK HOST ADAPTER
USER MANUAL
OPERATION AND APPLICATION
Host
Com-
puter
UNILINK
UniLink Host Adapter ( MHU)
Figure 2–7 Typical Single Host Network
RS–232–C/RS–4
23–A
Host Interface
Cable
TIWAY I
2–8