Siemens SIMATIC TIWAY 1 - Manual (Page 18)

OPERATION AND APPLICATION
UNILINK HOST ADAPTER 2–8
USER MANUAL
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.
Host
Com-
puter
UNILINK
TIWAY I
UniLink Host Adapter ( MHU)
RS–232–C/RS–4
23–A
Host Interface
Cable
Figure 2–7 Typical Single Host Network
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.