Siemens SIMATIC TIWAY 1 User Manual page 17

OPERATION AND APPLICATION
The following operational modes include the NM function. However, the
MHIU/EHA mode does not provide access to the NM command set.
D
Master Host Interface Unit (MHIU)
D
Network Manager (NM)
D
Standalone Network Manager (SANM)
D
Master Host Interface Unit/Emulate Host Adapter (MHIU/EHA)
2.3.3 The Master Host Interface Unit Mode
The Master Host Interface Unit (MHIU) is a combination of the HIU and NM
functions as shown in Figure 2–6. A host computer connected to an MHIU can
communicate with secondary devices through the HIU function and control
network performance through the NM function. Remember, only one adapter in
a TIWAY I network may have the NM function.
Figure 2–6 Master Host Interface Unit Diagram
HIU
MHIU
2–7
NM
UNILINK HOST ADAPTER
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