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3 the master host interface unit mode, Hiu nm mhiu – Siemens SIMATIC TIWAY 1 User Manual

Page 17

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OPERATION AND APPLICATION

UNILINK HOST ADAPTER

2–7

USER MANUAL

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.

HIU

NM

MHIU

Figure 2–6 Master Host Interface Unit Diagram