Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 15)

OPERATION

AND

APPLICATION

UNILINK HOST

ADAPTER2–5

USER MANUAL

HIU

Establishes communications

Uses memory for:

Macro Buffers

between the host computer

and the secondary devices.

(Dynamically allocated)

Host–to–Secondary Statistics

Figure 2–4 Host Interface Unit Function

Part

of the statistics

memory area is used for a Secondary Log. As commands are

issued

connect and disconnect secondaries, the specified secondary address is

added

or deleted from the Secondary Log and a network request is queued into

the

Network Manager

In the background, the adapter is continuously collecting statistics on the

number of commands processed, transactions completed on the network, and

other items. Commands to retrieve these statistics do not require network

transactions,

but return the information from the appropriate statistical area.

The following operating modes include the HIU function.



Master Host Interface Unit (MHIU)



Host Interface Unit (HIU)



Master Host Interface Unit/Emulate Host Adapter (MHIU/EHA)



Host Interface Unit/Emulate Host Adapter (HIU/EHA)

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 15