Siemens SIMATIC TIWAY 1 Manual do Utilizador descarregar pdf (Página 20)

OPERATION

AND

APPLICATION

UNILINK HOST

ADAPTER 2–10

USER MANUAL

2.3.5 The

Emulate Host Adapter Modes

There are two modes available that provide an emulation of the TIW

Y I Host

Adapter; the MHIU/EHA and the HIU/EHA. These modes are limited to the

base command codes 01 through 08, 20, 21, and FC through FF. The POLL

command,

code 03, is not available in the HIU/EHA mode. Both of these modes

will operate with applications software written for the TIWAY I Host Adapter.

The MHIU/EHA can directly replace the TIWAY I Host Adapter in single host

network applications. However, the MHIU/EHA cannot be used in a multiple

host

network. The HIU/EHA provides the ability to use TIW

Y I Host Adapter

software

applications in a multiple host network.

2.3.6

The Standalone Network Manager Mode

The Standalone Network Manager mode operates independent of any host

computer. It controls the TIWAY I network, but cannot accept any host

commands to change any performance parameters. You can use this mode to

implement

a multiple host network using applications software written for the

TIWAY I Host Adapter. Only minor changes to the applications software are

needed to process the adapter configuration command. A typical network is

shown

in Figure 2–10.

Host

Com-

puter

UNILINK

(HIU)

Host

Com-

puter

UNILINK

(HIU)

UNILINK

(SANM)

Figure 2–10 Standalone NM Network

2.4 TIWAY I HOST SOFTWARE SUPPORT

As mentioned in Paragraph 2.3.5, the MHIU/EHA and HIU/EHA modes will

operate with the TIWAY I HOST SOFTWARE products. The MHIU and NM

modes

will also work with this product; however

, you must enclose the extended

and

NM commands in the XP

AR subroutine.

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