Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 32)

OPERATION

AND

APPLICATION

UNILINK HOST

ADAPTER 2–22

USER MANUAL

2.8 MODE INDEPENDENT OPERATIONS

The

mode independent commands perform hardware and software resets,

and

external I/O point operations regardless of the operating modes.

2.8.1

Reset Commands

There

are two reset commands that can be sent to the UNILINK Host Adapter

regardless of the operating mode. The reset commands should be used

cautiously because they clear all macros and configuration parameters, and

discard any outstanding operations on the network. The first is the SOFT

RESET command, code FE. This command causes the adapter to execute a

software

reset operation. All current TIW

Y I operations

will be aborted and the

adapter will go into a startup state without performing power up diagnostics.

The command code will be returned as a response and the reset will begin

immediately

after sending the response to the host. Y

our applications

software

should

not issue another command for at least 500 ms.

The second reset command is the RESET ADAPTER command, code FF. The

reset

will begin within one second after the reset command response is returned

to the host. Your applications software should allow an additional five second

delay

before issuing another command to allow the diagnostics to complete.

The

response to either reset command will not be returned until the adapter is

polled when using the host BDLC protocol. Chapter 3 provides more

information

on host interface protocols.

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 32