Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 51)

OPERATION

AND

APPLICATION

UNILINK HOST

ADAPTER2–41

USER MANUAL

You

can request more than one buffer at a time; however

be sure that the total

combined

length of

each buffer response does not exceed the maximum message

length,

or the ERROR RESPONSE will be returned. The Primitive data must fit

into

one host response I-Frame.

The secondary address, MRSW, Primitive data length, and the Primitive data

will

be returned for

each buffer number requested that meets the response type

condition.

Specifying buffer number 00 is a special case that ignores the value in

the

response type byte. In this case, the HIU will return the buffer number

and

buffer data for the first buffer that has its exception flag set. This allows your

host

application program to receive any exceptions as they occur

Table 2–3 describes the meaning for the different values of the MRSW. If the

macro terminated abnormally, the exception flag will be set and the

Termination

Code will reflect the error

. The exception flag will also be set if the

macro

is explicitly disabled or the secondary device has been disconnected by a

host computer. Refer to Chapter 6 for a more detailed explanation of each

termination

code.

Table 2–3 MRSW Values

MRSW V

alues

(hex)

Description

This macro has not been executed

since the last time it was

enabled.

The number of times a repetitive

macro response has been updated.

ermination Code – the macro is

disabled due to either an error

, an

exception, or an explicit disable.

0000

0001

8000

7FFF

FFFF

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 207 208

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 51

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