ADSREADINDEX

The function block registers ADSREAD Requests at a PLC task as Indications and allows them to be processed. The queuing of an Indication is reported at the VALID output port by means of a rising edge. The Indication is reported as processed via a positive edge at the CLEAR input. A negative edge at the CLEAR input releases the function block for processing further Indications. After an Indication has been processed a response must be sent to the source device via the ADSREADRES function block. The PORT and NETID parameters can be used to address the source device for this purpose. The INVOKEID parameter is used by the source device to assign the responses to the requests and is also sent back to the source device as a parameter.

This way, requests are filtered and only desired areas are responded to.

There are 16 freely selectable ranges available:
0x80000000 - 0x80FFFFFF
0x81000000 - 0x81FFFFFF

…

0x8E000000 – 0x8EFFFFFF
0x8F000000 – 0x8FFFFFFF

To specify such a range of the index group at an Indication function block, the index group value with which the selected range begins is specified at input MINIDXGRP.
Example: With MINIDXGRP:=16#85000000 all requests are filtered and requests with an index group in the range 0x85000000 - 0x85FFFFFF are registered as Indication.

Inputs

VAR_INPUT
    CLEAR      : BOOL;
    MINIDXGRP  : UDINT;
END_VAR

Outputs

VAR_OUTPUT
    VALID    : BOOL;
    NETID    : T_AmsNetId;
    PORT     : T_AmsPort;
    INVOKEID : UDINT;
    IDXGRP   : UDINT;
    IDXOFFS  : UDINT;
    LENGTH   : UDINT;
END_VAR