MC_AxAdsReadDecoder_BkPlcMc (from V3.0)

The function block decodes ADS read accesses. The ADS codes are listed in the Knowledge Base.

Inputs

VAR_INPUT
    nFirstAxisIndex:    INT;
    nLastAxisIndex:     INT;
    bReset:             BOOL;
    bValid:             BOOL;
    sNetId:             STRING(80);
    nPort:              UINT;
    nInvokeId:          UDINT;
    nIdxGroup:          UDINT;
    nIdxOffs:           UDINT;
    cbReadLen:          UDINT;
    pAxItf:             POINTER TO Axis_Ref_BkPlcMc:=0;
END_VAR

Name	Type	Description
nFirstAxisIndex	INT	This parameter is used to specify the dimensioning of the Axis_Ref_BkPlcMc array. An incorrect specification at this point excludes some of the axes from the communication or results in a crash of the PLC application by triggering serious runtime errors (Page Fault Exception).
nLastAxisIndex	INT
bReset	BOOL	The signals are used to co-ordinate the decoder with the ADS server.
bValid	BOOL
sNetId	STRING	These values are required in order to generate the ADS response. They are supplied by an ADS server's ADS indication function block.
nPort	UINT
nInvokeId	UDINT
nIdxGroup	UDINT	These values are required in order to decode the access. They are supplied by an ADS server's ADS indication function block.
nIdxOffs	UDINT
cbReadLen	UDINT
pAxItf	POINTER	Here, the address of a variable or an array of variables of type Axis_Ref_BkPlcMc should be transferred.

Inputs/outputs

VAR_INOUT
    DeadManCount:       UDINT;
END_VAR

Name	Type	Description
DeadManCount	UDINT

Outputs

VAR_OUTPUT
    bClear:             BOOL;
    bPending:           BOOL;
END_VAR

Name	Type	Description
bClear	BOOL	Indicates that an ADS access indicated with bValid should be acknowledged.
bPending	BOOL	Indicates that an ADS access indicated with bValid is being processed.

Behavior of the function block

If, when the bValid signal is present, the function block indicates neither bClear nor bPending it has not decoded the combination of nIdxGroup and nIdxOffs, and has not generated a response. In such a case, the ADS server (if there is one) must call another decoder, or must generate a response with the appropriate error code.