ADSREAD

VAR_INPUT

VAR_INPUT
    NETID       : T_AmsNetId;
    PORT        : T_AmsPort;
    IDXGRP      : UDINT;
    IDXOFFS     : UDINT;
    LEN         : UDINT;
    DESTADDR    : DWORD;
    READ        : BOOL;
    TMOUT       : TIME;
END_VAR

NETID : Is a string containing the AMS network identifier of the target device to which the ADS command is directed.

PORT : Contains the port number of the ADS device.

IDXGRP : Contains the index group number (32 bit, unsigned) of the requested ADS service. This value is to be found in the ADS table of the addressed device.

IDXOFFS : Contains the index offset number (32 bit, unsigned) of the requested ADS service. This value is to be found in the ADS table of the addressed device.

LEN : Contains the number, in bytes, of the data to be read.

DESTADDR : Contains the address of the buffer which is to receive the data that has been read. The programmer is himself responsible for dimensioning the buffer to a size that can accept ‘LEN’ bytes. The buffer can be a single variable, an array or a structure, whose address can be found with the ADR operator.

READ : The ADS command is triggered by a rising edge at this input.

TMOUT : States the time before the function is cancelled.

VAR_OUTPUT

VAR_OUTPUT
    BUSY        : BOOL;
    ERR         : BOOL;
    ERRID       : UDINT;
END_VAR

BUSY : This output remains TRUE until the block has executed a command, but at the longest for the duration supplied to the ‘Timeout’ input. While Busy = TRUE, no new command will be accepted at the inputs. Please note that it is not the execution of the service but its acceptance whose time is monitored.

ERR : This output is switched to TRUE if an error occurs during the execution of a command. The command-specific error code is contained in ‘ErrorId’. If the block has a timeout error, ‘Error’ is TRUE and ‘ErrorId’ is 1861 (hexadecimal 0x745). Is reset to FALSE by the execution of a command at the inputs.

ERRID : Contains the command-specific error code of the most recently executed command. Is reset to 0 by the execution of a command at the inputs.

Example of calling the block in FBD:

Here the error status of axis no. 6, as an element with a size of 4 bytes, is interrogated and written into the ‘dataArr’ buffer. The IDXGRP 00004006 (hex) and the IDXOFFS 00000001 (hex) can be found in the NC-ADS documentation.

Requirements