FB_EcLogicalReadCmd

VAR_INPUT

VAR_INPUT
    sNetId   : T_AmsNetId; 
    logAddr  : UDINT; 
    len      : UDINT;
    pDstBuf  : DWORD;
    bExecute : BOOL;
    tTimeout : TIME := DEFAULT_ADS_TIMEOUT;
END_VAR

sNetId: This is a string that contains the AMS network identifier of the EtherCAT master device.

logAddr: Logical address.

len: Count of bytes to read.

pDestBuf:The address (pointer) of the receive buffer.

bExecute: The block is activated by a rising edge at this input.

tTimeout: Maximum time allowed for the execution of the function block.

VAR_OUTPUT

VAR_OUTPUT
    bBusy   : BOOL;
    bError  : BOOL;
    nErrId  : UDINT;
    wkc     : UINT; 
END_VAR

bBusy: This output is set when the function block is activated and remains set until an acknowledgement is received.

bError: This output is set up after the bBusy output has been reset if there has been an error in transmission of the command.

nErrId: Supplies the ADS error code associated with the most recently executed command if the bError output is set.

wkc: The working counter is incremented by 1 for each EtherCAT slave that is addressed by this command. If only on EherCAT slave is addressed by this command, the working counter will be 1.

Sample for an implementation in ST: 

PROGRAM Test_LogicalReadCmd
VAR
    fbReadCmd   : FB_EcLogicalReadCmd;
    bExecute    : BOOL;
    value       : USINT;
    logAddr     : UDINT :=16#10000;
    sNetId      : T_AmsNetId:='192.168.1.5.3.1';
    
    wkc         : UINT;
    bError      : BOOL;
    nErrId      : UDINT;
END_VAR

fbReadCmd (sNetId:=sNetID, logAddr:=logAddr, LEN := SIZEOF(value), pDstBuf:=ADR(value), bExecute:=bExecute);
wkc := fbReadCmd.wkc;
bError:=fbReadCmd.bError;
nErrId:=fbReadCmd.nErrId;

Requirements