ReadMemory

Library: IODrvEtherCAT

This function block is for reading the memory of EtherCAT Slaves.

Inputs
Name	Data type	Description
`xExecute`	`BOOL`	Rising edge: Starts the reading. Falling edge: Resets outputs. If a falling edge occurs before the function block has completed the command, the outputs continue working normally. They are reset only if the command has either been fully executed or aborted (`xAbort`) or if an error occurs. In this case the corresponding output values (`xDone`, `xError`, `iError`) are present at the output for precisely one cycle.
`xAbort`	`BOOL`	`TRUE`: Command is immediately aborted and all outputs are set to their initial values.
`usiCom`	`USINT`	Index number of the EtherCAT master (1 for the first master…)
`wSlaveAddress`	`WORD`	Automatically increased address or physical address of the device.
`xAutoIncAdr`	`BOOL`	Flag for interpretation of the address
`xBroadcast`	`BOOL`	Flag indicating whether broadcast reading is to be used. `TRUE`: `wSlaveAddress` and `bAutoIncAdr` are not used
`uiMemOffset`	`UINT`	Offset of the memory in the EtherCAT slave memory image
`iSize`	`INT`	Number of bytes to be read.
`pDest`	`POINTER OF BYTE`	Buffer for the storage of the data
`udiTimeOut`	`IDINT`	Watchdog time for the command in ms

Outputs
Name	Data type	Description
`xDone`	`BOOL`	`TRUE`: Reading was completed without error.
`xBusy`	`BOOL`	`TRUE`: Reading is not yet completed.
`xError`	`BOOL`	`TRUE`: An error occurred during reading; the function block aborts the command.
`xAborted`	`BOOL`	`TRUE`: Command was aborted by the user.

Example: reading the register 0x130 (current status)

PROGRAM PLC_PRG
VAR
        etcreadmemory : ReadMemory;
        wStatus : WORD;
        xRead : BOOL;
END_VAR

etcreadmemory(xExecute := xRead, usiCom:=1, wSlaveAddress := 1002,
                        xAutoIncAdr := FALSE, xBroadcast := FALSE, uiMemOffset := 16#130,
                        iSize := 2, pDest := ADR(wStatus), udiTimeout := 500);