FB_CX70xx_RW_EEPROM

The function block allows a maximum of 120 bytes to be written to the EEPROM (hardware) of the CX70xx. The EEPROM may be written to a maximum of 200 times. The memory is intended for one-time writing.

This function block can be used to personalize the CX70xx. That means, in the simplest case you write your company ID into the EEPROM. When starting the CX70xx program, read the contents of the memory. For example, if it is empty, you cannot continue to run the program because it is no longer your original CX70xx that you programmed.

If you want to exchange a CX70xx for a new device, the EEPROM must be written again by you.

Inputs

VAR_INPUT
    bExecute       : BOOL;         // rising edge triggers process with selected mode
    eMode          : E_CX70xx_EEPROM_Mode;    // select RW mode
    pSrcBuf        : PVOID;        // pointer to WRITE EEPROM data buffer
    cbSrcBufSize   : UINT;         // size of WRITE EEPROM data buffer (max.120 Bytes)
    pDstBuf        : PVOID;        // pointer to READ EEPROM data buffer
    cbDstBufSize   : UINT;         // max.size of READ EEPROM data buffer (max.120 Bytes)
END_VAR

Outputs

VAR_OUTPUT
    bBusy            : BOOL;         // FB is working
    bError           : BOOL;         // FB has an Error
    nErrorID         : UDINT;        (* Error Code
    If nErrorID=DEVICE_INVALIDACCESS the EEPROM write cycles reached max. value. 
    If nErrorID=DEVICE_INVALIDPARM the given pointer parameter is invalid/null. 
    If nErrorID=DEVICE_INVALIDSIZE the given buffer size is too small or too big.
    If nErrorID=DEVICE_SRVNOTSUPP probably the image version need to be updated to support this feature. *)
    nDataSizeEEPROM  : UINT;         // current size of (read) EEPROM data in bytes (max.120 Bytes)
    nWritesCycles    : UINT;         // already performed EEPROM write cycles (maximum possible = 200)
END_VAR