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.. <% set key = ".fld-Modbus.fld-POUs.CRC" %>
.. _`.fld-Modbus.fld-POUs.CRC`:
.. <% merge "object.Defines" %>
.. <% endmerge  %>


.. index::
   single: CRC

.. _`CRC`:

CRC (FUN)
---------

FUNCTION CRC : UINT



.. <% merge "object.Doc" %>

Name             : CRC (CRC16)
 + Date          : 20015-03-24
 + Description   : Calculate the Checksum from a Byte Array

.. <% endmerge  %>

.. <% merge "object.iotbl" %>



InOut:
    +--------+-------+-----------------------------------+---------------------------------------+
    | Scope  | Name  | Type                              | Comment                               |
    +========+=======+===================================+=======================================+
    | Return | CRC   | UINT                              |                                       |
    +--------+-------+-----------------------------------+---------------------------------------+
    | Input  | buf   | POINTER TO ARRAY [0..255] OF BYTE | Input buffer                          |
    +        +-------+-----------------------------------+---------------------------------------+
    |        | start | UINT                              | Byteposition to start CRC-calculating |
    +        +-------+-----------------------------------+---------------------------------------+
    |        | cnt   | UINT                              | Bytes to calculate                    |
    +--------+-------+-----------------------------------+---------------------------------------+

.. <% endmerge  %>

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