• Home
• Function/Function Block Reference
• IEC 61131-3 Functions and Function Blocks
• Data Type Conversion
• FROM_LITTLE_ENDIAN

FROM_LITTLE_ENDIAN

Type	Function
Description	Converts the value connected to IN from Little Endian format into the internal endianness of the controller. Only in this format received data can be processed further on the controller.
Notes	The function can operate on various input data types. The data types of the input and the output shall be of the same type. The data type of the output can be larger than the input data type. If an array or structure is converted, the byte order is reversed for each individual component. Input data that is contained in the array or structure but cannot be converted (for example, data type STRING) is copied as is. The function supports structures up to a nested level of 10.
Parameters	Input IN Data type: The function is available for the following input data types: ANY_INT ANY_BIT ANY_REAL ANY_DURATION Arrays (ARRAY) of the above data types Structures (STRUCT) with components of the above data types Description: Input data with Little Endian byte order. Output OUT Data type: Same as input data type Description: Output data with endianness used on the controller.
Example	Example in ST out := FROM_LITTLE_ENDIAN(INT#16#1234);   (* results in 13330 *)
Additional information	Endianness conversion functions The endiannesss conversion functions convert to and from the internally used endianness of the controller. They can be used in communication processes to convert incoming and outgoing data into the format that is specified in the communication protocol: TO_BIG_ENDIAN and TO_LITTLE_ENDIAN - preparing data for sending These functions convert the input value from the endianness used on the controller to the endianness stated in the function name. This data can then be passed on to a communication protocol. FROM_BIG_ENDIAN and FROM_LITTLE_ENDIAN - converting received data These functions convert the input value from the endianness stated in the function name to that of the controller. They are used to prepare the data received by communication partners for further processing on the controller. EN/ENO behavior The POU is only executed if TRUE is applied to the EN input. If EN = FALSE, the POU is not executed and ENO = FALSE indicates the inactivity. Further Info See the topic "General information on execution control with EN/ENO" for further details.