F73_BCD2A

Converts the BCD code starting from the 16-bit area specified by s1 to the ASCII code that expresses the equivalent decimals according to the contents specified by s2 if the trigger EN is in the ON-state. s2 specifies the number of source data bytes and the direction of converted data (normal/reverse).

Parameters

Input

s1_Start (WORD)

starting 16-bit area for BCD data (source)

s2_Number (WORD, INT, UINT)

specifies number of source data bytes to be converted, and how it is arranged

Output

d_Start (WORD)

starting 16-bit area for storing converted result (destination)

Remarks

• Instead of using this F instruction, we recommend using the corresponding FP7 instruction: FP_BCD_TO_ASCII

• Specifying s2_Number (direction and number)

  

  1.  (1) Number of bytes for BCD data
     • 1: 1 byte (BCD code that expresses a 2-digit decimal)
     • 2: 2 bytes (BCD code that expresses a 4-digit decimal)
     • 3: 3 bytes (BCD code that expresses a 6-digit decimal)
     • 4: 4 bytes (BCD code that expresses a 8-digit decimal)
  2.  (2) Direction of converted data
     • 0: Normal direction
     • 1: Reverse direction

• The two characters that make up one byte are interchanged when stored. Two bytes are converted as one segment of data:

  

  1.  (1) Normal direction
  2.  (2) Reverse direction
  3.  (3) Converted result

  The converted result is stored in the area specified by d. ASCII code requires 8 bits (one byte) to express one BCD character. Upon conversion to ASCII, the data length will thus be twice the length of the BCD source data.

• ASCII HEX code to express BCD character:

  BCD character	ASCII HEX code
  0 1 2 3 4 5 6 7 8 9	H30 H31 H32 H33 H34 H35 H36 H37 H38 H39

Error flags

sys_bIsOperationErrorHold (turns to TRUE and remains TRUE)

• if the data specified by s1 is not BCD data.

• if the number of bytes specified by s2 exceeds the area specified by s1.

• if the converted result exceeds the area specified by d.

• if the data specified by s2 is recognized as "0".

• if the number of bytes specified by s2 is more than 16#4.

sys_bIsOperationErrorNonHold (turns to TRUE for one scan)

• if the data specified by s1 is not BCD data.

• if the number of bytes specified by s2 exceeds the area specified by s1.

• if the converted result exceeds the area specified by d.

• if the data specified by s2 is recognized as "0".

• if the number of bytes specified by s2 is more than 16#4.