F74_A2BCD

Converts the ASCII codes that express the decimal characters starting from the 16-bit area specified by s1 to BCD if the trigger EN is in the ON-state. s2 specifies the number of source data bytes and the direction of converted code source data.

Parameters

Input

s1_Start (WORD)

starting 16-bit area for storing ASCII code (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_ASCII_TO_BCD

• Specifying s2_Number (direction and number)

  

  1.  (1) Number of bytes for ASCII characters
     • 1:: 1 byte (1 ASCII character)
     • 2:: 2 bytes (2 ASCII characters)
     • 3:: 3 bytes (3 ASCII characters)
     • 4:: 4 bytes (4 ASCII characters)
     • 5:: 5 bytes (5 ASCII characters)
     • 6:: 6 bytes (6 ASCII characters)
     • 7:: 7 bytes (7 ASCII characters)
     • 8:: 8 bytes (8 ASCII characters)
  2.  (2) Direction of converted data
     • 0:: Normal direction
     • 1:: Reverse direction

• Four characters are converted as one segment of data:

  

  1.  (1) Normal direction
  2.  (2) Reverse direction
  3.  (3) ASCII code
  4.  (4) BCD data

  The converted result is stored in byte units in the area starting from the 16-bit area specified by d. ASCII code requires 8 bits (1 byte) to express 1 BCD character. Upon conversion to a BCD number, the data length will thus be half the length of the ASCII code source data.

• If an odd number of characters is being converted, "0" will be entered for bit position 0 to 3 of the final data (byte) of the converted results if data is sequenced in the normal direction, and "0" will be entered for bit position 4 to 7 if data is being sequenced in the reverse direction:

  

  1.  (1) ASCII code
  2.  (2) ASCII HEX code2
  3.  (3) character
  4.  (4) 7 ASCII characters (7 bytes)
  5.  (5) instruction execution
  6.  (6) This position is filled with “0”
  7.  (7) Converted result
  8.  (8) BCD HEX code

• 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 ASCII code not corresponding to decimal numbers (0 to 9) is specified.

• if the number of bytes specified by s2_Number exceeds the area specified by s1_Start.

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

• if the data specified by s2_Number is recognized as "0".

• if the number of bytes for ASCII characters in s2_Number is more than 16#8.

sys_bIsOperationErrorNonHold (turns to TRUE for one scan)

• if ASCII code not corresponding to decimal numbers (0 to 9) is specified.

• if the number of bytes specified by s2_Number exceeds the area specified by s1_Start.

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

• if the data specified by s2_Number is recognized as "0".

• if the number of bytes for ASCII characters in s2_Number is more than 16#8.