FP_ASCII_CHECK

ASCII data check

This FP instruction checks whether the ASCII codes stored in the area specified by s2_AsciiData can be converted correctly using the conversion method specified by s1_Format.

  • If the results are correct, the system variable sys_bIsEqual and the output d_IsValid turns on.

  • If the results are incorrect, the system variable sys_bIsEqual and the output d_IsValid turns off.

Parameters

Input

s1_Format (STRING)

Control and format string set in inverted commas

s2_AsciiData (BOOL, INT, UINT, WORD, DINT, UDINT, DWORD, REAL, DATE, TOD, DT, STRING)

Starting address for storing ASCII data

n_Conversions (WORD, INT, UINT)

Quantity of numbers to be converted: 0–65535

n_AsciiDataStartPosition (INT)

Starting position in ASCII data: 0–255

Output

d_IsValid (BOOL)

TRUE, if ASCII data consits of binary numbers that can be converted into the desired format

Explanation and examples of control string s1_Format for 16-bit PLCs

s1_Format: e.g. +%08lX

Position in the example

Description

s1_Format

ASCII data

Comment

+

forward (only for hexadecimal numbers)

'+%4X'

'2AB'

forward direction (only available with specifier x, X)

if plus sign is omitted: reverse (default setting)

'%4X'

'B2A'

reverse direction

%

format string specifier (mandatory)

padding format

0

fill with zeros

'%06x'

'000100'

width six characters, decimal value with three leading zeros (not allowed for specifier i, d, mandatory for specifier x, X)

8

width of the ASCII data element

'%06d'

'100'

width six characters with three leading spaces

Permissible range for the value before the specifier:

  • 1–15 before specifiers d, ld, i, li

  • 1–4 before specifier X

  • 1–8 before specifier lX

I

double length specifier

e.g. specifier i with l = Ii -> DINT

'+%4Id'

'100'

width four characters, requires DINT or DWORD for the converted result

format specifier

i

INT

'%6i'

'-100'

width six characters, three leading spaces, signed integer

d

INT

'%6d'

'000100'

width six characters, decimal value with three leading zeros

X

hexadecimal upper case

'%4X'

'12A'

width four characters, hexadecimal number in upper case

Explanation and examples of control string s1_Format for 32-bit PLCs

s1_Format: e.g. +%#12.5lxBCD

Position in the example

Description

s1_Format

ASCII data

Comment

+

forward (only for hexadecimal numbers)

'+%4X'

'2AB'

forward direction (only available with specifier x, X or b)

if plus sign is omitted: reverse (default setting)

'%4X'

'B2A'

reverse direction

%

format string specifier (mandatory)

padding format

0

fill with zeros

'%06d'

'000100'

width six characters, decimal value with three leading zeros

+

add a plus sign

'%+4d'

'+100'

width four characters, decimal value, + sign added

-

left alignment

'%-6d'

'100'

width six characters, decimal value, left aligned

(space) add a space instead of plus sign

'%4d'

'100'

width four characters, decimal value with leading spaces

#

insert 0x for hexadecimal numbers

'%#4X'

'0X64'

width four characters, numerical value in hexadecimal format starting with 0X

append always a decimal point for real number

'%#8.0f'

'123.'

width eight characters, floating-point number, four leading spaces

12

width of the ASCII data element (with or without comma)

'%012d'

'000000000100'

width 12 characters with nine leading zeros

no width:

  • FP_BIN_TO_ASCII: required minimum width is assumed

  • ASCII_TO_BIN and FP_ASCII_CHECK: comma separator is required

'%d,'

100,

no width is specified, comma is appended

precision after decimal point

.5

any digit after decimal point

'%8.3f'

'123.456'

width eight characters, three characters precision after decimal point

double length specifier

I

double the length of the specifier

e.g. specifier i with l = Ii -> DINT

'+%4Iu'

'100'

width four characters, requires DINT or DWORD for the converted result

format specifier

i

INT

'%10i'

'-100'

width 10 characters, six leading spaces, signed integer

u

UINT1)

'%10u'

'100'

width 10 characters, seven leading spaces, unsigned integer

d

INT

'%6d'

'000100'

width six characters, decimal value with three leading zeros

x

hexadecimal lower case

'%4x'

'12a'

width four characters, hexadecimal number in lower case

X

hexadecimal upper case 1)

'%4X'

'12A'

width four characters, hexadecimal number in upper case

b

BCD

'%5b'

'123'

width five characters, BCD data

f

floating

'%-6.2f'

'1.23'

width six characters, left aligned, precision two digits after decimal point

e

exponential 1.23e10

'%9.3e'

'1.235e+03'

width 9 characters, precision 3 digits after decimal point, exponential lower case

E

exponential upper case 1.23E10 1)

'%9.3E'

'1.235E+03'

width 9 characters, precision 3 digits after decimal point, exponential upper case

g

floating or exponential 1)

'%12g'

'1234.57'

width 12 characters, floating-point number

G

floating or exponential upper case1)

'%#9.3G'

'1.E+03'

width nine characters, precision three characters after decimal point

  • For FP_BIN_TO_ASCII: any string can be appended to the conversion

  • For ASCII_TO_BIN and FP_ASCII_CHECK: only comma is allowed

'%8dPANA'

'100PANA'

width eight characters, decimal number, 'PANA' is appended

1) The FP instructions FP_ASCII_TO_BIN and FP_ASCII_CHECK do not differentiate between upper and lower case

Error flags

sys_bIsOperationErrorHold (turns to TRUE and remains TRUE)

  • if there is an error in the control string specified by sFormat.

  • if forward direction (+) is specified in sFormat when the format is decimal.

  • if the number of ASCII characters per converted unit specified by n_Conversions exceeds 4 for 16-bit data or 8 for 32-bit data when hexadecimal format is specified by s1_Format.

  • if 0 is specified for the no. of 16- or 32-bit (1- or 2-word) units to be converted in n_Conversions.

  • if the number of 16- or 32-bit decimal numbers to be converted specified by n_Conversions exceeds the area for storing ASCII data.

  • if the converted result exceeds the area.

sys_bIsOperationErrorNonHold (turns to TRUE for one scan)

  • if there is an error in the control string specified by sFormat.

  • if forward direction (+) is specified in sFormat when the format is decimal.

  • if the number of ASCII characters per converted unit specified by n_Conversions exceeds 4 for 16-bit data or 8 for 32-bit data when hexadecimal format is specified by s1_Format.

  • if 0 is specified for the no. of 16- or 32-bit (1- or 2-word) units to be converted in n_Conversions.

  • if the number of 16- or 32-bit decimal numbers to be converted specified by n_Conversions exceeds the area for storing ASCII data.

  • if the converted result exceeds the area.

Related topics:

FP_ASCII_TO_BIN

FP_ASCII_CHECK

System instructions

Instructions pane

Memory areas

Data types

Parent topic: FP instructions

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		bStart: BOOL:=FALSE;
		sExample1: STRING[32]:='*1234,5678,';
		bIsAsciiValid: BOOL:=FALSE;
	END_VAR

POU body

When bStart is set to TRUE, the instruction checks whether the data connected at s2_AsciiData can be converted to decimal data when the format string is '%d'.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 8 ;
        NETWORK_BODY
B(B_VARIN,,'%d~',26,2,28,4,);
B(B_VARIN,,2,26,4,28,6,);
B(B_VARIN,,1,26,5,28,7,);
B(B_F,Adr_Of_VarOffs_I!,,14,2,23,6,,?D@'Var'?DOffs?CAdr);
B(B_VARIN,,sExample1,12,3,14,5,);
B(B_VARIN,,2,12,4,14,6,);
B(B_VAROUT,,bIsAsciiValid,41,2,43,4,);
B(B_F,FP_ASCII_CHECK!,,28,0,41,7,,?DEN?hs1_Format?ds2_AsciiData?dn_Conversions?dn_AsciiDataStartPosition?AENO?cd_IsValid);
B(B_CONTACT,,bStart,5,1,7,3,);
L(23,4,28,4);
L(1,2,5,2);
L(7,2,28,2);
L(1,0,1,8);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

If (bStart) then
    FP_ASCII_CHECK(s1_Format := '%d,',
                   s2_AsciiData := Adr_Of_VarOffs(Var := sExample1, Offs := 2),
                   n_Conversions := 2, 
                   n_AsciiDataStartPosition := 1,
                   d_IsValid => bIsAsciiValid);
End_if;

Modified on: 2021-08-13Feedback on this pagePanasonic hotline