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SA0148: Unusual bit access – strict

Detects bit access which is not made to bit field data types (BYTE, WORD, DWORD, and LWORD). The IEC 61131-3 standard permits only bit access to bit field data types. However, the CODESYS compiler also permits bit access to unsigned data types.

Importance: Low

Example 109. Example
PROGRAM PLC_PRG
VAR
    iTemp1 : INT;
    diTemp3 : DINT;
    uliTemp4 : ULINT;
    siTemp5 : SINT;
    usiTemp6 : USINT;
    byTemp2 : BYTE;
END_VAR

iTemp1.3 := TRUE;    // SA0148
diTemp3.4 := TRUE;    // SA0148
uliTemp4.18 := FALSE;    // SA0148
siTemp5.2 := FALSE;    // SA0148
usiTemp6.3 := TRUE;    // SA0148
byTemp2.5 := FALSE;    // no error because BYTE is a bitfield

Output in the Messages view:

  • sa_icon_message.png SA0148: Unusual bit access – strict



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