printf

Function - Display a trace output.

Inputs

Input	Data type	Description
FMT	STRING	Trace message.
ARG1..ARG4	DINT	Numerical arguments to be included in the trace.

Outputs

Output	Data type	Description
Q	BOOL	Return check.

Remarks

This function works as the famous "printf" function of the "C" language, with up to 4 integer arguments. You can use the following pragmas in the FMT trace message to represent the arguments according to their left to the right order:

%ld    signed value in decimal
%lu    unsigned value in decimal
%lx    value in hexadecimal

The trace message is displayed in the LOG window with Runtime Service messages. Trace is supported by the simulator.

Attention

Your target platform may not support trace functions. Please refer to OEM instructions for further details on available features.

Example

(* i1, i2, i3, i4 are declared as DINT *)
i1 := 1;
i2 := 2;
i3 := 3;
i4 := 4;
printf ('i1=%ld; i2=%ld; i3=%ld; i4=%ld', i1, i2, i3, i4);

Output message:

i1=1; i2=2; i3=3; i4=4;

printf

IEC 61131-3 Automation platform > Programming - Reference guide > Advanced operations > printf

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