Learn SCHNEIDER-ECOSTRUXURE-UNITYPRO with Real Code Examples

Updated Nov 27, 2025

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Code Sample Descriptions

Hello World Output in Unity Pro (ST)

IF %I0.0 THEN
    %Q0.0 := TRUE;
ELSE
    %Q0.0 := FALSE;
END_IF;

A basic Structured Text example that turns ON %Q0.0 when %I0.0 is TRUE.

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TON On-Delay Timer (ST)

TON_1(IN := %I0.1, PT := T#5s);
IF TON_1.Q THEN
    %Q0.1 := TRUE;
END_IF;

Standard TON timer usage in Unity Pro ST.

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CTU Up Counter (ST)

CTU_1(CU := %I0.2, PV := 10);
IF CTU_1.CV >= 10 THEN
    %Q0.2 := TRUE;
END_IF;

Counting rising pulses on %I0.2. After reaching 10, %Q0.2 turns ON.

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Move Value (ST MOV Equivalent)

%MW10 := %MW0;

Moves the value of %MW0 to %MW10.

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Analog Scaling (0–27648 -> 0–100%)

Scaled := (REAL(%IW0) * 100.0) / 27648.0;

Unity analog inputs use 0–27648 for 0–20 mA or 0–10V.

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Motor Start/Stop Seal (ST)

IF %I0.3 THEN
    M_Start := TRUE;
END_IF;
IF %I0.4 THEN
    M_Start := FALSE;
END_IF;
%Q0.3 := M_Start;

Classic latch logic using %I0.3 start and %I0.4 stop.

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Rising Edge Detection (R_TRIG)

R_TRIG_1(CLK := %I0.5);
IF R_TRIG_1.Q THEN
    %Q0.4 := TRUE;
END_IF;

Using Unity’s built-in R_TRIG function block.

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FOR Loop Summing Registers

Sum := 0;
FOR i := 0 TO 9 DO
    Sum := Sum + %MW[i];
END_FOR;

Sum %MW0 through %MW9.

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PID Function Block Example

PIDAT_1(
    PV := %MW100,
    SP := %MW200,
    KP := 1.0,
    TI := 2.0,
    TD := 0.0,
    MAN := FALSE,
    OUT => %MW300
);

Calling the PIDAT block in Unity Pro for process control.

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PWM Output Example (ST)

IF Ramp >= 100 THEN
    Ramp := 0;
END_IF;
IF Ramp < Duty THEN
    %Q0.5 := TRUE;
ELSE
    %Q0.5 := FALSE;
END_IF;
Ramp := Ramp + 1;

Generating PWM by comparing a ramp counter against duty cycle.

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Code Sample Descriptions

Hello World Output in Unity Pro (ST)

IF %I0.0 THEN
    %Q0.0 := TRUE;
ELSE
    %Q0.0 := FALSE;
END_IF;

A basic Structured Text example that turns ON %Q0.0 when %I0.0 is TRUE.

Let’s Try →

TON On-Delay Timer (ST)

TON_1(IN := %I0.1, PT := T#5s);
IF TON_1.Q THEN
    %Q0.1 := TRUE;
END_IF;

Standard TON timer usage in Unity Pro ST.

Let’s Try →

CTU Up Counter (ST)

CTU_1(CU := %I0.2, PV := 10);
IF CTU_1.CV >= 10 THEN
    %Q0.2 := TRUE;
END_IF;

Counting rising pulses on %I0.2. After reaching 10, %Q0.2 turns ON.

Let’s Try →

Move Value (ST MOV Equivalent)

%MW10 := %MW0;

Moves the value of %MW0 to %MW10.

Let’s Try →

Analog Scaling (0–27648 -> 0–100%)

Scaled := (REAL(%IW0) * 100.0) / 27648.0;

Unity analog inputs use 0–27648 for 0–20 mA or 0–10V.

Let’s Try →

Motor Start/Stop Seal (ST)

IF %I0.3 THEN
    M_Start := TRUE;
END_IF;
IF %I0.4 THEN
    M_Start := FALSE;
END_IF;
%Q0.3 := M_Start;

Classic latch logic using %I0.3 start and %I0.4 stop.

Let’s Try →

Rising Edge Detection (R_TRIG)

R_TRIG_1(CLK := %I0.5);
IF R_TRIG_1.Q THEN
    %Q0.4 := TRUE;
END_IF;

Using Unity’s built-in R_TRIG function block.

Let’s Try →

FOR Loop Summing Registers

Sum := 0;
FOR i := 0 TO 9 DO
    Sum := Sum + %MW[i];
END_FOR;

Sum %MW0 through %MW9.

Let’s Try →

PID Function Block Example

PIDAT_1(
    PV := %MW100,
    SP := %MW200,
    KP := 1.0,
    TI := 2.0,
    TD := 0.0,
    MAN := FALSE,
    OUT => %MW300
);

Calling the PIDAT block in Unity Pro for process control.

Let’s Try →

PWM Output Example (ST)

IF Ramp >= 100 THEN
    Ramp := 0;
END_IF;
IF Ramp < Duty THEN
    %Q0.5 := TRUE;
ELSE
    %Q0.5 := FALSE;
END_IF;
Ramp := Ramp + 1;

Generating PWM by comparing a ramp counter against duty cycle.

Let’s Try →