Learn SIEMENS-S7-SIMULATION with Real Code Examples

Updated Nov 27, 2025

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Code Sample Descriptions

S7 Sim – Simple Start/Stop Motor Logic

NETWORK 1
TITLE = Start/Stop Motor
      A     I0.0
      S     M0.0
      A     I0.1
      R     M0.0
      =     Q0.0

Basic motor latch logic using simulated I/O inside TIA Portal.

Let’s Try →

S7 Sim – Timer ON Delay (TON)

NETWORK 1
TITLE = TON Example
      A     I0.0
      TON   T1, PT := T#5s
      =     Q0.0

Simulates a TON block to delay output activation.

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S7 Sim – Blinking Light Using Free Running Clock

NETWORK 1
TITLE = Blink
      A     M0.5   // 1Hz clock bit
      =     Q0.1

Uses S7 system clock memory bytes to create a blink effect.

Let’s Try →

S7 Sim – Conveyor Belt Interlock Logic

NETWORK 1
TITLE = Conveyor Interlock
      A     I0.0     // Start
      A     NOT I0.1 // Emergency Stop
      A     I0.2     // Object sensor
      =     Q0.0

Simulated conveyor motor protected by emergency stop and sensor.

Let’s Try →

S7 Sim – Counter Up (CTU)

NETWORK 1
TITLE = CTU Example
      A     I0.3
      CTU   C1, PV := 10
      =     Q0.2

Simulates a CTU to count pieces on a virtual production line.

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S7 Sim – Tank Level Control (Analog Simulation)

NETWORK 1
TITLE = Tank Control
      L     PIW256
      L     500
      >I
      =     Q0.3

Controls pump based on analog tank level in PLC simulator.

Let’s Try →

S7 Sim – Alarm Trigger Logic

NETWORK 1
TITLE = Alarm
      L     PIW258
      L     300
      >I
      =     M10.0

Creates an alarm bit when a condition exceeds threshold.

Let’s Try →

S7 Sim – PID Basic Structure

NETWORK 1
TITLE = PID Control
      CALL FB41, DB41
      PV := PIW260,
      SP := PIW262,
      LMN := QW300

Simulated PID block controlling motor speed or temperature.

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S7 Sim – Traffic Light Controller

NETWORK 1
TITLE = Traffic
      A     M0.0
      TON   T1, PT := T#5s
      TON   T2, PT := T#2s

NETWORK 2
      =     Q0.0    // Red
NETWORK 3
      =     Q0.1    // Yellow
NETWORK 4
      =     Q0.2    // Green

Simulates 3-light traffic cycle using timers.

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S7 Sim – Automatic Gate Control

NETWORK 1
TITLE = Gate Logic
      A     I0.0     // Open Button
      A     NOT I0.2 // Fully open LS
      =     Q0.4     // Open Motor

NETWORK 2
      A     I0.1     // Close Button
      A     NOT I0.3 // Fully closed LS
      =     Q0.5     // Close Motor

Simulates an opening/closing gate using limit switches and motor outputs.

Let’s Try →

Code Sample Descriptions

S7 Sim – Simple Start/Stop Motor Logic

NETWORK 1
TITLE = Start/Stop Motor
      A     I0.0
      S     M0.0
      A     I0.1
      R     M0.0
      =     Q0.0

Basic motor latch logic using simulated I/O inside TIA Portal.

Let’s Try →

S7 Sim – Timer ON Delay (TON)

NETWORK 1
TITLE = TON Example
      A     I0.0
      TON   T1, PT := T#5s
      =     Q0.0

Simulates a TON block to delay output activation.

Let’s Try →

S7 Sim – Blinking Light Using Free Running Clock

NETWORK 1
TITLE = Blink
      A     M0.5   // 1Hz clock bit
      =     Q0.1

Uses S7 system clock memory bytes to create a blink effect.

Let’s Try →

S7 Sim – Conveyor Belt Interlock Logic

NETWORK 1
TITLE = Conveyor Interlock
      A     I0.0     // Start
      A     NOT I0.1 // Emergency Stop
      A     I0.2     // Object sensor
      =     Q0.0

Simulated conveyor motor protected by emergency stop and sensor.

Let’s Try →

S7 Sim – Counter Up (CTU)

NETWORK 1
TITLE = CTU Example
      A     I0.3
      CTU   C1, PV := 10
      =     Q0.2

Simulates a CTU to count pieces on a virtual production line.

Let’s Try →

S7 Sim – Tank Level Control (Analog Simulation)

NETWORK 1
TITLE = Tank Control
      L     PIW256
      L     500
      >I
      =     Q0.3

Controls pump based on analog tank level in PLC simulator.

Let’s Try →

S7 Sim – Alarm Trigger Logic

NETWORK 1
TITLE = Alarm
      L     PIW258
      L     300
      >I
      =     M10.0

Creates an alarm bit when a condition exceeds threshold.

Let’s Try →

S7 Sim – PID Basic Structure

NETWORK 1
TITLE = PID Control
      CALL FB41, DB41
      PV := PIW260,
      SP := PIW262,
      LMN := QW300

Simulated PID block controlling motor speed or temperature.

Let’s Try →

S7 Sim – Traffic Light Controller

NETWORK 1
TITLE = Traffic
      A     M0.0
      TON   T1, PT := T#5s
      TON   T2, PT := T#2s

NETWORK 2
      =     Q0.0    // Red
NETWORK 3
      =     Q0.1    // Yellow
NETWORK 4
      =     Q0.2    // Green

Simulates 3-light traffic cycle using timers.

Let’s Try →

S7 Sim – Automatic Gate Control

NETWORK 1
TITLE = Gate Logic
      A     I0.0     // Open Button
      A     NOT I0.2 // Fully open LS
      =     Q0.4     // Open Motor

NETWORK 2
      A     I0.1     // Close Button
      A     NOT I0.3 // Fully closed LS
      =     Q0.5     // Close Motor

Simulates an opening/closing gate using limit switches and motor outputs.

Let’s Try →