PLC Programming Lab Instructions

Equipment and Components

• PLC: Siemens Logo
• Main switch: Currently in off position
• Input switches: 4 switches
• Output devices:
  • Lamp
  • Buzzer
  • Fan

Steps for Setting Up and Connecting Devices

1. Connecting Power Supply
   • Connect your power plug to the main supply.
2. Connecting PLC to Laptop
   • Use an Ethernet cable to connect the PLC to the laptop.
3. Turning On the PLC
   • Push the main switch up to turn on the PLC.
   • The PLC screen will display the date and time once it’s on.
4. Configuring the PLC Network
   • Open the menu selection by pressing the escape button.
   • Navigate to 'Network' using the arrow buttons and press OK.
   • Note down the IP address, subnet mask, and gateway displayed.
5. Configuring Network on PC/Laptop
   • Go to the network icon and open network settings.
   • Go to Ethernet settings and click 'Change Adapter Options'.
   • Right-click on Ethernet, select 'Properties', and find 'Internet Protocol Version 4 (TCP/IPv4)'.
   • Click on 'Properties' and choose 'Use the following IP address'.
   • Enter the IP address, subnet mask, and gateway:
     • IP Address: First three numbers should match PLC’s IP (e.g., 192.168.000.XXX).
     • Subnet Mask: Auto-filled
     • Gateway: Same as the PLC gateway
   • Click OK and then Close.

Using Logo Soft Comfort Software

1. Launching the Software
   • Double-click the Logo Soft Comfort icon on your desktop.
2. Creating Ladder Diagram
   • Go to File -> New -> Ladder Diagram.
   • Follow ladder diagram instructions to construct your circuit.
   • Example components:
     • Start Button: Make contact (I1 input)
     • Normally Closed Contact: Great contact (I2 input)
     • Internal Relay: Relay coil (M1 flag)
     • Normally Open Contact: Make contact (M1 relay coil)
     • Timer: On-delay timer (set to 5 seconds)
     • Output: Relay coil (Q1 - real output)
   • Connect all components accordingly.
3. Saving and Transferring the Program
   • Save the diagram.
   • Go to Tools -> Transfer -> PC to Logo.
   • Refresh to see accessible logos and connect to the device.
   • Follow prompts to change device mode (Stop/Run) as needed.

Testing and Simulation

1. Testing the PLC Circuit
   • Turn On Lamp: Press and release I1, lamp turns on after 5 seconds.
   • Turn Off Lamp: Press and release I2.
2. Using Simulation
   • Click the simulation icon (SIM) on the taskbar.
   • Test functionality using I1, I2, and observe M1 and Q1 indicators.
   • Verify timed operations and relay status changes.