PLC control for model railway

Description
You are looking for an SCL function block (FB_Zugsteuerung) that automatically controls two trains and a switch in defined steps – perfect for model or demo railways in the TIA Portal.

Note: All modules are designed exclusively as a learning and optimization basis and are not approved for live operation. System modules, in particular, must be finally tested and commissioned by qualified personnel before productive use.

How it works

1. Stop signal active → both train motors off, switch in home position, step=0
2. Step 0: wait for start → Signal track 1 green, switch straight for train 1
3. Step 1: Train 1 travels to LS_Track1 → Stop, start 5-second timer
4. Step 2: Timer expired → Signal Track 1 red
5. Step 3: Switch on branch until EndSwitch1 is reached
6. Step 4: Train 2 moves → Signal Track2 green, to LS_Track2, then stop
7. After step 4: Signal track 2 red, reset to step 0

Technical details
• Inputs: Stop, Start, LS_Track1, LS_Track2, EndSwitch1
• Outputs: Motor_Train1, Motor_Train2, Switch1, SignalTrack1, SignalTrack2
• TON timer (PT=T#5s) for hold time in step 1
• Sequence control via INT variable step in CASE structure
• RETURN at Stop immediately interrupts all subsequent steps

Possible applications
• Model railway control in training and further education
• Demo stands at trade fairs or in sales
• PLC training projects and laboratories
• Retrofit and upgrade of existing systems

compatibility
• Siemens S7-1200 & S7-1500
• TIA Portal V13 or higher; recommended V16+ for PLCSIM & HMI visualization

Scope of delivery
• .scl file with declaration of all inputs/outputs, timer instance, state transitions and comments
• Download link immediately after purchase

Support
Adjustment of stop times, additional switch or signal positions, expansion to include additional trains or HMI layouts on request via shop message or email.