Remote maintenance simulator for PLC systems

Description

This function block controls a conveyor belt either automatically in cyclic mode or manually via a button. Integrated emergency stop logic ensures maximum safety. The clearly structured SCL code is immediately ready for use in the Siemens TIA Portal and offers reliable control while simultaneously simplifying operation.

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

Safety first: If the emergency stop is activated, the conveyor belt stops immediately. All internal states are reset, and an alarm is activated.

Depending on the mode, the control then runs in two variants:

1. Automatic operation:
   The belt starts automatically, conveys material and stops as soon as a sensor signals: Material detected .
   The control system then waits for the end of processing – or until there is no more material – and briefly pushes the belt again to initiate the next cycle.
2. Manual operation:
   The operator controls the belt directly using the start/stop button .
   Once started, the belt runs continuously until the stop button is pressed and the cycle is reset.

Technical details

• Emergency stop query:
  Prioritized and always effective – shuts down the system immediately.
• Triggers & Markers:
  Edge detection for start, stop and material detection.
  Depending on the mode (automatic/manual), an internal marker is set and controlled.
• Automatic FSM:
  The state machine goes through three clear steps:
• • Feed active
  • Keep processing
  • Supply impulse
• Manual operation:
  Works via latch markers that keep the tape active until a stop button is pressed.
• Outputs:
  FoerdererEin , BetriebAktiv and StatusFoerderung output clear TRUE/FALSE signals – for controlling relays or visualization on the HMI.

Possible applications

Ideal for:

• assembly lines
• Packaging systems
• Sorting systems

The module also provides practical training and demonstrations of the use of state control, safety, and sensor logic in test systems. Thanks to its modular structure, the control system can be easily adapted—e.g., for different material types, cycle times, or sensors.

compatibility

• Runs on S7-1200 and S7-1500 from Siemens
• Usable from TIA Portal V13
• Recommended for TIA V16+ and PLCSIM for comprehensive simulation and HMI integration

Scope of delivery

You get the .scl file with:

• Complete declaration of all inputs/outputs
• FSM control for both operating modes
• Trigger modules for buttons & sensors

The download link is available immediately after purchase.

Support

I am happy to help you with:

• integration into your system
• adapting the cycle logic
• Extensions with additional sensors or HMI elements

Just email me or contact me via shop support for customized support.