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Button (impulse switch)

€1,95 EUR
€1,95 EUR
Sale Sold out
Description

The FB_EdgePulseGenerator function block detects rising and falling edges of an input signal (e.g., a button) and generates a defined 1-second pulse via a monostable timer (TP) when the button is pressed. Main and auxiliary contacts (NO/NC) are switched depending on the pulse state. There are clear modes for simulation, deactivation, and reset.

Note: This logic is intended as a template. It must be integrated, reviewed, and approved by qualified personnel before productive use. Improper use may lead to unexpected behavior.

How it works
Disabled

If #Enable is not set, outputs are disabled. The timer is stopped, but the current input state is still stored for correct detection upon reactivation.

Edge detection

The block detects rising ( #risingEdge ) and falling ( #fallingEdge ) edges of the input signal #Coil_A1 by comparing it with the previous state.

Pulse generation

On a rising edge, a 1-second pulse is generated via the monostable timer #TP_Impulse . During this pulse, certain contacts are considered active or inactive.

Contact logic

Main and auxiliary contacts are set depending on the pulse state:

  • #Klemme14 := #Klemme13 AND #TP_Impulse.Q – NO main contact active during pulse
  • #Klemme22 := #Klemme21 AND NOT #TP_Impulse.Q – NC main contact outside pulse
  • #Klemme34 := #Klemme33 AND #TP_Impulse.Q – NO auxiliary contact during pulse
  • #Klemme42 := #Klemme41 AND NOT #TP_Impulse.Q – NC auxiliary contact outside pulse

At the end, the current input state is saved so that the next edge is correctly detected.

Technical details
  • Input signal: #Coil_A1 (e.g. button)
  • Edge detection: #prev , #risingEdge , #fallingEdge
  • Timer: #TP_Impulse (monostable pulse: 1 second)
  • Contacts: Main and auxiliary contacts NO/NC: #Klemme13/14 , #Klemme21/22 , #Klemme33/34 , #Klemme41/42
  • Control: #Enable , #Reset , #SimMode
  • Internal state: #tog is not used here (blink-free, pulse-oriented)
Possible applications
  • Generation of defined pulses when a key is pressed or a signal changes
  • Pre-testing of signal sequences in simulation mode
  • Linking of main and auxiliary contacts for clear switching states
  • Support in diagnosis through recognizable impulse events

Note: A complete technical inspection and approval by qualified personnel is required before productive use.

compatibility
  • Siemens S7-1200 & S7-1500 controllers
  • Suitable for TIA Portal with SCL support
  • Integration into higher-level control processes possible
  • Simulation option without real outputs for validation
Scope of delivery

You will receive:

  • An SCL file with implemented function block
  • Clear declaration of all inputs/outputs and timer instance
  • Annotated structure for quick adaptation
  • Quick guide to integration

The download link will be provided after purchase.

Support

I am happy to support you with:

  • Adjusting the edge/pulse logic
  • Integration into process or diagnostic chains
  • Understanding impulse behavior and state interpretation
  • Specific adjustments for your application

Contact is possible via shop message or email. Extensions are available as optional customizations.