Siemens S7-200PLC interrupt instruction how to use - Database & Sql Blog Articles

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For example, let's say there is an external button connected to the I0.0 terminal. When you press the I0.0 terminal, you want a specific action to happen immediately. First, you check the interrupt event number. The event corresponding to event 0 is the I0.0 pressed event. You use the ATCH instruction, set EVEN to 0, and specify INT_0 as the INIT parameter.

The meaning of this is that when I0.0 is closed, it immediately triggers the INT_0 interrupt routine to execute the program, and then enables the global interrupt. The ENI instruction is used to enable the total interrupt.

So, using interrupts in S7-200 PLC generally involves three steps:

1. Connect the interrupt using the ATCH command
2. Enable the global interrupt with the ENI instruction
3. Write the code inside the interrupt routine that needs to be executed

This method allows for quick responses to input signals, making your PLC programs more efficient and responsive. It’s especially useful in applications where real-time processing is required, such as controlling machines, monitoring sensors, or responding to user inputs instantly. Always make sure to test your interrupt routines thoroughly to avoid unexpected behavior or system crashes.