What program should be written in the timer interrupt program - Database & Sql Blog Articles

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Q: What code should I write in INT_0? Also, I need to create a program that runs periodically.

A: Before the timer interrupt is triggered, you need to configure the time setting. This is done through the special register SMB34. By adjusting this register, you can define how often the interrupt occurs and set the time range between 1ms and 225ms. During the execution of an interrupt routine, other interrupts can also be processed if needed.

The S7-200 uses the Interrupt Connection Instruction (ATCH) to link an interrupt handler with a specific event. In this instruction, the EVNT operand refers to the interrupt event number, while the INT operand indicates the corresponding interrupt handler. This connection ensures that when the specified event occurs, the PLC automatically executes the associated handler.

To enable all interrupts, you use the Interrupt Enable Instruction (ENI). The PLC can then respond to interrupt events as they occur. There are several interrupt control instructions, including ENI (enable), DISI (disable), and DTCH (disconnect). These allow you to manage how the PLC handles different types of interrupts, ensuring smooth and efficient operation.

It's important to note that periodic programs, such as those running at regular intervals, should be carefully structured to avoid conflicts with interrupt routines. Proper configuration and testing are essential to ensure reliable performance in your application.