Interrupt control function of Siemens S7-200PLC - Database & Sql Blog Articles

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The program of plc is divided into main program, subroutine and interrupt program. This paper introduces the programming method of Siemens S7-200 series PLC interrupt program in detail. Explain in detail how to implement different types of interrupt programs. Skilled use of interrupt routines is a necessary skill in PLC programming. I believe this article will be helpful to the majority of PLC programmers. Interrupts on the S7-200 include timer interrupts, IO interrupts, and communication interrupts. The IO interrupt can trigger the interrupt subroutine through an external IO point. It can be set to several modes, such as rising edge trigger, falling edge trigger, and so on. A timed interrupt is an interrupt program that is triggered by a fixed time interval. The communication interrupt can trigger an interrupt program when data reception or transmission is completed or when message reception is completed.

Timed interrupt function

Timed interrupts are an important tool for measuring cycles. The timing interrupt is also used when measuring the speed using the encoder, that is, the speed is calculated by the proportional relationship between the period and the number of pulses. The interrupt number of the timer interrupt is 10 (timer interrupt 0), 11 (timer interrupt 1), 21 (timer T32 interrupt), and 22 (timer T96 interrupt).

Communication interruption implementation

The free port communication of the S7-200 needs to set the corresponding interrupt to judge whether the communication is normal. The communication is divided into three types, that is, the character transmission and acceptance are completed, and the message acceptance is completed. The break number is port 1, 8, 9, 23, and port 2 is 25, 26, 24.