Q: What program should I write in INT_0? Also, I need to write a program that runs periodically.
A: To use the timer interrupt properly, you need to configure the time interval before the interrupt is triggered. This is done by setting the special register SMB34. By adjusting this register, you can define how long the interrupt will occur and the time range it covers. The available range is from 1ms to 225ms. During the execution of an interrupt program, another interrupt can also be processed if needed.
In the S7-200 PLC, the Interrupt Connection Instruction (ATCH) is used to link an interrupt event with its corresponding handler. The EVNT operand in this instruction specifies the number of the interrupt event, while the INT operand refers to the associated interrupt routine. This setup ensures that when the specified interrupt event occurs, the PLC automatically executes the linked handler.
The Interrupt Enable Instruction (ENI) is used to activate all interrupts, allowing the PLC to respond to them as they occur. Alongside ENI, there are other interrupt control instructions such as the Interrupt Disable Instruction (DISI), which stops all interrupts, and the Interrupt Disconnect Instruction (DTCH), which breaks the link between an event and its handler. These tools help manage the flow of operations and ensure smooth execution of both main programs and interrupt routines.
When writing your interrupt program, make sure it's short and efficient, as it should not interfere with the main program’s performance. Additionally, if you're using periodic tasks, consider using the system timer or a custom loop to trigger the required actions at set intervals. Always test your code thoroughly to avoid unexpected behavior or system instability.
Connector 2.00Mm Pitch,Ph Connector Accessories,Ph Connectors Accessories,Strip Wire Connectors
YUEQING WEIMAI ELECTRONICS CO.,LTD , https://www.wmconnector.com