stack区域用于子程序返回地址，也用于存储自动数据。
The stack region is used for subroutine return addresses, as well as to store automatic data.
发现数据库的数据有错误后，系统自动对系统数据进行校验，并运行纠错子程序纠正数据错误。
When discovering data errors in the database, the system will check the system data automatically, and run rectifying subprogram to correct them.
介绍了系统PLC主控制器I/O端口设计，系统硬件组成和系统软件中主程序及自动加工子程序设计；
The I/O design of PLC controller, the hardware configuration and the main routine and auto-machining subroutine of software program are presented.
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