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SCM的Handler
SCM的Handler分為可組態(tài)的Handler和不可組態(tài)的Handler，可組態(tài)的Handler如圖1所示。
3.1  可組態(tài)的Handler有：
（1）    Check Handler：SCM激活或執(zhí)行一個(gè)RESET命令或在Main、Stop和Abort Handler處理完成后執(zhí)行。
（2）    Main Handler：是SCM的主程序，SCM能包含多個(gè)Main Handler，當(dāng)Main Handler激活且Transition條件滿足（True）時(shí)自動(dòng)執(zhí)行，當(dāng)Main Handler激活且發(fā)布START命令時(shí)手動(dòng)執(zhí)行。
（3）    Interrupt Handler：就象MainHandler的一個(gè)子程序，當(dāng)active Step的interrupt 條件滿足或發(fā)布interrupt命令或InterruptHandler 激活且 Invoke Transition 條件滿足時(shí)執(zhí)行。
（4）    Hold Handler：是一個(gè)異常的Handler，當(dāng)發(fā)布HOLD命令或Hold Handler 激活且 Invoke Transition 條件滿足時(shí)執(zhí)行。
（5）Restart Handler：只能從Held狀態(tài)開始執(zhí)行，完成后直接進(jìn)入Main Handler主程序。
（6）    Stop Handler：是一個(gè)異常的Handler，當(dāng)發(fā)布STOP命令或Stop Handler 激活且 Invoke Transition 條件滿足時(shí)執(zhí)行。
（7）    Abort Handler：是一個(gè)異常的Handler，當(dāng)發(fā)布ABORT命令或Abort Handler 激活且 Invoke Transition 條件滿足時(shí)執(zhí)行。
通常我們組態(tài)的順控程序放在Main Handler中，當(dāng)SCM下裝以后自動(dòng)執(zhí)行，其它的Handler可以不用組態(tài)。
SCM handler
SCM handlers are divided into configurable handlers and non configurable handlers. Configurable handlers are shown in Figure 1.
3.1 configurable handlers include:
(1) Check handler: SCM activates or executes a reset command or executes it after the main, stop, and abort handler processes are completed.
(2) Main handler: it is the main program of SCM. SCM can contain multiple main handlers. When the main handler is activated and the transition condition is met (true), it will be executed automatically. When the main handler is activated and the start command is issued, it will be executed manually.
(3) Interrupt handler: like a subroutine of mainhandler, it is executed when the interrupt condition of active step is met or the interrupt command is issued or the interrupt handler is activated and the invoke transition condition is met.
(4) Hold handler: an exception handler, which is executed when the hold command is issued or the hold handler is activated and the invoke transition condition is met.
(5) Restart handler: it can only be executed from the held state, and then directly enter the main handler main program.
(6) Stop handler: an exception handler, which is executed when the stop command is issued or the stop handler is activated and the invoke transition condition is met.
(7) Abort handler: an exception handler, which is executed when abort command is issued or abort handler is activated and invoke transition condition is met.
Usually, the sequence control program we configure is placed in the main handler. When SCM is installed, it will be executed automatically. Other handlers can not be configured.