The Central Processing Unit (CPU), or main processor, is a microprocessor-based component within a PLC. It monitors the status of field inputs, runs the control program, and issues commands to the field outputs. This sequence enables the PLC to efficiently oversee and regulate various industrial...
In order to really take advantage of these security components, they have to be properly configured and activated by the firmware and the kernel at boot time. The security of the boot process is crucial, as weakness at this stage may lead to a serious security flaw, despite the reliable des...
它還包含代表目前運作的程式計數器 (Program counter)數值和處理器的暫存器內容。行程還包括存放暫用資料 (譬如:副程式的參數、返回位址,及暫時性變數)的行程堆疊 (stack),以及包含整體變數的資料區間(data section)。行程也包含堆積 (heap),堆積就是在行程執行期間動態配置的記憶體,行程記憶體結構如圖。