| 品牌：ABB | 規格：AI523 AI523B4 | 材質：AI523 AI523B4 |
| 產地：瑞士 |
AI523 AI523B4
AI523 AI523B4
AI523 AI523B4
存儲器
與微型計算機一樣，除了硬件以外，還有軟件。才能構成一臺完整的PLC。PLC的軟件分為兩部分: 係統軟件和應用軟件。存放係統軟件的存儲器稱為係統程序存儲器。
PLC存儲空間的分配：雖然大、中、小型 PLC的CPU的大可尋址存儲空間各不相同，但是根據PLC的工作原理，其存儲空間一般包括以下三個區域：係統程序存儲區，係統RAM存儲區（包括I/O映象區和係統軟設備等）和用戶程序存儲區
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