描述
CPU主要由运算器、控制器、寄存器及实现它们之间联系的数据、控制及状态总线构成，CPU单元还包括外围芯片、总线接口及有关电路。内存主要用于存储程序及数据，是PLC不可缺少的组成单元
Avaya Lucent AT&T Definity TN1648 V6 Sys Access-Maint
Avaya Lucent AT&T Definity TN1650B V2 Memory 32MB Card
Avaya Lucent AT&T Definity TN1650B V4 Memory 32MB Card
Avaya Lucent AT&T Definity TN1650B V6 Memory 32MB Card
Avaya Lucent AT&T Definity TN1654 V9 DS1 Converter
Avaya Lucent AT&T Definity TN1655 V7 Packet Interface
Avaya Lucent AT&T Definity TN1657 V11 Disk Drive w/IBM
Avaya Lucent AT&T Definity TN2182B V1 Tone Clock
Avaya Lucent AT&T Definity TN2224B V13 2W Digital Line
Avaya Lucent AT&T Definity TN464F V16 DS1 INTFC 24/32
