描述
PLC系统的工作任务相对简单，因此需要传输的数据量一般不会太大，所以常见的PLC系统为一层网络结构。过程级网络和操作级网络要么合并在一起，要不过程级网络简化成模件之间的内部连接。PLC不会或很少使用以太网。
Motherboard Athlon Skt AM2 ASUS M2N-E w/ 64 X2 3800 CPU
Matrox MGA-MYST/RRSTC MY220P/BYZ4C Rainbow Runner
Motherboard Pentium Dual 370 ABIT BP6 V1.0 440BX 443BX
8-bit Video Card Orchid Designer D-VGA IBM PC/XT ET3000
SCSI Controller Card IBM PC/XT 8-bit ISA Procom CC-8
ATI Rage128 PCI Card 109-57400-00 600-7055-A 820-1012-A
MCA Adapter Card Intervoice Fonetower 250046-E 100090
IBM POS Motherboard 31L3189 02L1625 4694 4614 A738-E
M701 Pentium Pro Motherboard 4 ISA 4 PCI Intel 440BX BX
DEC Vax MicroVax 3100 54-18856-04 KA41-D MV3100/20E MB
SCSI Hard Disk Quantum ProDrive 105S 910-10-9403 50pin
SCSI Hard Disk 50-pin Quantum ProDrive 1080S
SCSI Hard Disk Seagate Hawk ST12400N 949001-026 Q-01-94
