描述
外接触点接通或图中的NPN型晶体管饱和导通时，电流经24V电源的正极(24V端子)、S／S端子、内部电路、X0等输入端子和外部的触点或晶体管，从0V端子流回24V电源的负极，使光耦合器中两个反芳联的发光二极管中的一个亮，光敏三极管饱和导通，CPU在输入阶段读入的是数字1；外接触点断开或．NPN晶体管处于截止状态时，光耦合器中的发光二极管熄灭，光敏三极管截止，CPU在输入阶段读入的是数字0。
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NetApp X267A-R5 500GB SATA Disk DS14Mk2-AT 108-00088 –
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NETAPP 144GB 15K SP-275A SP-275A-R5 X275A-R5 MK2
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NetApp X6503A .5m Shelf to Shelf FC-AL Cable 112-02115
NetApp X6520 Optical SC Loopback Plug Network Appliance
NetApp X6521 Optical LC Loopback Network Appliance
NetApp X6522 FC-AL HSSDC2 Loopback Network Appliance
Netapp F-Series Filer Power Supply 108-01164
Netapp (qLogic) optical FCAL FC0210402
NETAPP X276_S10K7288F10 300GB 10K X276A-R5 108-00083
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NETAPP 300GB,10K RPM,UNV FC DISK DRIVE,R5 X276A-R5
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