描述
开关量：按电压水平分，有220VAC、110VAC、24VDC，按隔离方式分，有继电器隔离和晶体管隔离。
模拟量：按信号类型分，有电流型（4-20mA,0-20mA）、电压型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。
除了上述通用IO外，还有特殊IO模块，如热电阻、热电偶、脉冲等模块。
按I/O点数确定模块规格及数量，I/O模块可多可少，但其最大数受CPU所能管理的基本配置的能力，即受最大的底板或机架槽数限制。
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NETAPP DS14 MK2 AT 14 X 1TB SATA TO FC AT-FCX 14TB
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Netapp FAS3070 w/2x DS14MK2 X275A-R5 144GB 15K 4TB!!
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5pcs of Netapp DS14 MK2 w/14x 300GB 10K X276A 21TB!!!!
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NetApp FAS980 Filer w/2x DS14MK2 14x 300GB 10K X276A
NetApp FAS270 14x X276A 300GB NFS CIFS ISCSI MULTISTORE
NetApp FAS270 w/14 X274A 144GB 6 Transferable Licenses
