ABB FM9925A-E HIEE451116R1接口模块
清除能量：当开关输入分配给清除能量时，开关输入闭合将清除PQM中的所有能量数据。•清除需求：当开关输入分配给清除需求时，开关输入上的闭合将清除PQM中的所有需求数据。2.2.7模拟输出（可选）安装传感器选件时，PQM有四个电流输出（T20=4至20 mA，T1=0至1 mA，订单代码）。这些输出可以多路复用以产生8个模拟传感器。该输出是适合连接远程仪表、图表记录器、可编程控制器或计算机负载的电流源。使用具有2至40 mA电流输入的可编程控制器的4至20 mA选项。如果只有电压输入可用，则在PLC端子处使用缩放电阻器将电流缩放到等效电压。例如，在0至10 V输入端子两端安装一个500Ω电阻器，使4至20 mA输出对应于2至10V（R=V/I=10 V/0.02 a=500Ω）。电流水平不受总导线和负载电阻的影响，4至20 mA范围内的总导线和负荷电阻不得超过600Ω，0至1 mA范围内不得超过2400Ω。
CLEAR ENERGY: When a switch input is assigned to CLEAR ENERGY, a closure on the switch input will clear all Energy data within the PQM. • CLEAR DEMAND: When a switch input is assigned to CLEAR DEMAND, a closure on the switch input will clear all Demand data within the PQM. 2.2.7 Analog Outputs (Optional) The PQM has four current outputs when the transducer option is installed (T20 = 4 to 20 mA, T1 = 0 to 1 mA in the order code). These outputs can be multiplexed to produce 8 analog transducers. This output is a current source suitable for connection to a remote meter, chart recorder, programmable controller, or computer load. Use the 4 to 20 mA option with a programmable controller that has a 2 to 40 mA current input. If only a voltage input is available, use a scaling resistor at the PLC terminals to scale the current to the equivalent voltage. For example, install a 500 Ω resistor across the terminals of a 0 to 10 V input to make the 4 to 20 mA output correspond to 2 to 10V (R = V / I = 10 V / 0.02 A = 500 Ω). Current levels are not affected by the total lead and load resistance which must not exceed 600 Ω for the 4 to 20 mA range and 2400 Ω for the 0 to 1 mA range.
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