FOXBORO FCM10E P0914YM通信模块
如第7页至第13页的接线图所示，这些输出位于端子25至28，共用端子24。应使用屏蔽电缆，仅屏蔽一端接地，以尽量减少噪声影响。信号和电源电路是内部隔离的，允许以不同于PQM的接地电位连接到设备（PLC、计算机等）。然而，每个端子都被箝位至接地±36 V。2.2.8模拟输入（可选）端子22（–）和23（+）用于电流信号输入。该电流信号可用于监测任何外部量，如变压器绕组温度、电池电压、电站服务电压、变压器抽头位置等。0至20 mA范围内的任何传感器输出范围均可连接至PQM的模拟输入端子。有关模拟输入编程的详细信息，请参见第29页第4.3.3节：模拟输入。
As shown in wiring diagrams on pages –7 to –13, these outputs are at Terminals 25 to 28 and share Terminal 24 as their common. Shielded cable should be used, with only one end of the shield grounded, to minimize noise effects. Signals and power supply circuitry are internally isolated, allowing connection to devices (PLCs, computers, etc.) at ground potentials different from the PQM. Each terminal, however, is clamped to ±36 V to ground. 2.2.8 Analog Input (Optional) Terminals 22(–) and 23(+) are provided for a current signal input. This current signal can be used to monitor any external quantity, such as transformer winding temperature, battery voltage, station service voltage, transformer tap position, etc. Any transducer output ranges within the range of 0 to 20 mA can be connected to the analog input terminals of the PQM. See Section 4.3.3: Analog Input on page –29 for details on programming the analog input.
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