FOXBORO FBM241 P0914TG输入电压监视器
在模拟模式下，PQM将忽略在其输入端检测到的测量参数，并使用存储在S5测试\模拟设定点组中的模拟值自检：在PQM自检过程中检测到的任何异常情况，如硬件故障，都会导致自检指示灯亮起。PQM失去控制电源也会导致自检指示器亮起，表明不存在计量。3.2.3通信通信指示器监控RS485通信端口的状态。当没有通过后部串行端口端子接收到串行数据时，RX1/2指示灯熄灭。如果没有连接、串行线断开或主计算机处于非活动状态，则会出现这种情况。如果串行端口上有活动，但PQM未收到其内部编程地址的有效消息，则TX1/2指示灯保持关闭。
While in simulation mode, the PQM will ignore the measured parameters detected at its inputs and will use the simulated values stored in the S5 TESTING \ SIMULATION setpoints group. • SELF TEST: Any abnormal condition detected during PQM self-monitoring, such as a hardware failure, causes the SELF TEST indicator to be on. Loss of control power to the PQM also causes the SELF TEST indicator to turn on, indicating that no metering is present. 3.2.3 Communicate The COMMUNICATE indicators monitor the status of the RS485 communication ports. When no serial data is being received through the rear serial ports terminals, the RX1/2 indicators are off. This situation occurs if there is no connection, the serial wires become disconnected, or the master computer is inactive. If there is activity on the serial port but the PQM is not receiving valid messages for its internally programmed address, the TX1/2 indicators remain off.
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