ABB 5SHY3545L0014 3BHE023784R0001工控控制卡件
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事实证明，网络问题很难解决（续）。使用示波器检查通信信号是否异常。•示波器必须为差动或电池操作型。•探头的最小输入电阻必须为1Mohm，输入电容必须小于1000pF。断开网络的各个部分，包括通过PM8xx处理器单元的以太网端口，直到其缩小到能够正常工作的大小。•应使用手持式现场总线主机在网络中的不同点进行连接。•通过一次重新连接一个区段来查找不可用区段。在最坏的情况下，可能需要逐个移除设备以识别故障项目。•可以使用数字电压表的欧姆表（电阻）功能检查电缆。检查前，隔离电源并断开所有其他设备。•对于大型网络，应使用网络分析仪。分析仪必须适用于基金会现场总线网络。PM8xx正在传输，Tx1/Tx2 LED闪烁，但连接的设备未接收数据。或连接的设备正在传输，但Rx1/Rx2 LED不闪烁。•检查通信接口电缆是否已连接。•检查手抖信号。Tx/Rx信号与传输同时闪烁，但连接的设备未正确接收消息。•检查所连接设备的波特率、奇偶校验、数据和停止位数是否符合规定。•检查握手过程是否符合两端的规定。•检查控制器和连接的设备中的驱动程序是否足够。•断开控制器的电源，等待片刻，然后再次通电。•停止程序并启动PM8xx处理器单元的复位信号（INIT）。
The network problem is proving very difficult to solve (continued). Use an oscilloscope to check the communication signals for abnormalities. • The oscilloscope must be of differential or battery operated type. • Probes must have a minimum of 1 MOhm input resistance, and less than 1000 pF input capacitance. Disconnect sections of the network, including the Ethernet port via the PM8xx processor unit, until it is reduced to a size that functions correctly. • A hand-held fieldbus master unit should be used to make connections at different points in the network. • Locate the unserviceable section by reconnecting the sections one at a time. In the worst possible case, it may be necessary to remove devices one by one to identify the faulty item. • Cables can be checked using the ohmmeter (resistance) function of a digital voltmeter. Isolate the power supply and disconnect all other devices before making the check. • For large networks, a network analyzer should be employed. The analyzer must be suitable for use on FOUNDATION Fieldbus networks.The PM8xx is transmitting and the Tx1/Tx2 LEDs are flashing, but the connected device is not receiving data. OR The connected device is transmitting, but the Rx1/Rx2 LEDs are not flashing. • Check that the communication interface cable is connected. • Check the hand-shake signals. The Tx/Rx signals are flashing concurrently with transmission, but the messages are not being received correctly by the connected device. • Check that the baud rate, parity, and number of data and stop bits are as specified for the connected device. • Check that the handshake procedures are as specified at both ends. • Check that the driver routines are adequate, both in the controller and the connected device. • Disconnect power to the controller, wait a moment and then power-up again. • Halt the program and initiate a reset signal (INIT) from the PM8xx processor unit.
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