DEIF PPM/DGM热电偶输出模块
双列直插式开关SW3-回路模式
双列直插开关SW3启用或禁用ROM校验和，将环路识别为工厂环路或INFI-NET环路，识别节点中的NIS模块，并将环路通信速度设置为500千波特（工厂环路）、2兆波特（INFI-NET）或10兆波特（NFI-NET）。参考表3-3。在提供的空间中记录双列直插式开关SW3的设置。双列直插开关SW3极1决定了网络处理模块的兼容性。将极1设置为连接两个回路的节点的一个位置。对于所有其他节点类型，将极1设置为零。极点2启用或禁用ROM校验和。Bailey建议在安装NIS时启用校验和，以充分利用车载诊断。极3启用内部测试，正常运行时必须禁用该测试。极点4与极点3相结合，使得节点对其他节点来说似乎很忙。极5启用前面板LED的通道空闲状态显示。如果通道1空闲，A组LED将大约每秒闪烁两次。如果通道2空闲，B组LED将闪烁。通道空闲显示用于警告存在回路完整性问题。第六极启用排除正常NIS模块操作的诊断测试。极点7和8决定环路速度和环路模式。
双列直插式开关SW4-输入/输出模块地址和计数器
NIS模块的I/O地址可以从0到7。双列直插式开关SW4的一极至三极设置NIS模块的I/O模块地址。有关I/O模块地址设置，请参阅表3-4。极点4至8设置NIS模块使用A组和B组面板LED显示的板载事件和错误计数器的地址。表3-5列出了事件计数器。表3-6列出了错误计数器。在提供的空间中记录双列直插式开关SW4的设置。计数器使用计数器0A的示例跟踪接收的多播消息的数量，不包括那些始发的消息。要在前面板LED上显示此计数器，请按如下方式设置双列直插式开关SW4：极四=零、五=一、六=零、七=一和八=零NIS模块上有六个跳线，用于设置接收器模拟电路的通信速率。跳线位置见图3-1。所有六条跳线必须设置在同一位置。跳线设置说明丝网印刷在NIS电路板的左上角。跳线设置必须与双列直插式开关SW3的第七和第八极设置的通信速率相匹配。图3-2显示了在各种环路模式下跳线的引脚。此图显示了在面板位于左侧的情况下查看NIS电路板顶部时引脚的位置。
DIPSWITCH SW3 - LOOP MODE
Dipswitch SW3 enables or disables ROM checksums, identifies the loop as a Plant Loop or INFI-NET loop, identifies the NIS module in a node, and sets the loop communication speed to 500 kilobaud (Plant Loop), 2 megabaud (INFI-NET) or 10 megabaud (INFI-NET). Refer to Table 3-3. Record the dipswitch SW3 settings in the space provided. Dipswitch SW3 pole one determines network processing module compatibility. Set pole one to the one position for a node that connects two loops. Set pole one to zero for all other node types. Pole two enables or disables ROM checksumming. Bailey recommends that the NIS be installed with checksumming enabled to take full advantage of the on-board diagnostics. Pole three enables internal testing which must be disabled for normal operation. Pole four, in conjunction with pole three, makes the node appear to be busy to other nodes. Pole five enables the channel idle condition display for the front panel LEDs. If channel one is idle, the group A LEDs will flash on and off about twice per second. If channel two is idle, the group B LEDs will flash. The channel idle display is intended to serve as a warning that a loop integrity problem exists. Pole six enables diagnostic tests that preclude normal NIS module operation. Poles seven and eight determine loop speed and loop mode.
DIPSWITCH SW4 - I/O MODULE ADDRESS AND COUNTERS
The NIS module can have an I/O address from zero to seven. Poles one through three of dipswitch SW4 set the I/O module address of the NIS module. Refer to Table 3-4 for I/O module address settings. Poles four through eight set the address of the on-board event and error counters that the NIS module displays using the group A and B faceplate LEDs. Table 3-5 lists the event counters. Table 3-6 lists the error counters. Record the dipswitch SW4 settings in the space provided. Example of Counter Usage Counter 0A keeps track of the number of multicast messages received excluding those originated. To display this counter on the front panel LEDs, set dipswitch SW4 as follows: pole four = zero, five = one, six = zero, seven = one, and eight = zero There are six jumpers on the NIS module that set the communication rate of the receiver analog circuit. See Figure 3-1 for jumper locations. All six jumpers must be set in the same position. Jumper setting instructions are silk screened on the upper left corner of the NIS circuit board. The jumper setting must match the communication rate set by poles seven and eight of dipswitch SW3. Figure 3-2 shows which pins to jumper for various loop modes. This figure shows placement of the pins when looking at the top of the NIS circuit board with the faceplate on the left.
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