产品内容介绍
1756-A7/B机架
PC轮询模块并将值放入输入寄存器（30XXX）由程序员指定。每次模块通电时，它都会执行诊断测试，重置输入锁存器，并且对于每个信道，向控制器呈现值0000。价值通电后约三秒钟。然后模块将启动根据B873-002和B875-002中的计划转换输入吞吐量，第163页。模块后部有一个DIP开关。开关1和2不习惯于开关3可以设置为模块复位或模块运行。
它必须设置为模块运行位置，用于模块操作。开关4用于设置哪些数据模块将生成的值范围。
选择正常范围或升高范围在将模块插入住房有关设置DIP开关的键，请参阅下图。
安装单元从盒子中取出模块并检查是否损坏。如果发现损坏，请联系您的销售人员或分销商了解正确的退货程序。
将开关3设置为模块运行位置，将开关4设置为数据范围在将模块插入住房（参考开关设置，第155页）。模块中包括一个模拟连接器组件（B873的部件号AS-8533-001-002和B875-002的零件号AS-8533-002）。
连接器套件包括两个安装螺钉、一个导线管和其中一个（B873-002）或两个（B875-002）现场接线连接器。每个连接器有18个嵌入式开槽螺钉端子，可接受各种线规，但16至20建议现场接线使用仪表。如果超范围或欠范围检测对您的流程很重要，并且检测导致未使用通道的吞吐量问题（因为它们浮动或峰值超出范围）
现场连接器应并联至有效的输入通道。
只要有效通道保持在范围内，绑定通道也将保持在范围之内。
对于电流，4至20ma操作，有效输入是唯一需要250电路中的欧姆电阻器。
当H8XX壳体连接到接地时，壳体接地有效。
屏蔽两端不能连接到设备和模块。这个例外情况是设备屏蔽是设备输入电路的一部分内部未连接到设备外壳接地。B873-012和B875-012是模拟输入模块，可与984一起使用可编程控制器。这两个模块之间的唯一区别是B873-012有四个输入通道，B875-012有八个输入通道。
两个模块都接受-10至+10伏模拟信号的输入。输入已转换到一个数值，范围从0001到8191。0000或8192表示无效数据。（参考数据值参考图）该值直接与输入信号成比例。例如，-5V的输入电压会导致模块发送值2048。如果输入信号变为5V，模块发送值6144。（请参阅输入到输出数据转换表。）
The PC polls the module and places
the values into input registers (30XXX) designated by the programmer. Each time the module is powered up, it performs diagnostic tests, resets the input latches, and, for each channel, presents a value of 0000 to the controller. The value is present for approximately three seconds after power up. The module will then start converting the inputs according to the schedule found in the B873-002 & B875-002 Throughput Rate, p. 163.
There is a DIP switch located at the rear of the module. Switches 1 and 2 are not used. Switch 3 can be set to either Module Reset or Module Run. It must set to the Module Run position for the module to operate. Switch 4 is used to set which data value range the module will produce. Select either Normal Range or Elevated Range. Make sure you set Switch 3 and 4 before inserting the module into the housing. Refer to the figure below for a key to setting the DIP switch.
Installing the Module
Remove the module from the box and check for damage. If damage is found, contact your salesman or distributor for correct return procedure. Set switch three to the Module Run position, and Switch four to the data range selected for input - either Standard or Elevated - before inserting the module into the housing. (Refer to Switch Settings, p. 155).Included with the module is an Analog Connector Set (Part# AS-8533-001 for B873- 002 and Part# AS-8533-002 for B875-002). The Connector Set consists of two mounting screws, a wire duct, and either one (B873-002) or two (B875-002) field wiring connectors. Each connector has eighteen recessed slotted screw terminals and can accept various wire gauges, but 16 to 20 gauge is recommended for the field side wiring.If Over-range or Under-range detection is important to your process, and this detection is causing throughput problems with the unused channels (because they float or spike outside the range), then the unused voltage or current channels at the field connector, should be connected in parallel, to a valid Input channel. As long as the valid channel stays within range, the tied channels will also stay within range. For Current, 4 to 20ma operation, the valid Input is the only Input requiring the 250 Ohm resistor to be in the circuit. Case ground is effective when the H8XX housing is connected to earth ground. The shield cannot be connected, both ends, to the device and the module. The exception to this is where the device shield is part of the device input circuit, and is not connected internally to device case ground.
公司主营产品图展示
产品优势
1：国外专业的供货渠道，具有价格优势
2：产品质量保证，让您售后无忧
3：全国快递包邮
4：一对一服务
公司主营范围简介
PLC可编程控制器模块，DCS卡件，ESD系统卡件，振动监测系统卡件，汽轮机控制系统模块，燃气发电机备件等，优势品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各种进口工业零部件、欧美进口模块。
产品广泛应用于冶金、石油天然气、玻璃制造业、铝业、石油化工、煤矿、造纸印刷、纺织印染、机械、电子制造、汽车制造、塑胶机械、电力、水利、水处理/环保、锅炉供暖、能源、输配电等等
