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1756-PA72/C交流电源模块
设置输入平均投资可以补偿杂散噪声和其他形式的振幅通过制作最新输入样本来通过模拟输入滤波器的调制移动平均值的一部分&数字滤波的一种形式。这种移动平均技术对更新间隔没有影响。
下表显示了用于在七个输入平均值中进行选择的Sw–B设置8和4电路配置的采样周期。
除平均采样外，Sw–B还具有其他功能；开关B7设置为ON对于二进制代码输出或对于A组的十进制代码输出为OFF（输入1-48电路模式和4电路模式中的输入1-2）。开关B8的作用相同对于B组，由于模块在出厂时经过校准，设计者的意图是10 V参考电压调整将有效一年。它应该是此后每年重新校准。
需要以下工具来调整模块的参考电压：精度为0.0001 V、电压为10 V的精密数字读数伏特计
刻度：6-1/2位，保证4位计数精度。
一把1/8英寸的薄刃螺丝刀。
一把小头十字螺丝刀。用粘合剂（如Loctite或Glyptol）固定微调电位器调整螺钉注意：在重新校准过程中，现场接线可能会保持连接，因为模块的工作状态和参考电压调整不相互影响。
模块不需要预热即可达到温度。使用下表安装模块。
步骤操作
1从装运箱中取出模块并检查是否损坏。如果发现损坏，请联系分销商（或销售人员）正确的返回程序。
2确保从外壳上断开电源。
3按如下方式配置开关组A：A-1至A-6适用于预期八或四电路配置的预期输入电压范围A7选择八路或四路输入模式。A8至ON，用于正常操作。
4按如下方式配置交换机组B：B-1至B-6，适用于八或四电路配置的所需输入平均样本数上面指定的。B7选择输出代码格式
5如果使用键销（随外壳装运提供），则将其安装在为此选择的外壳槽的上方和下方模块的安装。
6打开手柄，将模块插入外壳，将边缘连接器牢牢固定在底板上。
7使用模块前面板顶部和底部的固定安装螺钉固定模块。
8参考下面的现场连接器/输入电路引脚分配图。将现场侧接线连接到双现场连接器（位于（位于左侧、前缘），根据需要铺设成扇形的电缆。注：使用现场连接器接线尺寸AWG-20（含）（实心或绞合）。
9如果正在使用电流检测输入电路，将现场连接器上的相应电流检测端子跨接至相应的热输入（+），如下面的现场连接器/输入电路引脚分配图所示。
注：应终止未使用的输入，以减少因浮动输入而产生的电气噪声和其他干扰线将未使用的电压和电流端子（包括屏蔽）跨接至外壳接地。外壳接地仅为如果H8XX外壳接地，则有效。屏蔽的两端不能连接到设备和模块，除非设备屏蔽是设备输入电路的一部分，并且未在内部连接到设备外壳接地。
注意：
如果需要超范围和欠范围检测，并且此检测会导致吞吐量问题未使用的通道（因为它们浮动或峰值超出范围），然后未使用的电压或电流通道现场连接器应与有效输入通道并联。只要有效通道保持在范围内，绑定频道也将保持在范围内。
注：对于4-20 mA范围内的电流，只有有效输入需要包含250Ω 电阻器。
10参考下面的现场连接器安装图。用针脚1将两个有线现场连接器安装在模拟模块上位于顶部，现场接线位于左侧。
11关闭模块手柄。
12如果需要，打开壳体电源。
注：如果在电压模式下操作时出现断路，输入可能需要几秒钟才能衰减至零，由于前端RC网络。如果需要开路检测，模块应在当前模式。添加250Ω 电阻器迫使RC网络快速放电
Setting Input Averaging
It is possible to compensate for spurious noise and other forms of amplitude modulation coming through the analog input filter by making the latest input sample part of a moving average–a form of digital filtering. This moving average technique has no affect upon the update interval. The following tables show Sw–B setting for selecting among seven input average sample periods for both 8 and 4 circuit configurations. Sw–B has other functions in addition to average sampling; Switch B7 is set to ON for binary code output or OFF for decimal code output for Group A (inputs 1-4 in the 8 circuit mode and inputs 1-2 in the 4 circuit mode). Switch B8 does the same for Group B.Since the module is shipped factory-calibrated, it is the designer’s intention that the 10 V reference voltage adjustment will be good for one year. It should be recalibrated annually thereafter. The following tools are needed to adjust the module’s reference voltage: A precision digital readout voltmeter with an accuracy of 0.0001 V on a 10 V scale: 6-1/2 digits, to guarantee 4 bit count accuracy. A 1/8-inch bit, thin-blade screwdriver. A small-bit Phillips-head screwdriver. An adhesive (such as Loctite or Glyptol) to secure trim-pot adjustment screws Note: Field wiring may remain connected during the recalibration procedure, as the module’s working state is not interactive with the reference voltage adjustment. Also, the module does not require warmup to attain temperature.
Use the following table to install the module.
Step Action 1 Remove module from shipping box and check for damage. If damage found, contact distributor (or sales person) for correct return procedure. 2 Ensure that power is removed from housing. 3 Configure switch bank A as follows: A-1 through A-6 for desired input voltage ranges appropriate to the intended eight- or four-circuit configuration A7 to select eight- or four-circuit input mode. A8 to ON for normal operation. 4 Configure switch bank B as follows: B-1 through B-6 for desired number of input averaging samples appropriate to eight- or four-circuit configuration designated above. B7 to select output code format 5 If using key pins (provided with housing shipment), install them above and below housing slot selected for this module’s installation. 6 Open handle and insert module into housing, firmly seating edge connector in backplane. 7 Secure module using captive mounting screws at top and bottom of module’s front panel. 8 Refer to field connector/input circuit pinout diagram, below. Connect field side wiring to double field connector (located on left side, front edge), laying in cable fan-out as desired.
NOTE:
Use field connector wiring sizes AWG—20 inclusive (solid or stranded). 9 If current sense input circuit(s) is being used, jumper appropriate current sense terminal on field connector to corresponding hot input (+) as shown in field connector/input circuit pinout diagram, below. NOTE: Unused inputs should be terminated to reduce electrical noise and other interference due to floating input lines. Jumper unused voltage and current terminals (including shields) to case ground. Case ground will only be effective if H8XX housing is connected to earth ground. Both ends of the shield cannot be connected to the device and module, unless the device shield is part of the device input circuit, and is not connected internally to the device case ground. NOTE: If over-range and under-range detection is required, 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. NOTE: For currents within the range of 4—20 mA, only the valid input requires the inclusion of the 250 Ω resistor. 10 Refer to field connector mounting drawing, below. Mount two wired field connectors on analog module with pin 1 positioned at top and field wiring to left. 11 Close module handle. 12 Turn on power to housing if desired. NOTE: If an open circuit occurs when operating in the voltage mode, the input may take several seconds to decay to zero, due to the front-end RC network. If open-circuit detection is required, the module should be operated in the current mode. The addition of the 250 Ω resistor forces the RC network to discharge rapidly
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