1756-IF16 A 支持三(3)种类型的信号布线配置

1756-IF16 A 支持三(3)种类型的信号布线配置

Allen-Bradley 1756-IF16是一个ControlLogix模拟输入模块。该模块接受电流和电压信号，如10V、0-10V、0-5V和0-20 mA。该模块支持三(3)种类型的信号布线配置，如单端、差分和高速差分布线。在支持的布线配置中，单端布线对噪声最敏感，必须与具有公共接地的信号一起使用。为了提高噪声敏感度，使用差分布线方法，而高速差分布线用于需要相对于输入信号快速更新数据的系统。

使用单端接线，模块成为十六(16)通道模拟输入模块。类似地，当使用差分接线时，该模块被简化为八(8)通道模拟输入模块。此外，当模块作为高速差分接线时，模块成为四(4)通道模拟输入模块。

1756-IF16单个分辨率为320V/计数(15位+符号双极性)@ 10.25V输入范围；160V/计数(16位)@ 0-10.25V输入范围；在0-5.125V输入范围时每计数80V(16位)，在0-20.5 mA时每计数0.32 A(16位)。该模块具有变化的扫描时间，例如单端的16-488 ms；使用差分布线时为8-244毫秒，使用高速差分布线时为5-122毫秒。它内置一个采用适马-德尔塔法的模数转换器电路。转换后的数据按照整数模式(左对齐，2 s补码)IEEE 32位浮点数据格式存储。该模块的校准精度优于电压输入范围的0.05%和电流输入范围的0.15%。

1756-IF16可使用三种不同的方法接线，具体取决于用户和应用的要求，如单端接线、差分接线和高速模式差分接线。当所有输入设备都连接到公共接地时，单端接线方法是最佳选择。这是为了将信号输入的一侧与信号地进行比较，以获得差值，然后模块使用该差值为控制器生成数字数据。当应用没有公共接地或可能有单独的信号对时，建议使用差分布线方法。这种布线方法也适用于需要提高抗扰度的环境。差分模式下的通道并不完全相互隔离。如果多个差分输入信号具有不同的电压公共基准，则一个通道可能会影响另一个通道的读取。发生这种情况时，用户应该将输入连接到不同的模块上，或者用隔离输入模块替换非隔离模块。此模式允许8个连接。最后，高速模式差分布线方法可以实现最快的数据更新。但是，用户需要满足某些条件才能使用高速模式。首先，它使用差分布线方法。第二，在这种模式下，只能使用模块上每四个通道中的一个。1756-IF16模块的功耗为2.3瓦，背板总功率为2.33瓦。输入范围为10伏、0至10伏、0至5伏或0至20毫安。

该模块在5.1伏电压下的电流消耗为150毫安，或在24伏电压下为65毫安。底板的额定电压和电流为5.1伏DC，最大150毫安，24伏DC，最大65毫安。输入电流范围从4到20毫安，输入电压范围从-10到10伏，并限制在100伏安。电压功耗约为2.3瓦，电流功耗为3.9瓦。电压的热耗散为7.84 BTU/小时，电流的热耗散为13.3 BTU/小时。它还具有30伏DC(电压)和8伏DC(电流)的最大过压保护。

1756-IF16 A 支持三(3)种类型的信号布线配置

Allen-Bradley 1756-IF16 is a ControlLogix analog input module. The module accepts current and voltage signals such as 10V, 0-10V, 0-5V and 0-20 mA. The module supports three (3) types of signal routing configurations such as single-ended, differential, and high-speed differential routing. Of the supported wiring configurations, single-ended wiring is the most sensitive to noise and must be used with signals with common ground. In order to improve noise sensitivity, differential wiring methods are used, while high-speed differential wiring is used in systems where data needs to be updated quickly relative to the input signal.

Using single-ended wiring, the module becomes a sixteen (16) channel analog input module. Similarly, when using differential wiring, the module is reduced to an eight (8) channel analog input module. In addition, when the module is wired as a high-speed differential, the module becomes a four (4) channel analog input module.

1756-IF16 Single resolution 320V/ count (15-bit + sign bipolar)@ 10.25V input range; 160V/ Count (16 bits) @0-10.25V input range; 80V(16 bits) per count at 0-5.125V input range, 0.32A (16 bits) per count at 0-20.5mA. The module has variable scan times, such as 16-488 ms single-ended; 8-244 ms when using differential wiring and 5-122 ms when using high-speed differential wiring. It has a built-in analog-to-digital converter circuit using the Sigma Delta method. The converted data is stored in integer mode (left justified, 2 s complement)IEEE 32-bit floating-point data format. The module's calibration accuracy is better than 0.05% of the voltage input range and 0.15% of the current input range.

The 1756-IF16 can be wired using three different methods, depending on user and application requirements, such as single-ended wiring, differential wiring, and high-speed differential wiring. When all input devices are connected to common ground, the single-ended wiring method is the best choice. This is to compare the side of the signal input to the signal ground to obtain a difference, which is then used by the module to generate digital data for the controller. Differential wiring methods are recommended when applications have no common ground or may have separate signal pairs. This wiring method is also suitable for environments where immunity needs to be improved. The channels in differential mode are not completely isolated from each other. If multiple differential input signals have different voltage common references, one channel may affect the reading of the other. When this happens, the user should either connect the input to a different module or replace the non-isolated module with an isolated input module. This mode allows 8 connections. Finally, the high-speed mode differential routing method can achieve the fastest data update. However, users need to meet certain conditions to use high-speed mode. First, it uses a differential wiring method. Second, in this mode, only one of every four channels on the module can be used. The 1756-IF16 module consumes 2.3 watts and the backplane has a total power of 2.33 watts. The input range is 10 volts, 0 to 10 volts, 0 to 5 volts, or 0 to 20 MA.

The module has a current consumption of 150 mA at 5.1 volts, or 65 mA at 24 volts. The base plate is rated for voltage and current of 5.1 V DC with a maximum of 150 mA and 24 V DC with a maximum of 65 mA. Input current ranges from 4 to 20 mA, input voltage ranges from -10 to 10 volts, and is limited to 100 voltamps. Voltage consumption is about 2.3 watts and current consumption is 3.9 watts. The thermal dissipation of the voltage is 7.84 BTU/ hour, and the thermal dissipation of the current is 13.3 BTU/ hour. It also has a maximum overvoltage protection of 30 volts DC(voltage) and 8 volts DC(current).