Overview of the AIM module
AIM2505A Technical Manual V2.03
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2.4.1 Voltage and current inputs
Each of the 10 voltage and current channels have similar measurement range.
Voltage inputs
The nominal input voltage range is -10...+10V. All the parameters are specified over
this range. Actual measurement range which is -12...+12V exceeds the nominal input
range and allows overrange detection. Measurement resolution is 13 bits and the
step size in the input register is 10 mV.
Current inputs
The current input is compatible with the industry standard 4...20mA current loops (2-
wire receiver according to the standard ANSI/ISA-50.1-1982 (R1992)). The nominal
input range is extended to -20...+20mA. All the parameters are specified over this
range. Actual measurement range which is -25...+25mA exceeds nominal input
range and allows overrange detection. Measurement resolution is 13 bits and the
step size in the input register is 10µA.
2.4.2 Frequency inputs
The frequency inputs can be used to measure frequency, pulse width ratio and pulse
count. The input frequency range is 0...16 kHz. The frequency accuracy is better
than 1000 ppm which is 16 Hz at full range. Frequency measurement resolution is
0.25 Hz.
2.4.3 Voltage supply outputs
Groups 1, 3 and 4 have output voltage supply pins that can be used to supply
voltage to external sensors or used to supply loop voltage to the current loops.
Output supply voltage is 15V nominal and it can supply 100mA current per group.
2.4.4 Module temperature and self tests
The module has a sensor that measures the temperature of the module continually
with 3 ºC (Celsius) accuracy, and informs the Coach Computer CPU about it.
When the module is installed in a rack and the power turned on, the module
performs memory tests on itself to make sure it is functioning correctly.
电压和电流的10个频道中的每一个都有相似的测量范围。
普通的电压输入范围是-10V到10V之间。所有参数都在此范围内指定。实际测
量范围是在-12V到12V的超标普通输入范围和允许的超标的区域。测量分辨率
为13位，在输入寄存器的步长为10毫伏。
频率输入可用于测量频率，脉冲宽度比和脉冲计数.输入频率的范围是0到16kHz。频率精度优于1000 ppm的16 Hz全量
程。频率测量分辨率为0.25赫兹。
组1，3和4有输出电压引脚，可用于供应电压外部传感器或用于提供回路电压的电流回路。输出电压一般是15V，它提供100mA电流
每组。
该模块具有一个传感器测量模块的温度持续3ºC（摄氏度）的精度，并通知给有关车厢电脑CPU。
当模块安装到机架上，电源打开，该模块对自己进行内存测试，以确保它的功能正确。