1326AS-B440G A-B Control Unit
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The MicroLogix analog input filter is programmable. The slower the filter setting, the more immune the analog inputs are to electrical noise. The more immune the analog inputs are to electrical noise, the slower the inputs will be to update. Similarly, the faster the filter setting, the less immune the analog inputs are to electrical noise. The less immune the analog inputs are to electrical noise, the faster the inputs will be to update.The total update time for each channel is a combination of the Update Time and the Settling Time. When more than one analog input channel is enabled, the maximum update for each channel is equal to one ladder scan time plus the channel’s Update Time plus Settling Time. When only one analog input channel is enabled, the maximum update for the channel is equal to the Update Time plus one ladder scan time.The analog input channels incorporate on–board signal conditioning. The purpose of this conditioning is to reject the AC power line noise that can couple into an analog input signal while passing the normal variations of the input signal. Frequency components of the input signal at the filter frequency are rejected. Frequency components below the filter bandwidth (-3 dB frequency) are passed with under 3 dB of attenuation. This pass band allows the normal variation of sensor inputs such as temperature, pressure and flow transducers to be input data to the processor. Noise signals coupled in at frequencies above the pass band are sharply rejected. An area of particular concern is the 50/60 Hz region, where pick–up from power lines can occur.
The structure and details of the product：
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