P-HB-AIN-2200C100 AIN-220 | ABB Analog Input Module

The AIN-120 block uses a single successive approximation analog-to-digital converter through which all channels are multiplexed. This type of A/D conversion method is fast (ten microseconds per conversion), which allows multiple channels to be sequentially multiplexed through one converter. Redundancy provides a backup analog-to-digital conversion. The AIN-200, AIN-220, and AIN-300 blocks have dedicated Delta-Sigma analog-to-digital converters on each channel. These converters are slower (50 milliseconds per conversion); however, no multiplexing is required since each channel performs independent conversions. The converters also have built-in digital signal processing which provides low pass filtering. The AIN-200,AIN-220, and AIN-300 blocks have optically isolated input channelsThe AIN-120 block uses a floating point digital signal processor (DSP) to achieve low pass filtering. The advantage to using a DSP device for this function is that significant noise rejection can be achieved (better than 70 dB) while maintaining fast settling time to an input step response (75 milliseconds). As stated previously, the Delta-Sigma analog-to-digital converters used in the AIN-200, AIN-220, and AIN-300 blocks have built-in digital signal processing which provides low pass filtering