ABB AIN-220 P-HB-AIN-22010000 modular

ABB AIN-220 P-HB-AIN-22010000 modular

The SCANCON counter, whose activity is relevant only in Edge-Triggered mode, counts the number of SCANCON pulses. All modules being scanned enter Hold mode on the rising edge of their Hold Trigger signals, all of which should be the same. After the designated number of SCANCON pulses for a module, the module goes back into Track mode. For most applications, the count value of the SCANCON counter should be one.Analog Circuitry The SCXIbus provides analog power (±18.5 VDC minimum), which the SCXI-1140 regulates to ±15 VDC, a chassis ground (CHSGND), and an analog bus (AB0±) with a guard. AB0± buses the SCXI-1140 output to other modules via the SCXIbus. The guard guards the analog bus and you can connect it via jumper W12 to the chassis ground, to the data acquisition board input ground (AIGND), or leave floating (for example, if you make the connection on another board). Figure 3-6 illustrates the analog circuitry.

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