Product:ABB 5STP17H4800 In Origianl Packing with Good Quality 5STP17H4800

AC800M series module, industrial robot spare parts DSQC series, Bailey INFI 90,800xA, Advant OCS withMaster Software, Advant OCS with MOD 300 software, Freelance - Distributed control system for the process industry

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In powered networks the alternating voltage is superimposed onto the DC voltage being used to power the devices. In either case, the fieldbus receive circuits look at only the alternating voltage. Positive voltage swings have one meaning, negative swings have the opposite meaning. Therefore, the fieldbus signal is polarized. Field devices must be connected so that they all see the signal in correct polarity. If a field
device is connected “backwards” it will see an inverted version of the alternating voltage and won’t be able to communicate. However, there are non-polarized field devices available. This field devices can be connected in either polarity across the network. The non-polarized devices are invariably network-powered, which provides a clue as to how they can work with either polarity

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