UR8LH | GE MULTLIN | power supply module

Description

UR8LH | GE MULTLIN | power supply module

Simply put, a passive dry contact is a signal transmitter that only needs to provide a pair of passive contacts. The signal receiver forms its own current circuit, and the dry contact of the signal transmitter only needs to play the role of “disconnecting” and “connecting” this circuit. The advantage of this type of contact is that the signal transmitter does not need to know the signal voltage, current, and polarity required by the signal receiver. As long as the signal receiver’s contact is “conducting” and “disconnecting”, the switch signal can be transmitted to the receiver. The disadvantage of this type of contact is that the signal transmitter and receiver have not done electrical isolation, which may cause crosstalk.
Simply put, an active wet contact is where the signal transmitter provides an independent current circuit to trigger the switch at the signal receiver (such as an OPT optocoupler). The advantage of doing so is that the signal transmitter and receiver each go through their own current circuit, with optocouplers used in the middle to achieve optical isolation. The disadvantage is that the signal transmitter needs to know the voltage and current range and polarity required by the receiver (although mainstream PLCs generally use bipolar optocouplers, and the voltage range of optocouplers is also relatively wide, requiring only weak current consumption, so the problem is not significant).