ABB ZMAC-541 3AUA0000065842 Relay input module

ABB ZMAC-541 3AUA0000065842 Relay input module

ZMAC-541 include higher receiver input impedance, increased generator drive and a greater common mode voltage range. The ZMAC-541 will operate with a common mode voltage (ground potential difference) of ±7 V peak. This means that the ground voltage difference between any two ZMAC-541s in a network can be up to 7 V. Since the signal grounds between RS-485 devices are normally not connected, problems caused by ground loop currents are virtually eliminated. This fact, along with the inherent common mode noise rejection of differential transmission, makes RS-485 a viable interface for multipoint communication in both data processing and industrial control applications. 

In the interval between the time when one transmitter releases the line and another transmitter becomes active, the line is "floating". During this floating period, noise can very easily be picked up by the RS-485 receivers. This will produce erroneous data on the RS-232 output. The software controlling the network will normally interrogate all received characters and thereby reject this noise input.

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