In today's industrial automation systems, programmable logic controllers (PLCs) play a central role.
They connect measuring instruments and actuators connected to the process via conventional wiring.
However, a PLC is not completely decoupled from the industrial environment, so that over-voltage peaks and transition currents can affect its functionality.
In order to adapt the applied voltage and/or current and to provide the PLC with a suitable galvanic isolation, the appropriate interface should be installed for each starting point, which regulates the voltage and current level as well as offers a separation protection.
Such interfaces are offered by ABB's relay and optocoupler series.
They allow a wide adjustment of the voltage (from 5 to 250 V) and current (from 0.
01 to 8 A) as well as a high insulation between input and output from 2 to 4 kV.
Transistor, MOS-FET or Triac outputs can be selected for high switching frequencies at low switching loads.
This text is machine translated.