In today's industrial automation systems, programmable logic controllers (PLCs) play a central role.
They connect instruments and actuators connected by conventional wiring to the process.
However, a PLC is not completely decoupled from the industrial environment, so surge spikes and transient currents can affect its functionality.
In order to adjust the applied voltage and/or current as well as provide the PLC with suitable galvanic isolation, the appropriate interface should be installed for each input/output point, which regulates the voltage and current level as well as provides isolation protection.
The relay and optocoupler series from ABB provide such interfaces.
They permit a wide adjustment of the voltage (from 5 to 250 V) and current (from 0.
01 to 8 A) as well as a high isolation between the input and output from 2 to 4 kV.
For high switching frequencies with low switching loads optionally transistor, MOS-FET or triac outputs can be selected.
This text is machine translated.