Programmable logic controllers (PLCs) play a central role in today's industrial automation systems. They connect measuring instruments and actuators connected via conventional cabling to the process. However, a PLC is not completely decoupled from the industrial environment, so overvoltage peaks and transient currents can certainly affect its functionality. In order to adjust the applied voltage and/or current and to provide the PLC with suitable galvanic isolation, the appropriate interface should be installed for each input/output point, which both regulates the voltage and current level and offers isolation protection. The relay and optocoupler series from ABB offer such interfaces. They allow a wide range of adjustment of the voltage (from 5 to 250 V) and current (from 0.01 to 8 A) as well as a high level of isolation between input and output of 2 to 4 kV. For high switching frequencies with low switching loads, transistor, MOS-FET or triac outputs can be selected.
| Property | Value |
| Number of contacts as changeover contact: | 2 |
| Rated control supply voltage Us at AC 50 Hz: | 230 V |
| Rated control supply voltage Us at AC 60 Hz: | 230 V |
| Rated control supply voltage Us at DC: | 230 V |
| Type of voltage for actuation: | AC/DC |
| Design of the electrical connection: | screw connection |
| Drive, polarity: | polarized |
| Height: | 67.5 mm |
| Width: | 12 mm |
| Depth: | 70 mm |
| Switching behavior of the drive: | monostable |
| Type of switching contact: | single contact |
| With positively guided contacts: | no |
| With removable terminals: | no |
| Complete device with base: | yes |
| Protection class (IP): | IP20 |
| Nominal current: | 8 A |
| With LED display: | yes |
