New flexibility for low- to mid-complexity applications

The new generation of programmable control relays can be compared with micro PLCs

Simple machine building projects can quickly become more complex when they are undergoing design revisions. In the past, traditional control relays could get to their limits of functionality or connectable I/O. The new generation of intelligent control relays is breaking these boundaries with notably more connectable I/O, fast Ethernet and web server functionality and modular programming using structured text. These smart relays today provide an extremely competitive alternative to small PLCs.

Read what an eminent expert writes about getting a better performance using function blocks

Control relays were not considered for use in automation projects for a long time - their possibilities were too limited. Ulrich Kanngießer author of various textbooks on small controls and about programming with structured text examines the possibilities of modern control relays in his white paper. Using the example of Eaton's easyE4 control relay, he demonstrates how, in many cases, high-performance control relays can become an alternative to a small PLC thanks to the use of multiple programming languages, modular software concepts in combination with flexible hardware with multiple I/O options.

Traditional small controls often can’t cope if a customer application grows more complex over time. With its 11 expansion modules and flexible programming in ST, the easyE4 has much more to offer in this regard. The Ethernet connection not only makes it possible to connect various devices and touch panels of all sizes, but it can also be used to integrate applications into larger IT networks or even to connect them to the cloud.

In addition, the easyE4’s NET connection makes it possible to design modular systems without creating additional traffic on the Ethernet network. With the easy communication module for SmartWire-DT (SWD), the advantages of the powerful control relay are also available connected to the intelligent wiring system in an ideal way.