A Programmable Logic Controller (PLC) is a specialized computing system widely used to control real-time industrial processes and assemblies. The block diagram of a generic PLC is shown in Figure 1.

In Part III of this series, we examined PLC programming methods (ladder logic and functional block diagram), and how the objects (coils and contacts) are system variables stored in the PLCs memory. We ...

A human machine interface (HMI) connected to a separate programmable logic controller (PLC) is the standard system for machine automation. However, combining PLC processing and HMI monitoring and ...

Unitronics — in an effort to satisfy market needs and customer requests — now offer several new I/O configurations to both Samba and Jazz lines of all-in-one PLC+HMI controllers. These lines are ...

For applications combining traditional automation, multi-axis coordinated motion control, and a need for data handling, a motion-optimized PLC platform provides an elegant and streamlined solution.