Programmable Logic Controllers: ... which is used here as a set coil, turns on. On line three of the ladder diagram, C1 is instantiated as a normally-open contact and when closed, turns on output coil ...

Ladder logic is the basis of most control functions. Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past, ladder logic was made possible with discrete relays and ...

The PuffinPLC Project is an effort to produce a Linux-based GNU Public Licensed Programmable Logic Controller (PLC). PLCs were developed in the 1960s to replace the complex electrical relay circuits ...

There is a wide assortment of cheap development (dev) boards for Complex Programmable Logic Devices (CPLD), the smaller cousin of the Field Programmable Logic Array (FPLA) Using an inexpensive boar… ...