In critical industrial and commercial systems, downtime is not merely inconvenient; it is costly. For operations that depend ...

The arrangement follows so-called “relay logic,” which was usually presented in a schematic as a ladder diagram. (See Fig. 3.) In a tube-type transmitter, the control system usually starts with a ...

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 ...