A device that prevents a machine from initiating an operation until a condition or set of conditions is fulfilled.

An instrument which will not produce any spark or thermal effects under normal or abnormal conditions that will ignite a specified gas mixture.

A version of Ethernet that operates over twisted-pair wire at a speed of 10 Mb/s. IOBASE-T networks with more than two terminals must use an Ethernet hub and a star topology.

A stand-alone pocket of automation, such as a robot, CAD/CAM system or CNC machine, that is not connected into a cohesive system.

Principally a programming language, but it has been designed by Sun Microsystems to function as a complete computer operating system. The purpose of the language has been twofold: to create a single standard that will run on a variety of competing computer systems, and to solve vexing computer security problems introduced by the widespread reliance on computer networks, which are vulnerable to malicious programs like viruses.

To generate motion (continuous or incremental) whenever an operator-activated switch is closed.

An instruction that causes the processor to deviate from executing instructions in order, by jumping to another place in the program.

The point in a thermocouple where the two dissimilar metals are joined.