Programmable logic device

PLCs originated in the car industry in the 1970s where programmable logic devices were used to do repetitive tasks. Within the pharmaceutical industry, their use has evolved over the past 20 years as their processing power has increased. Complex nonrepetitive tasks are now routinely performed, and as a consequence PLCs are now used to control the majority of medium-sized manufacturing facilities. The worldwide market for PLCs has been estimated to be on the order of 3 billion. 

FPGA Field-Programmable Gate Array. Programmable logical device. 

Titled DesignAssurance Guidance for Airborne Electronic Hardware , this document addresses hardware such as Circuit Board Assemblies custom micro-coded components [e.g., ASICs and Programmable Logic Devices (PLDs)] integrated technology... 

Airborne Electronic Hardware Electronic airborne hardware includes fine replaceable units, circuit board assemblies, application-specific integrated circuits, programmable logic devices, etc. [RTCA/DO-254]. 

Programmable Logic Devices Reducing Propagation Delays... 

Programmable logic devices (PLD) A class of 1C products which are easy to customize for a particular application. 

FIGURE 8.43 A simplified complex programmable logic device structure. 

ASICs can be classified into the following three categories (1) full custom, (2) semicustom, and (3) programmable logic devices (PLDs). 

Chemical and physical property measnrements Ionizing radiation levels Nonionizing radiation levels Overriding antomatic controls Large-scale compnter control systems Microprocessor control systems Programmable logic devices Internet-enabled controls, monitoring, and health Software controls... 

Complex Programmable Logic Device Central Processing Unit... 

A set of PCB (printed circuits boards) based on PLD (programmable logic devices) act as the interface between the embedded PC system, the encoders, and the DC motors. The interface between the PLD boards and the PC is carried out by the parallel port. 

Interface Control Level This control level is restricted to strategies of control associated with the interfaces of the sensor and actuators. The strategies at this level are implemented by the hardware through PLD (Programmable Logic Devices). 

---