PID

(redirected from Pids)
Also found in: Dictionary, Thesaurus, Medical, Acronyms.

PID

PID

(1) (Process IDentifier) A temporary number assigned by the operating system to a process or service.

(2) (Proportional-Integral-Derivative) The most common control methodology in process control. It is a continuous feedback loop that keeps the process flowing normally by taking corrective action whenever there is any deviation from the desired value ("setpoint") of the process variable (rate of flow, temperature, voltage, etc.). An "error" occurs when an operator manually changes the setpoint or when an event (valve opened, closed, etc.) or a disturbance changes the load, thus causing a change in the process variable.

The PID controller receives signals from sensors and computes corrective action to the actuators from a computation based on the error (proportional), the sum of all previous errors (integral) and the rate of change of the error (derivative). See PAC.


Inputs from a PID
The large white boxes are Opto 22 SNAP PACs, which are programmable automation controllers that are processing the PID loops in Chevron's research facility in Richmond, Virginia. The wires come from thermocouples that sense pipe temperature in a laboratory test that analyzes the best way to break down crude oil. The PACs determine when to raise and lower the temperature, and the three modules with the black sockets send digital signals to the heaters (cables not connected in this image). (Image courtesy of Opto 22, www.opto22.com)
References in periodicals archive ?
This, right away, would demonstrate increased overall welfare,' PIDS said.
According to the UNHRC, most of the 8,745 PIDs are in Sarangani (3,155), while 2,777 are in Davao del Sur.
The state audit agency disclosed that the PIDS purchased from the National Housing Authority (NHA) a parcel of land in Quezon City that later turned out to be a portion of the Philippine Children's Medical Center (PCMC).
Considering that the numbers of patients wiht other PIDs with a severe course including hyper IgM, SCID and hyper IgE are limited in terms of statistical significance, it is not surprising that PIDs with a more severe course are found in severe infections.
Recipients were asked to complete the survey or forward it to other PIDs in their organization as appropriate.
CAG says it opted for the AgilFence PIDS after a consultancy study conducted in 2010 looking at ways to enhance perimeter security.
Contributions of PID to other fields of medicine: Winkelstein concluded his seminars to nurses by identifying some of the significant therapies developed over the years as a direct result of research con ducted for the benefit of patients with PIDs.
The second and the preferred option is to pursue tariffication, with revenues earmarked as safety net for rice farmers,' Pids said.
Specifically, 'a 35-percent tariff rate seems appropriate as a tariff equivalent,' PIDS recommended.
The Bureau of Civil Aviation and Security (BCAS), which monitors security at Indian airports, has plans to make all airports in India install PIDS gradually.