Need for Programmable Input Filters in an Oil Refinery Application
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This document is part of a comprehensive tutorial on Industrial Digital I/O and Counter/Timer hardware. Learn about National Instruments product offerings for digital and timing I/O, the Industrial Feature Set including watchdog timers and isolation, complementary devices like relays, solenoids and encoders, concepts like sinking and sourcing, and see how these devices can be used in your industrial application.
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Need for Programmable Input Filters in an Oil Refinery Application
In oil refineries, a key switch may be used to activate the flow of crude oil into a chamber for refining. The switch, however, tends to exhibit a lot of bouncing / chatter. Much like a ball bouncing on a hard surface, one of the metal contacts will tend to bounce when it is forced into the other contact. The repeated toggling of the signal would cause the affected pump to rapidly switch on and off. This can cause accelerated wear on the pump and eventually lead to a premature failure. Programmable Input Filters remove noise, glitches, and spikes on inputs, and also provide debouncing for digital switches and relays. This is important for applications in noisy industrial environments like oil refineries to prevent false readings based on chatter.
Recommended Products that Feature Programmable Input Filters
NI 6509
NI 6514
NI 6515
NI 6528
Learn More About Programmable Input Filters
The Industrial Feature Set: Programmable Input Filters
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