Twelve-channel isolated type speed measurement board card

• Main Authors: ZHANG DAOJUN, WEN XINFU, HU XIAOHUA, ZHOU DUODAO
• Format: Patent
• Language: Chinese; English
• Published: 27.04.2016
• Subjects: CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING

The invention provides a twelve-channel isolated type speed measurement board card. A XILINX XC95144XL-PQ100 CPLD programmable logic device is used, and chip selection decoding and logic operation are all programmed in the chip. Address lines, a data line and a control line from the internal part of a computer are connected to a CPLD, the address lines A4, A5, A6, A7, A8 and A9 go through a decoding selection board card. Each pulse goes through active filtering and photoelectric isolation to remove the signal interference of burrs and the like. A pulse signal goes through the double narrow pulse latch circuit of the CPLD, the software carries out automatic reset in latching, the counting or timing working mode of each channel of 8253 is set by the software, and a corresponding function is realized. Each channel can set an event to interrupt, and an interruption service program reads each channel state, responds to a corresponding interruption, executes a preset action and returns to a break point to continue