256 results about "Programmable Interrupt Controller" patented technology

A dimmer circuit applicable for LED device and control method thereof is disclosed in the embodiments of the present invention. The dimmer circuit is applicable for controlling at least a LED device. The dimmer circuit includes a rectifier, a bleeder, a phase angle detect circuit, a constant current circuit and a programmable micro controller. The phase angle detect circuit couples to the programmable micro controller. The constant current circuit couples to the LED device The programmable micro controller generates a PWM signal according to the output signal of the phase angle detect circuit to adjust current of the constant current circuit.

Safety level error detection comparable to that provided by redundant wired safety relays is obtained on a backplane of a programmable logic controller or the like by a combination of error detection methods that in sum provide the requisite level of error detection required without necessitating a particular hardware requirement or duplicative message transmissions.

Systems, structures and methods for generating a test clock for scan chains to implement scan-based testing of electronic circuits are disclosed. In one embodiment, a test clock control structure includes a programmable test clock controller. The programmable test clock controller includes a test clock generator for generating a configurable test clock. It also includes a scan layer interface to drive a scan chain portion with the configurable test clock, and a control layer interface configured to access control information for controlling the scan chain portion. In another embodiment, a method effectuates scan-based testing of circuits. The method includes performing at least one intra-domain test and performing at least one inter-domain test using implementing dynamic fault detection test patterns, which can include last-shift-launch test patterns and broadside test patterns.

An improved data modem (IDM) and method includes a communication processor module, a mass storage module, a power converter module, and one or more DSP modules. The communication processor module utilizes commercial off-the-shelf components as well as programmable logic devices (EPLD), which are programmed to provide a watchdog timer, programmable interrupt controller, flash page addressing, ISA bus decoder and controller, and various circuits and logic.

An input/output module for use in an industrial control system and connectable to a programmable logic controller (PLC), the input/output module having an interface configured for an electrical connection to the PLC, a plurality of pins configured for connection to one of a plurality of peripherals, an application specific integrated circuit (ASIC) disposed in the I/O module and electrically coupled to a system controller, the ASIC having a plurality of connection paths, each path being configured for a function, and a switch block configured to reassign a signal from a first connection path of the plurality of connection paths to a second connection path of the plurality of connection paths.

A method and apparatus provides programmable control of built-in self test. A programmable controller allows software selectively to run BIST on different ports of the complex circuit and examine the results. The programmable BIST controller is implemented to execute selected BIST operations, wherein software may choose to either enable or disable running of a particular BIST operation.

The invention discloses a system and a method for automatically testing an analog module with a settable input/output (I/O) channel in a programmable logic controller (PLC). The system comprises an upper control computer, a programmable direct current signal source, a digital multimeter, a channel and voltage/current mode switching control plate and a communication interface, wherein the upper control computer sets a testing parameter, issues an instruction to realize output or measurement, receives a test result and makes judgment according to the result; the programmable direct current signal source receives the instruction and the parameter to set the output as a voltage or current mode, sets and outputs a voltage/current signal to an input channel; the digital multimeter receives the instruction to set the measurement as the voltage or current mode, measures the voltage or current signal output by an output channel and returns a measured value to a computer; the channel and voltage/current mode switching control plate switches a test channel and a voltage/current connection mode according to the instruction; and the communication interface transmits the parameter, the instruction and the test result between each device and a tested model. A computer reads the conversion value of the voltage or current measured value of the input channel through the communication interface or transmits a set numerical value to the output channel to convert the set numerical value into a voltage or a current.

In accordance with an aspect of the present invention there is provided a system for sampling air at multiple locations in a controlled environment. The system includes one or more air sampling devices configured to monitor and test a volume of air within a controlled environment. A control center including a programmable logic controller (PLC) is configured to monitor and control the one or more air sampling devices. One or more touch panel displays are connected to the control center and provide a human-computer interface between the control center and users.

An advanced programmable interrupt controller (APIC) identification (ID) configuration method is applied to a multiprocessor computer system. The method assigns a postponed ID to each CPU's APIC IDs respectively during the initialization. Plural reserved IDs are assigned to the I/O APICs. A multiprocessor configuration table in a basic input output system (BIOS) will be updated with renewed ID configuration, to avoid an ID conflict when processing the interrupt request from the peripheral devices and raise the stability of the multiprocessor computer system.

The value of fixed cycle time is adjusted to an optimum value in a short period of time. In a second operational mode (MON) of a PLC, a series of a plurality of system processes are repeatedly performed with a change to a user program in a peripheral service process being allowed. A change to fixed cycle time to be compared with actual cycle time is prohibited in a first operational mode (RUN) but is allowed in the second operational mode (MON) and a non-operational mode (PRG).

The invention relates to a method for realizing integration of a polarizing beam splitter and a slow light device by using a bend waveguide, belonging to the technical field of micro optical integration. In the invention, the polarizing beam splitter and a coupled-cavity waveguide slow light device are integrated on the same flat plate by using the bend waveguide with two turn angles of 60 degrees for the first time. In the invention, a flat-plate structure based on a two-dimensional photonic crystal is designed; and the structure of the device is designed in such a way that each module of an integrated device works at the same frequency, thus high efficient coupling between the polarizing beam splitter and the bend waveguide as well as the slow light device is realized. The basic structure of the flat-plate structure is a photonic crystal GaAlAs (Gallium-Aluminum-Arsenic) flat-plate structure based on an air-vent triangular lattice, which is much closer to a traditional widely-applied photonic crystal manufacturing technology based on SOI (Silicon-On-Insulator) and has the characteristic of very good realizability. In addition, the polarizing beam splitter and the coupled-cavity waveguide slow light device are connected with each other by using the bend waveguide in the design of the scheme so as to provide a new method for realizing the micro PIC (Programmable Interrupt Controller).

The invention belongs to the technical field of automatic control and electronics, and discloses a programmable logic controller (PLC) experimental system, which comprises three parts of a PC (personal computer) (1), a signal conditioning board (2), a PLC controller (3), wherein the signal conditioning board comprises a mainboard (21), a digital quantity interface board (22) and an analog quantity interface board (23); the PLC controller comprises a central processing unit (CPU) (31), a digital input/output data input (DI)/data output (DO) (32) and an analog input/output (AI/AO) (33). The PC is communicated with the signal conditioning board through an Ethernet; the PC is communicated with the PLC controller through a multi-point interface (MPI) adapter; and the signal conditioning board is communicated with the input (I)/output (O) port of the PLC. The software resource of the PC is substituted for a controlled object in a PLC control system, the lack of the number and the types of the controlled object of a real object in the experiment is made up, and the price of the experimental system is maintained low.

A multiprocessor device is provided that includes a plurality of processors in which each processor of the plurality of processors includes an interrupt controller, and a symmetric interrupt crossbar having a plurality of interrupt inputs in which each interrupt input that is not reserved is coupled to a respective interrupt output of an interrupt source of a plurality of interrupt sources, and a plurality of interrupt outputs in which each interrupt output is coupled to a respective interrupt input of an interrupt controller of one of the plurality of processors, in which the symmetric interrupt crossbar is programmable to map an interrupt signal from any interrupt source of the plurality of interrupt sources coupled to the symmetric interrupt crossbar to any interrupt input of any interrupt controller coupled to the symmetric interrupt crossbar.

The invention provides an information publish device of production line equipment controlled by a programmable logic controller (PLC) based on a hypertext markup language (HTML). The device provided by the invention is characterized in that a central processing unit (CPU) is adopted as control part; the CPU is connected with a memorizer; the CPU is connected with a computer network interface; the CPU is connected with the physical interface of the PLC for the production line equipment; the memorizer comprises a network interface zone and a user zone; the network interface zone comprises a communication protocol and a memory mapping list, a transmission control protocol/internet protocol (TCP/IP) module and system software, wherein the communication protocol and the memory mapping list access to the PLC of the production line equipment; and the user zone comprises an HTML code module, an access authority list and a PLC communication parameter module. An HTML webpage is adopted to store a man-machine interaction interface containing PLC data, so that a computer in networks can perform access so as to realize human-machine interaction by means of webpage operations. Based on the communication protocol of the PLC and the memory data structure of the PLC, the system software calls subfunctions in accordance with the memory mapping list so as to obtain or modify the memory data of the PLC, and results are stored in the mapping list. The corresponding data in the memory mapping list is embedded into a webpage which is complied by means of HTML codes so as to form an integrated human-machine interaction interface.

A control interruption method for application program interception and monitoring systems, comprises: A hardware interruption request number of a system control interruption that is taken by an application program from a Basic Input and Output System (BIOS); an interruption vector number that corresponds with the hardware interruption request number, and acquired by the application program in a corresponding way according to that the interruption mode is a programmable interruption controller mode, or an advanced programmable interruption controller mode; a plurality of interruption service program examples that modify interruption entrance in an interruption description symbol list in a Central Process Unit (CPU) corresponds with interruption vector number, into pointing to application programs; as well as a plurality of interruption events corresponding with initialization information that is pre-established according to an interruption and interception list in the application program, and initialization hardware interruption request number.

The invention provides a self-checking method for a digital quantity output device of a programmable logic controller, and the method comprises the following steps: collecting the digital quantity output when a driving switching tube is in a turn-on state/off state in the digital quantity output device according to a selected signal transmitted by an I/O (input/output) module processing unit in the digital quantity output device; carrying out a differential operation to the collected digital quantity output and the supply voltage of the driving switching tube to obtain a simulation signal forrepresenting the turn-on voltage drop/electricity leakage judgment parameter of the driving switching tube; converting the simulation signal into a digital signal; and comparing the digital signal with the turn-on voltage drop parameter value of the driving switching tube/the voltage value which is the same to the power supply of the driving switching tube, thereby judging whether the driving switching tube is aged or not. Correspondingly, the embodiment of the invention also provides a digital quantity output device of a programmable logic controller. According to the digital quantity outputdevice provided by the invention, the recession conditions of the driving switching tube can be known in advance, and users can perform equipment maintenance before cataleptic failures.