Timer device comprising advanced reduced instruction set computer machine (ARM) and field programmable gate array (FPGA) and implementation method thereof

Abstract

The invention relates to a timer device comprising an advanced reduced instruction set computer machine (ARM) and a field programmable gate array (FPGA), which is characterized by taking an embedded ARM microprocessor as a control module and the FPGA as a timing processing module, and comprises an ARM control module, a memory module, an FPGA timer module, a two-port random access memory (RAM) module and a power module, wherein the ARM control module is respectively connected with the memory module and the two-port RAM module; the FPGA timer module is connected with the two-port RAM module; when a large-scale time control program or a programmable controller user program is executed by the ARM control module, under the condition that a timer meets the running requirement, running state information is transmitted to the two-port RAM module by the ARM control module; under the condition that the timer does not meet the running requirement, running stopping information is transmitted tothe two-port RAM module; and when soft contact storage unit information is read by the program, contact state information is read from the two-port RAM module by the ARM control module. By adopting the device and the method for realizing the timer thereof, the timing precision is high, and the execution time of the PLC user program is not occupied.

Description

technical field [0001] The present invention relates to a timer device and a timing method, in particular to a timer device for a large-scale time control device or a programmable logic controller (PLC) and an implementation method thereof. Background technique [0002] In the application system of large-scale time control or programmable logic controller (PLC), a large number of timers will be used, and there are usually five ways to realize them: the first and second ways are the application of a timer in the microprocessor. The timing time is used as the reference time, and the timing parameters of each timer are stored in a storage unit, and the timer interrupt method is used for programming. There are two main programming methods. The first method is to program the timer judgment in the reference timer interrupt service program. Processing program, the reference timer regularly sends interrupt signals according to the reference time. In the reference timer interrupt ser...

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Problems solved by technology

[0004] 2. Applying the timing interrupt method of the reference timer, the CPU responds and exits the reference timer interrupt service program to occupy the CPU running time; although the query method of the fourth method does not need to respond and exit the interrupt operation, the system program needs to query and exit once. Judgment once; the smaller the timing reference time, such as 1ms, the more timers in the timer system, the longer the CPU will be occupied, which will have a serious impact on the execution speed of other program modules, and the timing accuracy is not high;

[0006] The fifth method is to use non-programmable hardware timing, and each timer is realized by an independent hardware circuit; in this way to realize the timing function, the more timers are required, the larger the circuit scale and the maintenance workload is.

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