CN201514564U

CN201514564U - Flow calibration PLC automatic control system

Info

Publication number: CN201514564U
Application number: CN2009202360862U
Authority: CN
Inventors: 陈柏志
Original assignee: EMA ELECTRONICS Ltd
Current assignee: EMA ELECTRONICS Ltd
Priority date: 2009-09-23
Filing date: 2009-09-23
Publication date: 2010-06-23
Anticipated expiration: 2019-09-23

Abstract

The utility model relates to a flow calibration PLC automatic control system, which comprises a base plate, a power supply module, a CPU module, a digital input module, a digital output module, an analog quantity input module and an analog quantity output module, wherein the power supply module, the CPU module, the digital input module, the digital output module, the analog quantity input module and the analog quantity output module are installed on the base plate and are connected with each other through the base plate, the power supply module supplies power to the CPU module, a digital quantity input module, a digital quantity output module, the analog quantity input module and the analog quantity output module, the output of the digital input module and the output of the analog input module are connected with the input of the CPU, and the output of the CPU is connected with the input of the digital output module and the input of the analog output module. The utility model has the advantages that the pipeline flow can be automatically adjusted, the adjusting speed is fast and the precision is high; the tedious operation is avoided and the cost is saved; and the automatic mode and the manual mode can be freely shifted to satisfy the need of temporary field tests.

Description

A kind of flow calibration PLC automatic control system

Technical field

The utility model relates to PLC control technology field, is specially a kind of flow calibration PLC automatic control system.

Background technology

Traditional not high or complete manual operation of flow calibration plant automation degree, like this operating personnel operate loaded down with trivial details, inefficiency, labour intensity is big, and test result tested person personnel's subjective factor influence is bigger; Loaded down with trivial details operating process also goes wrong easily.

Summary of the invention

Problem to be solved in the utility model is: existing flow calibration plant automation degree is not high, complex operation, and error appears in inefficiency easily.

The technical solution of the utility model is: a kind of flow calibration PLC automatic control system, comprise substrate, power module, the CPU module, digital input module, the numeral output module, the analog quantity load module, analog output module, described power module, the CPU module, digital input module, the numeral output module, the analog quantity load module, analog output module all is installed on the substrate, and by substrate realization connection to each other, power module is given the CPU module, digital quantity input module, the digital quantity output module, the analog quantity load module, the analog output module power supply, the output of digital input module and analog input module is connected the input of CPU module, and the output of CPU module connects the input of digital output module and analog output module.

Digital quantity input module is connected with field apparatus by the transfer relay with the digital quantity output module, and the analog quantity load module directly is connected with field apparatus with analog output module.

The utility model with the CPU module as control core, receive switch or the analog signals that field apparatus returns by digital input module and analog input module, after the CPU computing, control signal is outputed to equipment such as on-the-spot switch valve and operation valve by digital output module and analog output module.

The utility model can be regulated pipeline flow automatically according to flow setting value, and governing speed is fast, precision is high; Can test the flowmeter of multiple dimensions, avoid being every kind of size pipe arrangement loaded down with trivial details separately all, and provided cost savings; Can arbitrarily switch automatically and under the manual mode, to satisfy the needs of on-the-spot interim test, operating personnel can operate according to actual conditions under manual mode, under automatic mode, can finish the calibration process of flowmeter automatically, after the tester is mounted to tested product on the pipeline, can press automatic demarcation button, system can at first regulate flow in order to analog value, read the signal of test product then and with the contrast of this signal and standard value, thereby obtain testing net result.

Description of drawings

Fig. 1 is the theory diagram of flow calibration PLC automatic control system.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As Fig. 1, the utility model comprises substrate, power module, the CPU module, digital input module, the numeral output module, the analog quantity load module, analog output module, described power module, the CPU module, digital input module, the numeral output module, the analog quantity load module, analog output module all is installed on the substrate, and by substrate realization connection to each other, power module is given the CPU module, digital quantity input module, the digital quantity output module, the analog quantity load module, the analog output module power supply, the output of digital input module and analog input module is connected the input of CPU module, and the output of CPU module connects the input of digital output module and analog output module.Digital quantity input module is connected with field apparatus by the transfer relay with the digital quantity output module, and the analog quantity load module directly is connected with field apparatus with analog output module.

Substrate plays the effect of fixing each module, supply power, transmission signal; Field apparatus comprises on-the-spot near switch, switch valve, flowmeter, operation valve, thermometer, pressure gauge etc.

The utility model principle of work is as follows:

Power module: with the 220VAC power source conversion is direct supply, is CPU module, digital quantity input module, digital quantity output module, analog quantity load module, analog output module power supply by substrate.

Digital quantity input module: be responsible for the position signalling of reception on-the-spot control knob signal, on-the-spot level switch alerting signal and switch valve etc.

Digital quantity output module: be responsible for to export control signal and deliver to on-the-spot switch valve, contactor, control its action.

Transfer relay: the switching signal of field apparatus and the signal of digital quantity input/output module are carried out electrical isolation.

The analog quantity load module: this module receives the 4-20mA analog signals of in-site modeling amount equipment such as flowmeter, pressure gauge, thermometer, and is converted to digital quantity and is delivered to the CPU module.

Analog output module: the digital quantity signal that this module is sent the CPU module changes aperture size, the frequency converter frequency of analog signals control field control valve into.

The utility model can be selected manually and automatic mode,

When being chosen as manual mode, operating personnel can directly control the open and close of on-the-spot switch valve, and the aperture of operation valve and frequency converter frequency are not influenced by logical program control.

When being chosen as automatic mode, the PLC automatic control system can be controlled on-the-spot all devices flow is automatically adjusted according to on-site signal that collects and the program of self.

Claims

1. flow calibration PLC automatic control system, it is characterized in that comprising substrate, power module, the CPU module, digital input module, the numeral output module, the analog quantity load module, analog output module, described power module, the CPU module, digital input module, the numeral output module, the analog quantity load module, analog output module all is installed on the substrate, and by substrate realization connection to each other, power module is given the CPU module, digital quantity input module, the digital quantity output module, the analog quantity load module, the analog output module power supply, the output of digital input module and analog input module is connected the input of CPU module, and the output of CPU module connects the input of digital output module and analog output module.

2. a kind of flow calibration PLC automatic control system according to claim 1, it is characterized in that digital quantity input module is connected with field apparatus by the transfer relay with the digital quantity output module, the analog quantity load module directly is connected with field apparatus with analog output module.