Intelligent transmitter and safety device based on monostable circuit
A technology of a safety protection device and an intelligent transmitter, which is applied in the direction of using an electric/magnetic device to transmit a sensing component, etc., can solve the problems of accurately detecting the failure of the microprocessor, unable to detect the failure of the microprocessor in a timely and accurate manner, etc. To achieve the effect of preventing false chain reactions
Active Publication Date: 2010-02-03
ZHEJIANG SUPCON INSTR
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Problems solved by technology
[0008] The purpose of the present invention is to provide an intelligent transmitter to solve the problem that the existing intelligent transmitter cannot detect the failure of the microprocessor in a timely and accurate manner
[0009] Another object of the present invention is to provide a safety protection device based on a monostable circuit to solve the problem that the existing intelligent transmitter cannot detect the failure of the microprocessor in a timely and accurate manner
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[0027] The principle of the present invention is: the present invention adds a safety protection device based on the monostable circuit in the existing transmitter, and monitors the work of the microprocessor of the transmitter through the safety protection device based on the monostable circuit state. If it is found that the microprocessor is in a failure state, the transmitter will immediately output a preset current value, so as to detect system failures in time, thereby performing fault maintenance and preventing system error chain reactions.
[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0029] See image 3 , which is a structural diagram of an intelligent transmitter according to an embodiment of the present invention. This intelligent transmitter includes a sensor 303, a V / I conversion circuit 309, a microprocessor 307 and a safety protection device 301 based on a monostable circuit. The safety protecti...
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The invention provides an intelligent converter and a safety protection device based on a monostable circuit, wherein, the converter is used for converting a non-electric physical quantity to an analog-quantity electric signal and comprises a sensor, a V / I switching circuit, a micro processor and the safety protection device based on the monostable circuit. One end of the safety protection devicebased on the monostable circuit is connected with the micro processor of the intelligent converter, the other end is connected with the V / I switching circuit; the safety protection device is used fordetermining whether the work state of the micro processor is ineffective by testing whether the micro processor sends out a pulse signal within a preset period; and if the micro processor is ineffective, the intelligent converter outputs a preset current value. The converter and the device of the invention can monitor the work state of the micro processor, thereby effectively avoiding the occurrence of systematic errors.
Description
technical field [0001] The invention relates to the technical field of intelligent transmitters, in particular to a safety protection device based on a monostable circuit and an intelligent transmitter using the safety protection device. Background technique [0002] It is generally necessary to measure various non-electrical physical quantities in industry, such as temperature, pressure, speed, angle, etc. These non-electrical physical quantities need to be converted into analog electrical signals before they can be transmitted to the control room or display equipment hundreds of meters away. A transmitter is a device used to convert physical quantities into electrical signals. [0003] At present, the mainstream transmitter is a 4-20mA two-wire intelligent transmitter. The two-wire transmitter means that only two wires are used to connect the field transmitter and the control room instrument. These two wires are both power wires and signal wires. In order to realize the ...
Claims
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IPC IPC(8): G01D5/14
Inventor 丁云李堂忠朱丽萍
Owner ZHEJIANG SUPCON INSTR