Communication RS232 signal isolation explosion-proof safety barrier
A technology of isolating explosion-proof and safety barriers, which is applied in the direction of logic circuits using photoelectric equipment, logic circuit connection/interface layout, logic circuits using specific components, etc., can solve problems such as inability to use, and achieve enhanced anti-interference and reliable communication Guaranteed effect
Pending Publication Date: 2020-12-04
苏州倍加福电气自动化有限公司
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Problems solved by technology
However, ordinary RS232 data lines cannot be used directly in places with explosive hazards, such as coal, petrochemical, natural gas, etc. When RS232 communication is carried out in these fields, there will be a danger of the line igniting and igniting explosive combustibles
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Embodiment Construction
[0011] exist figure 1 In the shown embodiment, an intrinsically safe end RS232 conversion chip (U1), a non-intrinsically safe end RS232 conversion chip (U2), an input terminal (U3A), an output terminal (U3C), an emitting optocoupler (U4), and a receiving optical coupler are provided. Coupler (U5), power status indicator (D17), sending status indicator (D2), receiving status indicator (D1).
[0012] exist figure 2 In the shown embodiment, the circuit principle of the present invention is marked as follows: the signal is input to the explosion-proof processing circuit from the dangerous side 232 bus, after the signal is subjected to explosion-proof processing, it is input to the 232 level to TTL level circuit, and then isolated by the optocoupler , the safe signal is input to the TTL level and converted to 232 level, and finally the safe signal is output by the 232 bus on the safe side.
[0013] A communication RS232 signal isolation explosion-proof safety barrier implementin...
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A communication RS232 signal isolation explosion-proof safety barrier is provided. RS232 bus communication is performed between a host controller and a field sensor and between the host controller andan actuator, detection and control of field data acquisition or downlink control instructions are carried out, data transmission, automatic control and remote operation are carried out, explosion-proof processing is performed at the same time to limit energy on a data line during RS232 equipment communication, so that the energy is insufficient to ignite the explosive mixture. Two devices are electrically isolated at the same time, so that the anti-interference performance of an industrial control network is enhanced. According to the invention, any control detection device with an RS232 interface can carry out data transmission between a safety zone and a danger zone, and an electrical isolation function can be realized. An RS232 interface of an intrinsic safety end can be provided for equipment in a dangerous area, and production operation safety in a flammable and combustible environment is protected. The safety barrier is isolated from a dangerous area, energy on a transmission line is limited within a safe range, and the safety barrier is very convenient and practical.
Description
[0001] Technical field [0002] The invention relates to a signal isolation safety device, in particular to a RS232 bus communication between a host controller and field sensors and actuators, to carry out field data collection or detection and control of downlink control commands, to carry out data transmission, Automatic control and remote operation, a communication RS232 signal isolation explosion-proof safety barrier capable of data isolation transmission and explosion-proof processing. Background technique [0003] With the continuous improvement of industrial automation, the application of automatic control is getting higher and higher, and the communication between field sensors and controllers is essential. RS232 is one of the communication interfaces on the computer. It is an asynchronous transmission standard interface formulated by the Electronics Industry Association. It has been widely used in computer communication interfaces. However, ordinary RS232 data lines ...
Claims
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Login to View More IPC IPC(8): H03K19/14H03K19/0175
CPCH03K19/0175H03K19/14
Inventor李威周虎侯荣奇
Owner苏州倍加福电气自动化有限公司