CN202120109U

CN202120109U - CAN (Controller Area Network) bus control device of radiotherapy equipment

Info

Publication number: CN202120109U
Application number: CN2011202139773U
Authority: CN
Inventors: 王权
Original assignee: Shinva Medical Instrument Co Ltd
Current assignee: Shinva Medical Instrument Co Ltd
Priority date: 2011-06-23
Filing date: 2011-06-23
Publication date: 2012-01-18
Anticipated expiration: 2021-06-23

Abstract

The utility model relates to a CAN (Controller Area Network) bus control device of radiotherapy equipment, belonging to the field of radiotherapy equipment. The device comprises an industrial personal computer which is connected with a CAN bus interface card through a PCI (Peripheral Component Interconnect) expansion slot and connected with a plurality of lower computers through the CAN bus interface card; the input end of each lower computer is connected with the output end of a sensor; and the output end of each lower computer is connected with the input end of the CAN bus interface card and a motor control circuit. The CAN bus control device of radiotherapy equipment has low cost, convenient for installation and debugging, reliable performance and strong system anti-jamming capability, is capable of meeting the control requirements of a plurality of radiotherapy apparatuses and can be widely applied to central control machines and distributed control systems with certain distances from onsite equipment.

Description

The CAN bus control device of radiotherapy equipment

Technical field

The utility model relates to a kind of CAN bus control device of radiotherapy equipment, belongs to the radiotherapy equipment field.

Background technology

For radiotherapy equipment; Because there is the existence of radioactive source radiation at the equipment work scene; Operating personnel must realize in the far-end safety zone the collection of field data and the control of equipment except that accomplishing necessary pendulum position work as far as possible, to avoid receiving the radioactivity injury.Just because of have this singularity, requiring will have certain distance between PC and controlling object.The direct-connected method of cable is all adopted in message exchange between each control assembly of conventional radiotherapy, and in single system, this method can also be accepted, but in complication system, and on-the-spot signal wire is too much, can cause installing loaded down with trivial details, inconvenient debugging.Simultaneously, in traditional control system, if adopt in the RS232 communication mode; Interface uses non-equilibrium transmitter and receiver, and two transmission directions have only a signal ground, so electric property is not good; Be easy to generate interference, its transmission range can not satisfy Long-distance Control in 15m.Along with the fast development of radiotherapy equipment, traditional control system more and more can not be satisfied the demand.

The utility model content

According to above deficiency of the prior art; The utility model technical matters to be solved is: provide a kind of CAN bus control device of radiotherapy equipment to come control system; Under the situation of accomplishing radiotherapy control requirement; Simplify field wiring to greatest extent, economical with materials, the antijamming capability of raising system.

The utility model solves the technical scheme that its technical matters adopted: a kind of CAN bus control device of radiotherapy equipment; Comprise industrial computer; Industrial computer connects the CAN bus interface card through the PCI expansion slot; Through a plurality of slave computers of CAN EBI card connection, the output terminal of the sensor input connection of each slave computer, the output terminal of slave computer connects the input end and the circuit for controlling motor of CAN bus interface card.

Described slave computer is singlechip controller or FPGA, can send and receive the CAN bus data through it.

Described industrial computer is mainly sampled and the sending of steering order to the information of a plurality of Distributed C AN bus control devices.

Described CAN bus interface card mainly is the interface card that carries out CAN communication, can convert the Transistor-Transistor Logic level digital quantity at scene into digital quantity that industrial computer can be discerned through it, and then industrial computer can obtain current information.Simultaneously,, can send, be converted into CAN bus distribution unit circuit acceptable Transistor-Transistor Logic level signal to the instruction of the digital quantity of industrial computer steering order through the CAN bus interface card.

Described sensor can be scrambler, potentiometer, optoelectronic switch and travel switch etc., according to concrete operating position corresponding sensor is set, and each slave computer can connect a plurality of sensors.

Described circuit for controlling motor is can be photoelectrical coupler, motor driver and relay etc., according to concrete operating position corresponding circuit for controlling motor is set.The movement instruction that circuit for controlling motor mainly transmits host computer, go out bundle and stop Shu Zhiling and decode and then control relevant circuit working.

Principle of work and process:

In the CAN bus control device of the radiotherapy equipment that the utility model provides, the industrial computer machine is a main frame, and being distributed in each on-the-spot slave computer with CAN interface is slave, and the CAN communication mode of two-wire system is adopted in the communication between them.Through utilizing a plurality of sensors to come different information is sampled; Industrial computer is in time made judgement, and startup or termination are moved or controlled out the Shu Yuting bundle, and this control device based on the CAN bus is controlled under the situation of requirement in completion radiotherapy; Simplify field wiring to greatest extent; Economical with materials, the antijamming capability of raising system has reduced the probability that hazard event takes place.

In traditional control system, if require PC that the 30 way switch amount signals of " object 1 " are controlled, PC is embedded in the formula integrated circuit board and must be connected through the cable more than 30 cores with control module, and then " object 1 " controlled.And adopt the improved control system of the utility model, (CAN+ CAN-) carries out communication with slave computer #1 to get final product, and slave computer #1 is installed in the position near " object 1 " only to need two signal wires that PC comes out through the CAN bus interface card.Like this, with original system contrast, with the Communication Control of " object 1 " in can save 30 lines.In like manner, the distribution control module is many more, and cost is practiced thrift more.After adopting improved control system; Because adopting, it has balance transmission and differential received communication mode; Therefore have the ability that suppresses common mode interference, add that transceiver has high sensitivity, can detect the low voltage that reaches 200mv; So transmission signals more than km, has improved the antijamming capability of system.

Set under the situation of consistent communications protocol at PC and each slave computer,, can carry out Long-distance Control to each slave computer through PC according to table 1.

Table 1 slave computer logical address table

The position	Value	Function
			1	?$A0	Initial code
2	?$00?to$1F	Address code
			3	?Data?byte?1	Data bit 1
4	?Data?byte?2	Data bit 2
			5	?Data?byte?3	Data bit 3
6	?Data?byte?4	Data bit 4
			7	?$AF	Stop code
8	?$00-$FF	Check code

Initial code is Gu Dingzhi $A0, and address code is the logical address of each slave computer, can be set 32 on-the-spot slave computers of the maximum may command of PC by the DIP switch on the slave computer.

Data bit 1 to 4 can be distinguished each action of corresponding controlled device like table 2:

Table 2 controlled device action schedule

Stop code is Gu Dingzhi $AF, and check code is the XOR value (XOR) of Byte2 to this 5 number of Byte6.Address code so Di Zhima $00 representes first equipment, in like manner, can be known the address code of miscellaneous equipment from 0 volume.

The beneficial effect that the utility model had is: a kind of CAN bus control device of radiotherapy equipment; Cost is low; Installation and Debugging are convenient, dependable performance, and system's antijamming capability is strong; Can satisfy the control requirement of multiple theratron, can be widely used in center control machine and field apparatus has in the dcs of certain distance.

Description of drawings

Fig. 1 is the utility model hardware principle block scheme.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the utility model is done and to further describe:

As shown in Figure 1; A kind of CAN bus control device of radiotherapy equipment; Comprise industrial computer, industrial computer connects the CAN bus interface card through the PCI expansion slot, through a plurality of slave computers of CAN EBI card connection; The output terminal of the sensor input connection of each slave computer, the output terminal of slave computer connects the input end and the circuit for controlling motor of CAN bus interface card.

Industrial computer is mainly sampled and the sending of steering order to the information of a plurality of Distributed C AN bus control devices.

The CAN bus interface card mainly is the interface card that carries out CAN communication, can convert the Transistor-Transistor Logic level digital quantity at scene into digital quantity that industrial computer can be discerned through it, and then industrial computer can obtain current information.Simultaneously,, can send, be converted into CAN bus distribution unit circuit acceptable Transistor-Transistor Logic level signal to the instruction of the digital quantity of industrial computer steering order through the CAN bus interface card.

Slave computer can be a single-chip microcomputer, also can be FPGA, can send and receive the CAN bus data through it.

Sensor can be scrambler, potentiometer, optoelectronic switch and travel switch etc., according to concrete operating position corresponding sensor is set, and each slave computer can connect a plurality of sensors.

Circuit for controlling motor is can be photoelectrical coupler, motor driver and relay etc., according to concrete operating position corresponding circuit for controlling motor is set.The movement instruction that circuit for controlling motor mainly transmits host computer, go out bundle and stop Shu Zhiling and decode and then control relevant circuit working.

In the CAN bus control device of the utility model radiotherapy equipment, the industrial computer machine is a main frame, and being distributed in each on-the-spot slave computer with CAN interface is slave, and the CAN communication mode of two-wire system is adopted in the communication between them.Through utilizing a plurality of sensors to come different information is sampled; Industrial computer is in time made judgement, and startup or termination are moved or controlled out the Shu Yuting bundle, and this control device based on the CAN bus is controlled under the situation of requirement in completion radiotherapy; Simplify field wiring to greatest extent; Economical with materials, the antijamming capability of raising system has reduced the probability that hazard event takes place.

The CAN bus control device of the utility model radiotherapy equipment, cost is low, and Installation and Debugging are convenient; Dependable performance; System's antijamming capability is strong, can satisfy the control requirement of multiple theratron, and can be widely used in center control machine and field apparatus has in the dcs of certain distance.

Claims

1. the CAN bus control device of a radiotherapy equipment; Comprise industrial computer; Industrial computer connects the CAN bus interface card through the PCI expansion slot; It is characterized in that: through a plurality of slave computers of CAN EBI card connection, the output terminal of the sensor input connection of each slave computer, the output terminal of slave computer connects the input end and the circuit for controlling motor of CAN bus interface card.

2. the CAN bus control device of radiotherapy equipment according to claim 1, it is characterized in that: described slave computer is singlechip controller or FPGA.