X-ray machine communication design technology based on Delta EX PLC

1 Introduction

The high frequency high voltage generator is the core unit of the X-ray machine. The medical X-ray machine high-frequency high-voltage generator is powered by three-phase power frequency. The three-phase power frequency power supply is passed through bridge rectification, high frequency inverter, and transformer boosting to obtain a 150KV 30KHz high frequency high voltage. The high frequency high voltage is rectified by the second (high voltage) to become the DC high voltage excitation power source of the X-ray tube. X-rays of different intensities are generated for medical examinations such as fluoroscopy and filming by different excitation voltage and current setting values. The stable high-voltage constant-current power supply is an important basis for ensuring the quality of the perspective film, especially the X-ray biological radiation. With the development of electronic circuits, the power supply of X-ray machines to generate X-rays has also evolved from the original power frequency circuit to the current control of inverter circuits through digital technology. The patient test bed is the motion control unit of the X-ray machine. In order to avoid and reduce the movement of the patient detection process, the X-ray machine is equipped with an X-ray machine follow-up control detection bed. The test bed is combined with the X-ray machine to achieve accurate imaging detection of specific parts of the patient.

Based on the introduction of the new X-ray machine integrated solution based on PLC automation technology, this paper focuses on the communication design technology of Delta EX series PLC system.

2, technical solutions

The project selects Delta DVP-20EX as the PLC host, and exchanges data through RS485 communication interface and X-ray machine high frequency high voltage generator. The PLC input point is used to control the control of various mechanisms such as fluoroscopic bed lifting and rotation, and the color touch screen and PLC are connected as HMI input and display data, thus demonstrating a brand new X-ray machine circuit control system. The key point is to use the communication function of PLC and the use of RS command to realize the data exchange between PLC and X-ray machine high-frequency high-voltage generator, so that the use of X-ray machine high-frequency high-voltage generator is more colorful.

PLC-based X-ray machine automation system control principle: translation instructions; stored in registers; RS command transmission, reception; judgment of receiving instructions; output signals.

Since the X-ray machine high frequency generation system command is an ASCII character command. One instruction starts with a newline character and the carriage return ends. An instruction completely contains newline characters, instruction mnemonics, parameters, and carriage returns. The accused machine receives a valid command and must answer it after execution. For example: LF KVN75 CR means to set the tube voltage to 75KV, and the controlled machine answers LF KVN75 CR after receiving this command to indicate that the command is received.

3, system communication and RS command application

Using the RS serial data transmission instruction in Delta PLC, the compiled instructions are sent out from the PLC one by one according to the needs. Each time the PLC sends an instruction, the generator answers an instruction. There are two main types of these instructions: one is a control instruction without data, for example: LF PI CR (turning on the system power supply), feeding back the same instruction; one is an instruction containing data for setting data, for example : LF KVN75 CR sets the tube voltage to 75KV and feeds back the same command LF KVN75 CR. These instructions need to be ASCII code. There are ready-made SACII codes for line feeds and carriage returns. Instruction mnemonics and values ​​need to be translated into ASCII codes one by one. These statements are passed through RS according to the instruction requirements. The function is transmitted to the X-ray machine high-frequency high-voltage generator, and the X-ray machine high-frequency high-voltage generator will work according to these instructions. The workflow is:

3.1 Enter a fixed communication command

The flow of inputting a fixed communication command is shown in Figure 1.

Figure 1 Enter a fixed communication command

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