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Key words: photoelectric counting; counting; application; PLC; pharmaceutical bottle optoelectronics as a major part of automatic control in pharmaceutical applications is very common, how to ensure the reliable operation of the system and meet pharmaceutical GMP is particularly concerned. This article tries to give a brief introduction to the application and operation of photoelectric counting technology in pharmaceutical factories (produced by medicine bottles as medicine packaging materials).
1The problem counter is often used to count the production of the medicine bottle, but the counting error often occurs. Especially when this quantity is recorded in the batch record, once the error occurs, the whole batch of products will be biased or misunderstood. Judgment, causing unnecessary manpower and material waste, therefore, the zero error of the count must be guaranteed.
The purpose of this paper is to use the counter on the bottle packaging line. The process is to transfer the vial to another process from the end of the lamp inspection to the labeling process, and use the photoelectric counting statistics during the transfer process. The number of vials.
2 Counting design requirements (1) The counter must be designed to meet production needs without affecting production and can withstand verification. It should simulate the performance of the counter in various states in advance.
(2) The design count function should be a falling edge trigger, which ensures that each vial that passes through the optoelectronics has been counted.
(3) The counter should take into account abnormal phenomena such as bottle retreat and bottle blocking during operation.
(4) The counter should be capable of performing the counting function of all the vials used on the line. Since the height of the vials is inconsistent, the height of the photoelectric detector needs to be easily adjusted.
3 counting hardware configuration counting hardware mainly includes photoelectric and PLC, counter, frequency converter, the hardware configuration of the system is shown in Figure 1. The main considerations are as follows:
(1) Choice of optoelectronics. There are many models of optoelectronic products, and the application is also extensive. There are many suppliers in China who are engaged in foreign products, such as Omron, Sick, Micro-scan, Keyence, etc. These brands have many applications in China. This time we chose the Omron series of reflective laser-type optoelectronics, which are slightly more expensive but have stable performance. In addition, we also used 2 optoelectronics for the on-beam type, so the information collection is more accurate.
(2) PLC selection. The Siemens S7200 PLC can be selected, the system input and output is relatively simple, and the price is relatively favorable.
(3) Selection of variable frequency motor. Omroninverter3G3JV-AB002 can be selected to control the SEWDT71K40.37kW motor.
(4) Conveyor belt. Considering the inconsistent diameter of the vials, the production line needs bottles that are suitable for all sizes. It should be able to easily adjust the width of the strap, the width of which should be greater than the diameter of the Zui vial.
(5) Inverted bottle control. Considering the possibility of dumping the medicine bottle during the operation, and causing the medicine bottle not to be counted, we must also consider that when the medicine bottle falls down, the production line can be stopped in time and the medicine bottle can be manually adjusted.
4 PLC program design Difficulties in PLC programming for bottle counting: The program must ensure that in addition to the normal addition function, it also has a subtraction function. Since the medicine bottle will stop or retreat or advance in a special situation, there are two photoelectrics.
4.1 Logic design requirements (1) When the first photoelectric is read (consistent with the running direction) and then the second photoelectric is triggered, the counter performs the adding function.
(2) When the second photoelectric is read first, and then * photoelectric is read, the counter performs the subtraction function.
(3) Other cases are not counted.
(4) The photoelectric position is required to be parallel, and the height can be adjusted freely to suit different bottle specifications. And the photoelectric spacing should be controlled within the small bottle spacing of zui.
4.2 inverted bottle program logic design (1) when two vertical optoelectronics, one at the bottom of the vial, one at the top of the vial, and the normal operation when the vial is found.
(2) When the photoelectric detector at the bottom finds the vial, but the photocell at the top does not appear, the bottle is considered to be inverted and the stop function is performed.
4.3 Counting PLC program design The bottle counting program is shown in Figure 2. 
5 Conclusion According to the above description, it can be seen that although photoelectric counting is very common in pharmaceutical applications, its further application in specific production lines requires further research.
(Author: General Electric Pharmaceutical (Shanghai) Co., Ltd.)
[references]
[1] Jiang Wenjie, Zeng Xuewen, Shi Jianhua. Optoelectronic Technology. Beijing: Science Press, 2009
[2] Deng Haigen, editor-in-chief. Drug Validation Guide. Beijing: Chemical Industry Press, 2003
[3]ISPEBaselineGuide: Volume1~7
[4]21CFRPart11
[5] Yang Yongcai, He Guoxing, Ma Junshan. Optoelectronic Information Technology. Shanghai: East China University Press, 2009
Application of photoelectric counter in counting of medicine bottles
Abstract: The application of photoelectric counter on packaging line is expounded, and its configuration is introduced.
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