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The TV monitoring system designed and constructed by the ** company has been put into trial operation. The host of the system adopts the AD2050R 320-96 matrix video switching system produced by the internationally advanced American AD company. At present, the scale of the system that has been realized in the first phase of the project is 161 camera monitoring points, including S1 black and white camera points and 100 color camera points. 133 AD decoders control I26 camera lenses and PTZs. The system has 23 sub-control keyboards and 68 video image display points, which are distributed in 17 main and sub-control rooms. And set up multiple priority levels, which can realize on-site monitoring, workshop management control, whole plant management monitoring and safety reinforcement monitoring, as well as multi-priority Jun group control.
The system also has a security subsystem, including 38 infrared and microwave anti-theft tracers and 42 infrared lamps. With the function of alarm preset, it can respond to the alarm signal, automatically start the recording setup, switch the monitor image, and turn on the alarm and lighting.
After nearly a year of trial operation, the system has stable and reliable performance and has been well received by users.
The scale of the monitoring system
The scale of the system that has been realized in the first phase of the project is as follows:
181 camera monitoring points (video matrix input points), including 81 black and white camera points and 100 color camera points;
Among the 181 camera monitoring points, the 125f solid with PTZ control, 133 AD decoders complete the PTZ and lens control.
68 video image display points (video matrix output points);
23 sub-control keyboards, distributed in 17 main and sub-control rooms. There are eight priority levels for system priority operation. Currently, there are three priority controls, which clearly define the channels between keyboards, monitors, and cameras. The security subsystem provided by the system. The security subsystem is equipped with 38 infrared and microwave anti-theft detectors and 42 infrared lights.
This system is designed with sufficient margin. The current design scale of the system is 320 channels of video input, 96 channels of video output, 21 sub-control keyboards, 54 security alarm contact circuits, and 32 programmable control insulators to achieve alarm output response, and the system has the ability to further expand.
2. Function of monitoring system
The CPU hot backup technology of the system: the system host equipment adopts the rib 2050 switching/control matrix device of AD company of the United States. The host device is composed of AD2016VIM. 2 Video input and output controller, AD2024VOM video output and input controller, AD1996 data processing controller (CPU), AD2010RX matrix controller, AD2020RX matrix controller. AD2050 matrix switching/control system adopts CPU hot backup technology, which ensures that once a C recess fails during operation, another CPU will be automatically selected to provide system control through A☆985 “hot backup switch” to ensure the normal operation of the system. .
Video Switching Control: The AD2050 controls the switching of all camera inputs and monitor outputs in the switching system. Switching operations are automatic actions in response to operator keyboard input or programmable tours, group switching, timed events, or alarm responses.
Alarm response: An alarm is a signal (can be regarded as an alarm contact) generated by an external device (sensor, etc.) connected to the AD2050. When an alarm occurs (received), the camera is automatically called to display on the monitor. The system is equipped with an anti-theft alarm monitoring function. 36 infrared microwave dual-detection detectors and 42 infrared lighting lamps are installed in the central equipment room, warehouse, packaging workshop, and important aisles, etc. The host immediately responds and starts automatically when an abnormal situation occurs. Infrared light and camera, and can synchronize video recording and alarm.
System status display: The operator can request to display the current camera video input description on the monitor. It can display the current status of each monitor and the currently running system tour.
External control input: The RS-232 port of AD2050 allows system control through keyboard, computer or other equipment, each RS. 232 port is set as printer alarm output or as the upload/download port of system setting data.
System Control Output The AD2050 provides a control code output that can transmit switching and Uf design to the control list of other matrix systems.
System security: The system has several sets of security measures to prevent users from accessing the system or the special resources of the system. The password login/exit provides the operator password entry function, which enables the operator who only has authority to operate the system. Access Priority: Provides 8 priority levels for keyboards and users. Each priority level can be programmed to restrict specified access. The system currently has 3 priority levels.
3. Technical indicators
Under standard illumination, the system image quality is not lower than level 4. The image level resolution is not less than 400 lines for black and white TV systems, and not less than 270 lines for color TV systems. The gray level of the image screen is not low and fine. The level of each video signal of the system at the monitor input end meets 1VPP heart dBVBS.
The image has no group wave interference and jitter, the characters are clear, stable and accurate, the switching is free from confusion and shadows, the communication is smooth, and the image switching time is less than 16MS.
When the system is used in low illumination, the system signal-to-noise ratio is not less than 25dB.The acceptance team composed of all parties shall conduct acceptance according to the requirements of the system technical indicators in the contract.
The results fully meet the technical standards stipulated by the state.
Several technical points in project implementation
1. Selection of key equipment The selection of key equipment is extremely important in system engineering. The matrix switching system used for video signal switching and control in large-scale industrial TV monitoring systems is the key host equipment. Therefore, the user has conducted a number of important foreign manufacturers such as: AD, PELCO, VICOM, BURLE companies in the United States, PHI, MOLYNX companies in Europe, SONY, PAN Peng ONIC, and VC companies in Japan on the reliability of the matrix system. , advanced nature, scalability, cost performance ratio, international and domestic application performance, and conducted extensive research, and invited relevant experts to discuss the issue of host equipment selection of industrial TV proximity systems in Shanghai Cigarette Factory. The AD2050 matrix switching/control system produced by AD Company of the United States wins with its advantages in all aspects. After three months of operation, the system has proved that its host equipment is mature, advanced, reliable, and expandable, and it fully meets the requirements of Shanghai Cigarette Factory’s industrial TV monitoring.
2. Signal transmission and equipment arrangement. In order to ensure the image quality index, the black and white camera selects the horizontal resolution of 5 lines, and the color camera selects the horizontal resolution of 480 lines. In long-distance transmission, the strength of the TV signal is ensured, and the net attenuation from the sender to the receiver is not greater than 3dB. In the design, consider adding a video signal amplifier to the line larger than this index to compensate for the line loss. At the same time, for the uneven frequency response that may occur in the transmission, if the unevenness is greater than 3dB, an electric drill equalizer is added to compensate. The camera installation point should avoid strong electromagnetic interference sources as much as possible, and the camera installation point should be stable and firm, within the field of view of the lens, and avoid direct strong light. The host equipment installation frame considers ventilation, heat dissipation and maintainability.
Three, grounding, power supply, shielding, wiring. The quality of the power supply and grounding of the system directly affects the anti-interference ability of the system. The general idea is to eliminate or weaken the interference, cut off the transmission path of the interference, and improve the attenuation effect of the transmission path on the interference. The specific measures are:
Grounding: The whole system is grounded at a single point, the grounding bus is made of copper wire, and a comprehensive grounding system is used. The grounding resistance should not be greater than 1Q. Strict isolation between them, separate power supply, and signals are concentrated in the central computer room.Due to the scientific and reasonable grounding measures, the anti-interference of the system is effectively guaranteed.
Power supply: The power supply of cameras, controllers, monitors, etc. is centrally supplied by the control room.
The power supply of the system is led out of a dedicated circuit by the low-voltage power distribution panel. (It cannot be led out from the power distribution box). After the filter and the AC voltage stabilizer (also known as the purification power supply), it is supplied to the power distribution box in the control room.
Shielding: The video transmission cable, the power line and control line of the camera are all laid through metal pipes, and the metal pipes are grounded. The video transmission electric drill is not managed together with the power cord and control line.
Wiring Fu, power lines, and control lines are not co-located with power lines. The entire cable should be used as far as possible to transmit the electric drill and control wire, and manual connection and lengthening of the electric drill are not allowed.
Fourth, the maintainability of the system: in addition to the selection of equipment should have good maintainability, the project implementation should also fully consider the maintainability of the system. In the system, a video electric drill and a switch junction box for controlling the electric drill are installed in the distribution shafts of each floor to facilitate future testing and maintenance. Since there are thousands of video cables, control cables, and power cables, it is necessary to number each cable with a sleeve marked with a number one by one. The system has an appropriate amount of spare parts and spare parts. Provide accurate drawings and data. Do a good job in the training of various personnel.
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