Square temperature and humidity centralized monitoring system practical plan

The application of environmental monitoring sensors such as large-scale warehouses, large-scale production plants, squares, and warehouses is increasing, especially the monitoring of temperature and humidity is the most typical. What followed was the display of detection quantities and a unified monitoring system.
The first is the problem of large-screen display. Currently, large-screen displays on the market use multi-dot dot matrix LED displays. This method can display multi-channel detection and can be observed from a distance, but its disadvantage is that the cost is too high. For systems that only require temperature and humidity display monitoring and centralized monitoring, the disadvantages are more prominent.
This article describes a suitable environment for archives, libraries, grain warehouses, ammunition depots, workshops and other special requirements for temperature and humidity environments, with RS485 signal output, large temperature and humidity display, temperature and humidity respectively upper and lower limit control Control monitoring system.
The system displays, controls, and collects part of the temperature and humidity measurement and control instrument. It can define the parameters of the form item through the touch buttons of the wire controller, and the long-distance wire control method enables the user to operate conveniently and quickly. Parameter power-down is not lost. The instrument shell is made of high quality cold-rolled steel, which is characterized by beautiful appearance and sturdiness. The large-screen display adopts a 5-inch/4-inch bright red LED luminous tube display, which is visually conspicuous and can be seen in values ​​50 meters away. Instrument with temperature and humidity sensors can be widely used in different temperature and humidity measurement, measurement and control areas.
main feature:
â—† Microcomputers are used as the main control center, which reduces external components and improves reliability.
â—† Using WATCHDOG circuit, software traps and redundancy, power-off protection, digital filtering and other technologies, focusing on fault tolerance at the scene, so that the whole machine has a strong anti-interference ability.
â—† Double four-digit LED display shows the measured value of each loop.
â—† Can carry the standard MODBUS RS485 communication function, adopts the form of the multi-monitor network of the bus form to upload the computer unified sampling and monitoring. The system communication protocol can be compatible with all domestic and foreign industrial control configuration software component drivers. It is convenient for customers to develop centralized monitoring PC software according to their functions. Jiuchunjian Technology also provides corresponding centralized monitoring software.
â—†With sound alarm, or temperature/humidity chalk upper and lower limit four limit control, and with control return difference setting.
â—† Long-distance remote control parameter setting makes it easy to operate.
system introduction:
1) Each monitoring instrument outputs RS485 digital signal can be directly networked communication, upload the computer.
2) Due to the adoption of advanced digital and network technologies, this solution is network-based and convenient and economical.
3) Because each measurement and control instrument output is RS485 digital signal, the attenuation of the signal transmission process will not affect the system accuracy, and the transmission distance is long, and the distance from the computer can reach 1200 meters directly. If the transmission distance through the 485 repeater can be further . A 485 bus can be connected to 99 FMC600I temperature and humidity measurement and control instrument.
4) The computer can automatically identify the device address through the host computer software, so that the overall configuration and expansion of the system is convenient, and the installation position of the sensor and the number of sensors used can be appropriately selected according to the on-site installation conditions so as to reduce the cost.
5) Using the configuration software technology based on win98/nt/XP platform, according to different customer needs, convenient and rapid generation of personalized human-machine interface.
6) Standardized bus design allows easy expansion of control and other functions and interconnection with other systems.
Overview:
The system configuration is divided into the following parts: (System connection diagram shown in Figure 1)
Upper computer:
Function: Data processing and user interface hardware requirements: Ordinary PC, compatible or industrial control can be.
Software: Configurable king, Centurystar or foreign configuration software or custom program single-port isolation 232/485 conversion interface or 485 repeater (market available)
Control output: four-loop temperature and humidity control relays, each circuit can be brought on, lower limit alarm control output, control output capacity of AC220V/5A, can directly control the 1000W within the humidification / dehumidification / heating or refrigeration equipment.
Communication instructions:
1) When RS485 network, or communication distance increases (≤1200m), or baud rate increases, a line matching resistor of about 120Ω should be connected between A+ and B- at the last node of the network. The reliable operation of the network.
(2) When the number of RS485 network nodes increases (≥32) or the communication distance exceeds 1200m, an RS485 repeater should be properly added to the network. (preferably isolated) to ensure smooth network communication.
(3) RS485 equipment, as a node in the 485 network, should pay attention to the installation in the network. The network structure should be ensured as a trunk line. The branch line introduced by each node should be as short as possible to avoid clutter and affect communication.
(4) It is best to use shielded twisted pair for the communication line of RS485 network. A+ and B- are one pair, and the shielding layer should be grounded at the source of the network at a single point, which can effectively prevent outside interference.
(5) RS485 network trunks, when wiring, in order to avoid close to and parallel to the power line system power line, as far as possible with some distance arrangement.

This Simple Electrical Sock Boarding Machine takes a very limited space. It is widely used in the small scale production unit. It's a highly recommended economic boarding machine within the quantity of 10 sets of Sock Knitting Machine.

Simple Sock Boarding Machine

Automatic Sock Boarding Machine,Sewing Packing Machine,Sock Forming Machine,Steam Sock Boarding Machine

Shaoxing Rainbowe Machinery Co., Ltd. , http://www.rainbowe-machinery.com