Abstract: This paper introduces the application of V80 series PLC in the precision air-conditioning industry. It focuses on the characteristics of V80 small PLC temperature control and network communication, and proposes corresponding solutions for precision air conditioner.
Keywords: PLC, thermal resistance, precision air conditioning, MODBUS
Related equipment and industry: central air conditioning, base station air conditioning I. Introduction:
With the wide application of precision air conditioners in various industries, more and more air conditioner manufacturers are beginning to get involved. The requirements of ±0.5°CDB and ±1.5% RH for precision air conditioners make it difficult for manufacturers to reduce the cost while ensuring performance. .
Deweisen's V80 series of small PLCs have been widely used in the industry. Its superior network monitoring capability and superior PID and temperature control functions have greatly improved the functions of the whole system, while V80 is better than others. Imported PLCs with similar functions are more advantageous in terms of price.
Second, the realization of precision air conditioning technology:
The schematic diagram of the precision air conditioner is as follows:
Precision air conditioners generally have one main unit and multiple slaves. The schematic diagram is as follows:
The functions of the host are as follows:
1. Man-machine interface host PLC with human-machine interface for user's setting in the field, the set data is transmitted to the PLC on each slave through the field bus; at the same time, the host PLC can also communicate with the upper monitoring PC, so that the user can Monitor the entire plant's air conditioner through the network in the monitoring room.
2, the function of the acquisition function temperature and humidity transmitter can be sent to the host PLC, and then transmitted to the slaves through the network, or each slave can bring a temperature and humidity transmitter, all kinds of collection is responsible for Environment and temperature and humidity control.
3. The main station of the fieldbus network is responsible for data exchange with all slave PLCs.
4, the host air conditioning control host PLC on the one hand to carry out a variety of other work, and it is also responsible for the control of an air conditioner.
The functions of the slave are as follows:
1. Accept the command of the host computer and execute the user to set through the man-machine interface or the host computer monitoring software. The set parameters are transmitted to the slave PLC through the master PLC. The slave PLC controls the air conditioner valve or inverter according to the command and parameters. jobs.
2. Responsible for the control of the slave air conditioner The slave PLC is responsible for the control of the slave air conditioner.
3, local monitoring local can be equipped with human-machine interface and various screens for local monitoring.
Deweisen has proposed a more superior solution to the various problems mentioned above:
The front is the CPU module M32DT-DC, which has two communication ports, one port can be programmed online, or connected to the monitoring computer or touch screen, and the other RS485 port can be used for communication with the inverter or other instruments.
The rear E5THM is a thermocouple module, but the module not only has 5 thermocouple signals, but also has 5 PWM signal outputs. More importantly, the E5THM module itself has a CPU chip and carries a PID algorithm. The E5THM module itself is a 5-way temperature control instrument. After the CPU module sets the parameters, the E5THM module can control the on/off of the solid state relay to control the temperature stability.
If the user's inverter needs to use the analog output module, you need to add an E4DA1 module. Otherwise, you can consider using the communication port on the M32DT module to communicate with the inverter.
The program features the following:
1. Thermocouple module with strong function and high precision with temperature control function:
Not only the V80 CPU module has a PID algorithm, but the extended E5THM module also has a PID algorithm. At the same time, the E5THM has five thermocouple inputs and five transistor outputs, which can perform all temperature control work in one module. This ensures high temperature control accuracy and response speed, and can easily meet the requirements of ±1 °C.
In addition, the E5THM module supports B, E, J, K, R, S, T7 thermocouple signals to meet the requirements of various devices.
Powerful CPU module:
The M32DT module is a 16-channel digital input and 16-channel transistor output CPU module. It has two communication ports, one RS232 and one RS485. It has a MODBUS master-slave communication protocol and a FREE communication protocol. It can be used with various HMIs or A kind of configuration software communication, the communication protocol library file provided by Davison for each reflow soldering manufacturer also provides considerable convenience for each manufacturer to develop the PC software.
The M32DT has FLASH memory, which can store various parameters locally, and also has a RAM chip that is powered down to ensure the reliability and convenience of use.
The high-speed operation speed and complete mathematical operation capability of the M32DT make it easy to cope with environments that require large communication and analog processing.
2, high reliability, strong anti-interference ability The wide temperature and wide Power Supply design of the whole system makes it easy to operate in any harsh environment. In addition, the V80 full range of products have passed CE certification, and also laid a good export for users' products. Foundation.
3, high cost performance On the one hand, because of the integration of thermocouple modules, the point requirements of the entire system are minimized. On the other hand, as a domestic manufacturer, Devison has an irreplaceable advantage in terms of labor cost and brand cost, so The solution is more cost-effective than the solution using other PLCs or industrial computers plus boards.
:
Keywords: PLC, thermal resistance, precision air conditioning, MODBUS
Related equipment and industry: central air conditioning, base station air conditioning I. Introduction:
With the wide application of precision air conditioners in various industries, more and more air conditioner manufacturers are beginning to get involved. The requirements of ±0.5°CDB and ±1.5% RH for precision air conditioners make it difficult for manufacturers to reduce the cost while ensuring performance. .
Deweisen's V80 series of small PLCs have been widely used in the industry. Its superior network monitoring capability and superior PID and temperature control functions have greatly improved the functions of the whole system, while V80 is better than others. Imported PLCs with similar functions are more advantageous in terms of price.
Second, the realization of precision air conditioning technology:
The schematic diagram of the precision air conditioner is as follows:
Precision air conditioners generally have one main unit and multiple slaves. The schematic diagram is as follows:
The functions of the host are as follows:
1. Man-machine interface host PLC with human-machine interface for user's setting in the field, the set data is transmitted to the PLC on each slave through the field bus; at the same time, the host PLC can also communicate with the upper monitoring PC, so that the user can Monitor the entire plant's air conditioner through the network in the monitoring room.
2, the function of the acquisition function temperature and humidity transmitter can be sent to the host PLC, and then transmitted to the slaves through the network, or each slave can bring a temperature and humidity transmitter, all kinds of collection is responsible for Environment and temperature and humidity control.
3. The main station of the fieldbus network is responsible for data exchange with all slave PLCs.
4, the host air conditioning control host PLC on the one hand to carry out a variety of other work, and it is also responsible for the control of an air conditioner.
The functions of the slave are as follows:
1. Accept the command of the host computer and execute the user to set through the man-machine interface or the host computer monitoring software. The set parameters are transmitted to the slave PLC through the master PLC. The slave PLC controls the air conditioner valve or inverter according to the command and parameters. jobs.
2. Responsible for the control of the slave air conditioner The slave PLC is responsible for the control of the slave air conditioner.
3, local monitoring local can be equipped with human-machine interface and various screens for local monitoring.
Deweisen has proposed a more superior solution to the various problems mentioned above:
The front is the CPU module M32DT-DC, which has two communication ports, one port can be programmed online, or connected to the monitoring computer or touch screen, and the other RS485 port can be used for communication with the inverter or other instruments.
The rear E5THM is a thermocouple module, but the module not only has 5 thermocouple signals, but also has 5 PWM signal outputs. More importantly, the E5THM module itself has a CPU chip and carries a PID algorithm. The E5THM module itself is a 5-way temperature control instrument. After the CPU module sets the parameters, the E5THM module can control the on/off of the solid state relay to control the temperature stability.
If the user's inverter needs to use the analog output module, you need to add an E4DA1 module. Otherwise, you can consider using the communication port on the M32DT module to communicate with the inverter.
The program features the following:
1. Thermocouple module with strong function and high precision with temperature control function:
Not only the V80 CPU module has a PID algorithm, but the extended E5THM module also has a PID algorithm. At the same time, the E5THM has five thermocouple inputs and five transistor outputs, which can perform all temperature control work in one module. This ensures high temperature control accuracy and response speed, and can easily meet the requirements of ±1 °C.
In addition, the E5THM module supports B, E, J, K, R, S, T7 thermocouple signals to meet the requirements of various devices.
Powerful CPU module:
The M32DT module is a 16-channel digital input and 16-channel transistor output CPU module. It has two communication ports, one RS232 and one RS485. It has a MODBUS master-slave communication protocol and a FREE communication protocol. It can be used with various HMIs or A kind of configuration software communication, the communication protocol library file provided by Davison for each reflow soldering manufacturer also provides considerable convenience for each manufacturer to develop the PC software.
The M32DT has FLASH memory, which can store various parameters locally, and also has a RAM chip that is powered down to ensure the reliability and convenience of use.
The high-speed operation speed and complete mathematical operation capability of the M32DT make it easy to cope with environments that require large communication and analog processing.
2, high reliability, strong anti-interference ability The wide temperature and wide Power Supply design of the whole system makes it easy to operate in any harsh environment. In addition, the V80 full range of products have passed CE certification, and also laid a good export for users' products. Foundation.
3, high cost performance On the one hand, because of the integration of thermocouple modules, the point requirements of the entire system are minimized. On the other hand, as a domestic manufacturer, Devison has an irreplaceable advantage in terms of labor cost and brand cost, so The solution is more cost-effective than the solution using other PLCs or industrial computers plus boards.
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