Siemens S7 - SMART series PLC application in the edible fungus laboratory - 200 Industrial control -

1 introduction the good production environment is to ensure that the key to the success of edible fungus cultivation, edible fungus cultivation environment contains air cleanliness, air temperature, humidity, PH, light, co2 concentration, pressure, etc. , fan, compressor, edible fungus cultivation control system by controlling the heater, humidifier, air valve, such as equipment, cultivation of edible fungi production the whole process for precise management, improve the efficiency in the cultivation of edible fungi.

2 technical requirements in this project is located in zibo city of shandong province, cultivating products for mushrooms. The main technological process: substrates cooling, vaccination, mycelium cultivation, the mushroom.

substrates precooling: by outdoor air at low temperature for preliminary cooling substrates. Cooling:

after the precooling of further cooling substrates, such as outdoor environment temperature meet the cooling demand, give priority to use outdoor natural cold source, skimpy share using refrigeration unit to meet the technological requirements, substrates 20 plus or minus 2 ℃ temperature requirements.

: inoculated room temperature 20 plus or minus 2 ℃.

hypha culture: the pure environment control in 20 - temperature requirements 23 ℃ + / - 1 ℃, humidity 60% plus or minus 5%.

the mushroom: required temperature high temperature at 18 20 ℃ + / - 1 ℃, low temperature 10 ℃ + / - 1 ℃.

3 automation platform selection 3. Control scheme 1

Siemens S7 - 200 SMART series PLC, small volume, high speed, standardization, network communication ability, more functions and high reliability. Controller ontology standard Ethernet interface, integrates the function of powerful Ethernet communication, through the Ethernet interface can also communicate with other CPU module, touch screen, computer, network easily. Controller integrated Micro SD card slot, the use of common on the market of Micro SD card program updates and PLC firmware upgrade can be realized, bringing great engineer support for the end user's service, also saves returned to the factory service for PLC firmware upgrades for the inconvenience. The CPU supports standard TCP/IP protocol, can access Ethernet, realize the centralized control.

this system is the main control target temperature, humidity, co2 concentration, according to the functional division control area, select a set of based on S7 - 200 SMART SR40 CPU control system used in precooling room, cooling chamber and inoculation room, a set of based on S7 - 200 SMART SR60 CPU control system for the three pure, a set of based on S7 - 200 SMART SR60 CPU control system used in the mushroom room 5. Analog acquisition part due to the large number, use the special analog acquisition module. Choose kunlun state of 7 inch touch screen man-machine interface. PC centralized monitoring software use sunway configuration software, the application of CPU ontology standard Ethernet interface communication.

3。 2 I/O list

according to the need to control the equipment and monitoring control points, the number of I/O list each system are as follows:

among them 1 # system of precooling room, cooling chamber and inoculation room, 2 # system for three rooms were examined, the mushroom room between 3 # system for five.

3。 3 PC centralized monitoring solution

this project application sunway configuration software, the software integration in the S7 - 200 SMART series PLC of the Ethernet driver, the diagram below:

according to equipment configuration wizard to complete the I/O device configuration, the diagram below:

system CPU IP address option within the same network segment: 172. 16. 1. * ( Can be modified in the HMI) 。

4 4 programming. Control flow chart 1

control program is mainly to control the parameters needed for a room, the main control process as shown in the figure below:

4. Two analog input processing

humidity and carbon dioxide detection signal is 4 ~ 20 ma, 0 ~ 100%, the corresponding humidity carbon dioxide 0 ~ 10000 PPM, by S7 - 200 SMART controller configuration, programming and operating software STEP 7 Micro/WIN SMART can easily create add users of libraries, which has the function of general block encapsulation for the user library application, convenient call, improve programming efficiency. Analog handler as shown below:

4. 3 IP address modification

if you have many sets of the same equipment need to be networking, you need to all the devices CPU for IP address changes, through access to the IP address ( GIP_ADDR instruction) And set up the IP address ( SIP_ADDR instruction) To set the CPU, this project use this feature, the diagram below:

4. 4 and man-machine interface communication

this system on the operation panel to choose the kunlun state of 7 inch touch screen, S7 - 200 SMART controller via a serial port communication with touch screen, the communication Settings are as follows:

controller side:

HMI side:

4. 5 upper unit state

this system can realize the centralized control, local control and the upper machine PC centralized control can realize data collection and processing, equipment condition monitoring, remote control equipment, system parameter setting, etc. Part of the real-time monitoring picture is as follows:

5 end with Siemens S7 - 200 SMART series PLC controller in the successful application of this project, to ensure the safe operation of efficient and stable air conditioning equipment, various controlled indexes meet the requirements of the user process. Siemens S7 - 200 SMART series PLC system with the integration of the Ethernet interface brings convenient networking, stable high-speed communication; Controller integrated Micro SD card slot for user application brings great convenience to upgrade, improve the efficiency of the engineering design personnel.

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