Research and Implementation of Atlas Air Compressor Communication with Third Party Equipment
The 000m3/h oxygen control system adopts the MACSV1.1.0SP2 system of Hollysys. With the production of the second phase expansion project of stainless steel, the new nitrogen press of Atlas manufacturer has a new nitrogen press. The independent control system uses the self-developed Elektronikon MKIV controller, and the operator records and starts and stops the data of the nitrogen compressor through the LED display next to the machine. This not only increases the labor intensity of the operator, but also is very unsafe. The operator is prone to misoperation and cause parking, and the operation next to the nitrogen press machine may cause suffocation due to nitrogen leakage. Therefore, the Elektronikon MKIV controller needs to establish communication with the MACSV system through the Modbus protocol to remotely monitor the nitrogen compressor. 2 system composition oxygen is now composed of 3 sets of 6000m3 / h air separation system. The control system adopts the MACSV system of Hollysys to realize the functions of data acquisition and production process monitoring, process control, logic control and quick interlocking of air compressor, oxygen compressor, nitrogen compressor and liquid storage. The control system adopts distributed structure design, in which the main control unit adopts redundant configuration, which is used for engineering unit transformation and control calculation, and communicates with engineering station and operator station through monitoring network (Ethernet); field bus (Prmfbus-) P) Connect with each intelligent I/O unit; the intelligent I/O unit becomes the data acquisition and control output of the site; it plays the role of “centralized monitoring, centralized management and decentralized controlâ€. 2.2 PLC control system The current stainless steel expansion project adds a nitrogen press in the 6 000m3/h oxygen system. The nitrogen press control system is a set of independent systems with the main sound set. It adopts the self-developed ElektronikonMKIV I, including A small LCD screen is used to display all the unit information, with various indications, operations and alarm functions. The controller has a high degree of integration, and integrates its input/output interface and relay output terminals. At the same time, in order to overcome the shortcomings of its own I/O interface, the controller also provides an I/O expansion interface to increase the available. The number of external I/Os. 3 The establishment of communication supports three modes of local control, remote control and LAN control, and the system is easy to use. In the communication network function, the controller itself is also equipped with a LAN standard interface. Therefore, the Hollysys MACSV system and Atlas Zhufenmei, etc.: Atlas air compressor and third-party equipment communication research and implementation of MKIV control There are two ways to communicate between the devices: one is to directly install a RS485 port directly connected to the live PLC on the server to realize the communication between the PLC of the Mod-bus protocol and the MACSV system; another method can Add a FM020 communication module from the company, which supports the Prfibus-)P bus protocol, and implements the DP slave function by parameter and data exchange with the controller via the Profibus4)P bus. Considering the actual situation of the on-site production, only the former method is studied, and the function of remote monitoring of the Elektronikon MKIV controller and the DCSMACSV nitrogen compressor is established through the establishment of the configuration and communication. 3.1 Establishment and configuration of Atlas communication 3.1.1 Communication module MKIV system independently developed a serial communication module with common functions for data communication with third-party audio. After downloading the corresponding communication program, it will execute the Modbus->roxy function. The module can be mounted on the DIN-lail in the control cabinet or it can be installed separately. Before powering up the module, check that the power supply is 24VDC.Sub-) The nine-pin plug pin 1 is grounded, the pin 3 is positive, and the pin 8 is negative. Combox-S ED lights are represented from left to right: a, unused; b, unused; c, CAN reception (Combox receives CAN information); d, CAN transmission (Combox sends CAN information); e, Modbus reception ( Combox receives Modbus information); f, Modbus sends (Combox sends Modbus information); g, unused; h, unused; i, unused; j, ModbusMode; k, unused. Determine whether the communication is normal by observing the status of the indicator. Combox-S module as shown... 1.2 communication module software configuration COMBOX-S serial port set technical parameters are as follows: 485 network communication success test, such test can verify that the protocol converter works normally; at this time, the communication protocol converter 3 The , , and 5 indicators should be blinking. 3.2 The establishment and configuration of the time-sharing communication 3.2.1 and the configuration in the MACSV system. The records of the historical data are usually stored through the mapping of the database, and the database functions are also based on the server, so that Consider installing a MOXA communication card with Modbus on the server, and directly connect the Atlas COMBOX-S MACSV as the master station with the Modbus cable, and the MKIV controller acts as the slave station, thus implementing the Hollysys MACSV system. Communication between Atlas MKIV controllers. Then install the interface software on the server, and the communication execution file busMDT.exe, through the serial port, the site will follow the Modbus audio data collection to the MACSV system, and the control command can be sent to the sound to read the data from the Modbus interface. Write, operate and archive in MACSV, so that all data and parameters in the nitrogen compressor self-contained control system can be recorded and operated in the existing DCS control system. Data channel table, substation address, serial communication baud rate, data bit, stop bit and other parameters, these data should be configured into the MvMod-busMDT.INI file. The specific configuration is as follows: Blue supervision Gansu metallurgical network communication test status map: millisecond = 0 - check digit (0 - no parity, 1 check verification, 2- even parity) monthly server configuration SVRPORT = 7225 - MACSV Server port number, which is any number of 73164000 = 3 - the number of domains Domain2config - the server of the third domain, DOMAIN2SUB1ARG1, the third domain, the first subroutine, the configuration number of the first protocol, the DOMAIN2SUB2ARG1, the third domain. 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