Using the Siemens S7 400 PLC and 6 se70 realize in the application of plate heat treatment production line -

1, the system description

with the rapid development of economy, the manufacturing industry of medium plate quality request is higher and higher, shanxi taigang group linfen iron and steel co. , LTD. It is on this market demand and thick plate in the construction of a new heat treatment production line. Its production process including heating, quenching, cooling, cold plate, shot blasting and cutting sample, etc. The main equipment including: chuck hanging, often furnace, hardening machine, flower roll cutting, straightening machine, shot blasting machine, sampling, pressing machine, plasma cutting machine, etc. Including pressing machine and plasma cutting machine is offline devices used for processing in more than 40 mm thickness steel plate. System process flow is shown in figure 1. 1

1) the system Overview

system equipped with basic automation level and monitoring management level two levels of automation system, basic automation level through PROFIB US - DP fieldbus network communication, monitoring and control management level is to communicate through ETHERNET network, forming a distributed computer control system. It is characteristic of parallel computing, centralized management and decentralized control, resource sharing and so on.

system adopts Siemens PLC ( PLC） Control, rectifier inverter ( 6SE70） Transmission; Between the basic automation system and drive system via PROFIBUS - DP network to exchange information, constitute a fully digital control system.

2) Automation system

automation system using the Siemens S7 400 PLC CPU 4 l2 - 2 dp CP443 - and configuration 1 Ethernet card, use the remote I/O control scheme. Remote I/O module scattered at the scene of each work station ET200M from site. PLC through integrated DP interface and communicate with ET200M transmission device, and through CP443 - 1 to upper management to communicate with the computer. Using network communication way to replace the equipment point to point connection mode, improve the reliability of the system, reducing the workload of maintenance, improve the production efficiency, and make the scene to adjust or function extension has considerable flexibility. 2 network structure and data communication

1) PROFIBUS bus

PROFIBUS is an international, open and does not depend on equipment manufacturers of fieldbus standards he is made up of three compatible parts: PROFIBUS - DP ( DecentralizedPeriphery) ．PR0FIBUS— PA（ ProcessAutomation) 、PROFIBUSFMS（ FieldbusMessageSpecification) 。 The system adopts the PROFIBUS - 6 KB/s to 12 MB/s. 5 KB/S, to ensure the stable and reliable communication. PROFIBUS bus access protocol USES the master station and from the stand of master-slave mode. According to the requirement of the system, using two levels of control network in the system: basic automation level and management level. Basic automation level by PLC, I/O devices on site and inverter device, etc. Monitoring management level for the industrial computer.

2) Network structure

LinGang medium plate heat treatment production line with p R O F IBUS - DP bus network, the network structure as shown in figure 2.

PLC through the two DP after 13 respectively and inverter device and ET200M and coupler formed two PROFIBUS DP network, and through PROFIBUS DP network, PLC and they constitute a master-slave relationship forms of communication protocol. Figure on the left side of the heat treatment PL C station is given priority to, right at the top of the DP 45 sets of inverter, mesh belt transmission for roller table from the station to complete the driving function of the I and the bottom of the DP network with 5 ET200M and four DP coupler is formed from the station, to complete the scene I / 0 signal input and output and its control interlock with other equipment.

3) Hardware and software configuration

system set a Siemens S7 - 400 PLC CPU for 4 l 2 - 2 dp, communication card for CP443 a l, and set up a separate control cabinet.

main electrical room set up an industrial computer HMI, to maintain and monitor the running status of the production line equipment. Control components and ET200M remote station installed on the roller table of the main equipment in work station or work station, the transmission device is equipped with CBP2 communication board of Siemens 6 se70 inverter device, a total of 45 units. 0, remote I/O station USES ET200M.

4) Data communication

data communication of the system include the p L C and actuator, PL C and the data exchange between ET200M.

( 1) PLC and drive through its own integrated communications PLC DP interface as master station, drive from the station, the main cycle from the station to initiate communication, from the station only to respond. Communication must first by STEP7 programming software in the for the network configuration and parameters setting, network configuration, including configuration and the main configuration from the station.

configuration the main hardware configuration:

through hardware configuration window, according to the hardware installation order and order number, in turn, inserted into the chassis, the configuration of the power, CPU, etc. And new PROFIBUS network configuration of PROFIBUS station address, select transfer rate and how it works.

configuration from the station

hardware configuration: in DP web link inverter device, set the inverter device of PROFIBUS station address and configuration of inverter device communications area. Choose a different type of PPO can specify the size of different communication interface area. Data structure type PPO including PPOl to PPO5 a total of five. Communication to invoke system function block SFCl4, SFCl5 data unpack and pack.

PLC as master station through PROFIBUSDP network cycle to ET200M IM153 communication module by the communication, and IMl53 by DI, AI template receiving work station or external signal, through the DO, AO template execution PLC instruction, so as to complete communication tasks.

2, epilogue

field bus in the use of the system, reduce the number of the hardware and installation, save the cost of investment and time, improve the reliability and accuracy of the system. The initiative and the user has a high degree of system integration. Since put into production operation is very stable effect is good.
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