How does Siemens PLC in the factory control room collect the production data of multiple production lines in a centralized and wireless way?

This scheme is based on Modbus RTU Implemented under the agreement 1 Wireless communication form of master-slave ad hoc network , The main station is S7-1200 PLC,DTD433F As a slave station .DTD433F It has the function of inputting and outputting analog signals , The direction of signal transmission is determined by the functions realized by the master-slave equipment of the user's original system . Wireless analog signal measurement and control terminal is adopted in the scheme DTD433F European and American Department PLC Wireless communication terminal DTD434MC, As a hardware device to realize wireless communication .

One 、 Program Overview

wireless Modbus Network composition

  Two 、 Test equipment and parameters

1. Hardware environment construction ：
● master device ： Siemens S7-1200
● Slave devices ：DTD433FC *4 platform
● Wireless data terminal （ master device ）DTD434MC*1 block
2. Test parameters ：
● Communication protocol ：Modbus RTU agreement
● Master-slave relationship ：1 Lord 4 from
● Master station communication interface ：Rs485 Interface
● Slave interface ： analog signal （AI/AO）
● Power supply ：9-24VDC
● transmission distance ：100 rice ,500 rice ,1KM,3KM,20KM

  wireless Modbus Analog measurement and control terminal DTD433F Provide analog signal input and output interfaces , accord with MODBUS RTU agreement , It can be used as a slave , Acquisition sensors 、PLC、DCS、 Data of intelligent instruments and other equipment , And master station PC、PLC、 Configuration software 、 Touch screen 、 The man-machine interface constitutes the wireless ad hoc network communication system .

■ Lord want , sign :

◆ Analog input ：1-8 passageway AI Input ,0~5V Voltage signal or 4~20mA Current signal input ;
◆ Analog output ：1-8 passageway AO Output ,4~20mA Current signal output ;
◆ It can directly replace wired transmitter , Realize wireless sensor cluster networking ;
◆ transport ： All digital wireless encrypted transmission ;
◆ Support standard serial port protocol ： Datai free serial port agreement 、MODBUS RTU agreement
◆ DC wide voltage 9~24VDC Power supply , The average operating current is less than 50mA

Four 、 Device configuration

1. New project , And add 1 Group devices
2. Open the project to configure the equipment
3. choice CPU：CPU 1211C AC/DC/Rly Under the 6ES7 211-1BE40-0XB0

4. Add communication module
Under communication module, select Point to point —— Re selection CM1241（RS422/485）—— The final choice 6ES7 241-1CH32-0XB0 model
5. Check the device configuration and set parameters
As shown in the figure below , Set parameters as needed , We use default values here

 6. Add a new block under the program block
choice DB（ Data blocks ）, And automatically generate background data
7. Add data group
In the new data block DB1 Add data groups as shown in the figure below
8. Master station configuration
The program programming is shown in the figure below

  After completion , Load master PLC You can talk to the slave station DTD433FC Conduct wireless Modbus Communications .

5、 ... and 、 Test instructions

View relevant data through the monitoring and enforcement table