Based on the wireless MODBUS communication - 200 PLC Industrial control -

To see someone put forward the connection problem. Screen and PLC are just at hand, considering the Siemens 200 smart ontology integration of RS485 communication port does not support PPI protocol, programming the PLC controller communication mouth first initialized to support free MODBUS protocol, and then to connect to the screen.

1。 The PLC will run the following program download ( 200 smart PLC communication port address 3, 9600 baud rate, parity checking)

2。 Configuration screen end connection as follows, Use standard modicon MODBUS - RTU protocol, screen COM2 port Settings, 8, 9600, 1)

3。 Connection screen COM2 PORT 0 with PLC controller, download the configuration program after the operation, the screen can't connect with PLC. But using a serial port software can connect the PLC communication ( MODBUS - send a standard format RTU message, PLC has a response) That initializes the PLC communication mouth there is no problem. Now suspect the kunlun state of the touch screen can connect 200 smart in this way. Used to have such case?

serial port software has a reply message

note: 200 smart PLC and kunlun state screen using Ethernet connection has been successful.

200 PLC wireless technology zone based on MODBUS communication smart factory into rapid growth forecasts market scale of up to 2054 in 2022. $200 million Internet, industry, 4. 0 and energy management go hand in hand overweight industrial intelligent upgrade 'made in China 2025' and auto manufacturing chip assumes the role what is analytic linear stepper motor principle of work
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