Official treatment
1. Turn off the firewall
2. Configure the network card in the control panel PG/**
3. Install your own computer’s official network card driver
Tag: mpi
Three methods of Siemens PLC serial communication
1, RS485 serial communication
Most of the third-party devices support, Siemens S7 PLC can control serial communication by selecting the free port communication mode. In the simplest case, only send commands (XMT) to send information to third-party devices such as printers or inverters. In any case, it must be programmed by S7 PLC. When the free port mode is selected, the user can control the operation of the communication port by sending an instruction (XMT), a receiving finger (RCV), a transmission interrupt, and receiving an interrupt. Siemens S7200
2, PPI communication
The PPI protocol is the most basic communication method of the S7-200 CPU. It can communicate through its original port (PORT0 or PORT1), which is the default communication method of the S7-200 CPU. PPI is a master-slave protocol communication, and the master-slave station is in a token ring network. The user network can read and write instructions in the CPU, that is, the network read and write instructions are run on the PPI protocol. Therefore, the PPI can only write the program on the main station side, and the network read and write instructions of the slave station have no meaning.
3. MPI communication
MPI communication is a simpler communication method. The MPI network communication rate is 19.2Kbit/s~12Mbit/s. The MPI network supports up to 32 nodes and the maximum communication distance is 50M. The communication distance is long, and the communication distance can also be extended by the repeater, but the repeater also occupies the node. MPI network nodes can usually hang S7-200, human interface, programming devices, and so on.
Siemens PLC S7-200 RS232 wiring method and pin definition?
The communication port on the S7-200 CPU is RS485.
Its pins are defined as follows:
Pin No. Port 0/Port 1
1 chassis grounding
2 logically
3 RS–485 signal B
4 RTS (TTL)
5 logically
6 +5 V, 100Ω series resistor
7 +24V
8 RS–485 signal A
9 10-bit protocol selection (input)
Connector housing chassis ground
The S7-200 can support various types of communication networks. Make a network selection in the “Set PG/PC Interface” properties dialog. A selected network will be used as an interface. The various interfaces that can access these communication networks include:
Multi-master PPI cable
CP communication card
Ethernet communication card
The following steps allow you to select the communication interface for STEP 7–Micro/WIN. See Figure 7-1.
1. Double-click the icon in the Communication Settings window.
2. Select the interface parameters for STEP 7–Micro/WIN.
What are the Siemens PLC communication protocols?
Siemens PLC has 4 categories, dozens of model types, different communication protocols supported by PLC are also different.
The protocols supported by the S7-200 series are: PPI, MPI, PROFIBUS, Ethernet, S7 protocol, AS-INTERFACE, USS, MODBUS, and free port.
The protocols supported by the S7-300\400 series are: MPI, PROFIBUS, ETHERNET, ISO, ISO-ON-TCP, MODBUS, etc.
The same point is the same for the same protocol physical transmission medium. For example, the S7 protocol can use DP and Ethernet as transmission media.
The difference is that each protocol corresponds to a different configuration and program
How many 485 communication ports on plc
Some plc is no 485 communication port, such as Mitsubishi, Delta has one and a 232, and some have only one 485
Siemens PLC and inverter use RS485 to realize communication. There is a 485 male connector and a five-core cable. How to weld this connector?
Siemens and inverters have a variety of communication protocols, such as modbus, USS, DP, etc., but all communicate through the 485 port on Siemens PLC. Siemens’ 485 port definition is 3 feet for A+ and 8 feet for B-, so You can check the manual of the inverter and see which two feet of the communication interface are connected.
remember:
3 feet: RS485 send/receive + signal
8 feet: RS485 transmission / reception – signal
Other feet are generally not connected.
What is the RS485 communication protocol?
RS485 is a physical layer is not a communication protocol, there are many communication protocols with RS485 as the physical layer, such as: MODBUS, Siemens PROFIBUS DP, PA, MPI, PPI, and so on.
How to change s7200 communication protocol mpi to ppi
The communication of the S7200 is the PPI protocol.
MPI communication is only used when the S7200 exchanges data with the S7300 and S7400.
Siemens S7-300/400 PLC USB-MPI cable programming cable circuit diagram
W77E58P is a protocol conversion chip that needs to be programmed and burned to work.
CH341A needs to install USB to serial port driver
What is MPI cable?
MPI (Multi-Point Interface) is a technical term for SIEMENS. The interface on the S7-300/400 PLC is MPI. The MPI cable is a cable with one end connected to the MPI interface, and the other end can be in other forms, such as:
PC-MPI cable;
USB-MPI cable;
HMI-MPI cable; hmi-mpi cable from different manufacturers cannot be used universally, wiring pins are different
Siemens MPI cable production wiring
Where can I change the baud rate of the USB interface?
Siemens PC adapter USB connected to the S7-300 PLC, but the communication is not on, the driver is installed, I remember that after selecting the MPI interface in the Set PG/PC, it depends on the baud rate, it seems to be 1.5M, then in the device management Inside the Ports, find the U port of this line, modify the parameters of this U port, consistent with the properties inside the MPI line to successfully connect, now can not find this U port in Ports. Where can I modify it? ? ?
The PLC connection of Siemens S7-300 and S7-200 does not require setting the baud rate. It can be obtained directly by searching. When connecting, pay attention to the default baud rate and the dialing code on the programming cable.
PLC Cable 