![]() Our port settings are set to the following. Select the Ethernet Port tab along the top of the screen. This will bring up the P1-540 CPU model window. Double click on the CPU unit outlined in green. The hardware configuration window will now be displayed. Under the Setup in the Application Tools select Hardware Config.Īlternatively, you can also use the main menu | Setup | Hardware Config. Productivity 1000 Port Setup – Modbus TCP Client A review of the Modbus TCP protocol can be seen at the following URLs. The client sends a request and the server will respond to that request only. This is a client (master) / server (slave) protocol. Modbus TCP protocol through the Ethernet port (RJ45) is the method in which we will communicate to the Click PLC. This will go through most of the features of this cost-effective programmable logic controller. More information can be obtained by going to our Click PLC Series page. Select OK to close the address picker window. Ensure that display Modbus Address is selected. On the left side of the address picker edit mode, select the DH area. You can also get to this by the main menu | Program | Address Picker… or use CTRL + T. Select Address Picker under the Ladder Program in the Navigation menu. We will now find the Modbus addresses that we need from the Address Picker in the Click programming software. Select OK again to close the COM Port Setup. Select OK to close the Com Port Setup Details. We will leave everything else as a default. This is the default port for Modbus TCP Protocol. Since the Click PLC will be configured as a Server (Slave), ensure that the TCP Port Number is set for 502. The default gateway will be left at 0.0.0.0 so it is not exposed to the internet. We will use the manual settings for the Network Address Configuration. You will notice that the Modbus protocol is already selected. You can access the Com Port Setup by using the main menu | Setup | Com Port Setup… The first thing that we will do is set up the Click PLC Ethernet port. Click PLC Configuration – Modbus TCP Server This includes the existing 10, plus the 10 read registers from the 3rd PLC. We would then write 20 registers to the Click PLC. Read 10 registers and write 20 registers from and to the 3rd PLC. Note: If we wish to extend our network with a third PLC that would share information to the network we would do the following. We will be writing and reading 10 16bit registers each to and from the Click PLC from our Productivity 1000 PLC.ĭH1 -– P1000_Net_Write1 – Bit 1 = Heartbeat Bit (1sec on 1sec off)ĭH12- P1000_Net_Read2 = Throughput Time Captured Productivity to Click PLC – System Configuration Watch the video below to see the running and configuration of the Modbus TCP Ethernet Communication from the Productivity 1000 Series PLC to the Click PLC. The program with compiled Python library, you will find here.Productivity 1000 PLC to Modbus TCP RTU Remote IO Controller BX MBIO Lucikly, the second library works perfectly (inside the library you will find the code responsbile for assign high prority fot this task). First of all - there is small mistake in for loop (some bits are omitted), secondly - Raspbian is not Real Time OS, so counting time on the level of μ seconds without any prioritization of threads makes that reading values from DHT11 is highly error-prone. However, I recommend to use the second one, because the first one is not working. I found two Python libraries that enable to read data from this sensor: In my example, Raspberry Pi works as a Modbus TCP Gateway that transfers data about temprature and humidity. Values = context.getValues(register, address, count=5)ĬtValues(register, address, values) In this line, the current values are retrieved: The function that is responsible for udpating the Modbus memory - context - is called "updating_writer". In this programme, server updates their registers you will find here: To make it easy, I've based my code on the example from pyModbus. Finally, we can look at Modbus TCP Server.
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