Today, we will conduct a practical test to see how fast the communication speed is when implementing Modbus TCP communication with different brands of PLCs or boards.
Testing Interface
We used our self-developed communication library for testing. Different communication libraries may have slight differences, and the test results are for reference only and do not target specific products or manufacturers.
Below is our PLC platform, from which we selected several commonly used PLCs that support the Modbus TCP communication protocol for testing.
The design interface of the testing software is shown below:
The default port number for Modbus TCP is 502, so the only difference between devices is the IP address. To ensure data accuracy, we used a loop reading method, looping three sets, with each set reading continuously 10,000 times, observing the total time taken.
At the same time, the storage area we read is the same, reading 100 registers starting from area 4.
Siemens 200 Smart
For the Siemens 200 Smart PLC, we used the CPU ST40. As we all know, to support Modbus TCP communication with Siemens PLCs, a bit of PLC programming is required, as shown in the figure below:
The test results are shown below:
Siemens 1200
For the Siemens 1200 PLC, we used the CPU 1215C DC/DC/DC. The Siemens 1200 also requires a bit of PLC programming, as shown in the figure below:
The test results are shown below:
Siemens 1500
For the Siemens 1500 PLC, we used the CPU 1511-1 PN. The Siemens 1500 also requires a bit of PLC programming, as shown in the figure below:
The test results are shown below:
Mitsubishi FX5U
For the Mitsubishi FX5U PLC, we used the FX5U-32MT/ES. The Mitsubishi FX5U PLC directly supports Modbus TCP, but configuration is required to add the Modbus TCP connection device in the Ethernet configuration, with the port number set to 502.
The test results are shown below:
Schneider M241
For the Schneider PLC, we used the Schneider M241, which does not require additional PLC programming.
The test results are shown below:
Xinjie XD5E
For the Xinjie PLC, we used the Xinjie XD5E. Domestic PLCs have good support for the Modbus protocol and do not require additional PLC programming.
The test results are shown below:
Delta DVP
For the Delta PLC, we used the Delta DVP-32ES, which does not require additional PLC programming.
The test results are shown below:
Inovance AM600
For the Inovance PLC, we used the Inovance AM600-CPU1608TN, which does not require additional PLC programming.
The test results are shown below:
Inovance H5U
For the Inovance PLC, we used the Inovance H5U, which does not require additional PLC programming.
The test results are shown below:
Inovance EASY
For the Inovance PLC, we used the Inovance EASY521, which does not require additional PLC programming.
The test results are shown below:
Positive Motion Control Card
For the Positive Motion Control Card, we used the ECI1408, which does not require additional programming.
The test results are shown below:
Conclusion
From the above test results, we can draw the following conclusions:
1. Due to the different handling methods of Modbus TCP by different devices, the final communication speed varies, but the average cycle is within 10ms, which is the time for a single interaction.
2. The communication with the host computer is very stable, with no failures in continuous millions of interactions.
3. The time taken to read one register is not much different from the time taken to read 100 registers. In host computer development, it is advisable to use batch reading methods as much as possible.
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