Hi,

We have a question concerning the performance of the OpenModbus communication to a Schneider Premium TSX75252 with a ethernet module ETY410

We have developed a Modbus/TCP driver and during test we determine relativly low performance in communication.

How is the response time to a Modbus requests determined? Does it depend on the cycle time of the PLC?

If we wait for the response to each request we got approximately 50 requests/sec.

We can improve the situation by sending several request in advance before waiting the response, but we do not find a specified number of requests
the PLC can buffer. If we go too high with the number of requests in advance we got errors.

Are there any other possibilities to improve the data through put?

thanks in advance

Andreas

 

Firstable you must use ETY4102 module because it is more efficient and fast. This module can support up to 450 requests/sec
These requests are always procesed by the CPU and depending on the CPU model you can process between 12 up to 48 requests per scan. (you can see that in the manual)

You can download a demo of our ActiveX Modbus TPC Client and test with it your application in "http://www.automationcorner.com":http://www.automationcorner.com

Regards