Problem with modbus TCP server and client in Axc 1152 controller

PLCnext Engineer
1 
I am using modbus_tcp_10 library in Axc 1152 (FW version : 2021.6.0). I am facing the problem with modbus TCP server and client. Used modbus client for 5 times to read from 5 devices. If I connect any device while plc is running it is unable to connect to the device. Giving continuous error. I am restarting the client block based on error. If i stop and wa start the contoller then it will start reading the data from device.
With the Modbus server, I am using more than 10servers with all different port numbers (not used 502 port number). The server will responce to client. For all of a sudden it is stoping giving the response. If i restart the server function block then it will show server socket is open (in diag code shows 16#8100). But, unable to connect to the server. After the controller restart only able connect with the server. I did same kind of program in ILC 171 eth 2tx, it is working fine without any trouble, I never faced this kind of problem in ILC series controllers.

Please help me to solve the problem.
2

https://drive.google.com/drive/folders/1-aEVHf6WHB1syvYi9Ld1e2PUCe40tjvr?usp=sharing

for testing i just unflugged the PLC ethernet cable and connected back. but, modbus tcp client unable connect again to server .
please check the images attached in the link.
3

Hi,

I've checked the images and video carefully and made some tests with FW 2021.6,  several server instances, modbus poll (v7.x) and connect/disconnect several times. So far I've encountered no error.
[url="https://phoenixcontact-my.sharepoint.com/:i:/p/pywf02_europe/EVHZ9UVN1OBImkYB_8Nb0o4BIy7LW8qLhLVMddKMfv0-BQ?email=adapamjayachandra%40gmail.com&e;=NTpnb9"]https://phoenixcontact-my.sharepoint.com/:i:/p/pywf02_europe/EVHZ9UVN1OBImkYB_8Nb0o4BIy7LW8qLhLVMddKMfv0-BQ?email=adapamjayachandra%40gmail.com&e;=NTpnb9[/url]

It seems in your case that the connect request a) does not reach the PLC or b) is not seen from the functionblock.
Interesting also, that a warm restart seems to resolve the issue.

Can you create a tcpdump (kind of wireshark) from this situation?
https://pxc1.esc-eu-central-1.empolisservices.com/gatekeeper/guesttoken/45?app=/service-express/portal/cb?redirect=https://pxc1.esc-eu-central-1.empolisservices.com/service-express/portal/object/esc/en-so-46e09af5-2051-4aa3-9aa9-0aa6df00a84f?context=%7B%22filter%22%3A%7B%7D%2C%22text%22%3A%22tcpdump+PLCnext%22%2C%22useExpertQuery%22%3A0%7D

Frank
4

Hi,

Mr. Chethan pranjale (phoenix contact india team) has suggested to use the Modbus_tcp_9 library. I am using that library in the program. Now, i am not facing any issues.

Thanks for the responce.