Modbus and MikroTik

RouterOS Beginner Basics
1

Hi,

I have mAP Lite connected to Ethernet device on ether1 and to PC on wlan1. The communication PC- Ethernet device is possible only by using Modbus protocol (driver) of OPC server, installed on the same PC.
I have faced two issues:

  1. Every 12 seconds approximately the connection is interrupted, and then in a second, is restored.
  2. Only system parameters are read by the OPC server (for example, Hostname, Port, IP address, etc.), but not holding registers.
    Any ideas how these problems can be solved?
2

It is specific issue, indeed, but …anyone?

3

No reason to think your OPC server or even your plc could be the problem based on the description.

4

First verify logs on mAP lite … could be that wireless disconnects PC due to some reason (there are many possible reasons, log might give a clue).

5

Problem solved. No connection interruptions, all data read properly by OPC server now. I changed the port number in the server configuration to 502. The funny thing is I have more than year running project where all connections are ethernet, no WIFI, and I use different port - 20256 with no issues. At the same time port 502 was not working there. Obviously MikroTik wanted port 502…