Modbus TCp Slave Codesys in EPIC/RIO

[TheStig]

G’day,
has anyone had any luck in using the Codesys runtime modbus slave with an EPIC or RIO? I have a running project with declared variables at addresses but i can’t seem to get the register values in or out. I have disabled the MMAP so that doesnt interfere but it didnt seem to make a difference. I saw something around port 8502 but that isnt an option in most control scenarios so i need a way to get port 502 working with the codesys addressing on modbus.

Cheers

[Beno]

Hi Daniel. Welcome to the Opto22 Forums! (Love your chosen username!!)

Did you see this post?

Groov EPIC and RIO firewall tips

Just a few tips regarding the groov family firewall. (Feel free to add your own as time goes by). Since both EPIC and RIO run Linux, you can not open a port lower than 1024. The reasons for not less than 1024 are steeped history but generally revolve around the fact that when you talk to a service below 1024 you are talking to a secure service and thus you know its an elevated privilege service and the Linux user that runs groov Manage does not have root (superuser privileges) permission. N…

The fun part will be, and @greichert might have some ideas, how to skip the Node-RED part and or blend the Node-RED port trick with Codesys to make port 502 an option.