Smartlogger 3000 : Modbus TCP with a Phoenix Contact PLC

Dear,

I’m trying to read out and change the active and reactive power of the inverters in my power plant :

• 1x smartlogger 3000

• 5x SUN2000-110KTL

• 5x SUN2000-36kTL

Inverters to Smartloger : RS485

Smartlogger to PC / PLC : modbus TCP

I connected the smartlogger to my laptop and ran a modbus client software.

I can connect to the smartlogger, but :

• at first : I didn’t get any respons from the smartlogger on the request from my modbus client. I changed the Modbus setting to 'logical address' and now I have communication.

• The problem I encounter now is 'Illegal Data Value' :

  • I  put register '40420' (active energy)

  • Function 03 (read holding register)

  • Unsigned 32-bit big-endian
    

Once the communication with the test client works, I can move forward to the communication with a third party controller (Phoenix Contact AXC F2152 – Programmable Logic Controller).

This PLC will actively write the desired values for the active and reactive power of the plant to the smartlogger.