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  1. Rob H
  2. PLCnext Technology & PLCnext Controls
  3. Thursday, 09 January 2020

I am struggling with maintaining a stable connection with the Modbus TCP server using the Modbus_TCP_6 library. This is running on an AXC F 2152 FW 2019.9. I am testing it with 3 devices (each one separately, not at the same time): a Proface HMI, vision software using ASCOM, and vision software using Kepware. With all 3 devices, a successful connection is established, but it eventually throws an error 16#C205 - Only one use of an address is normally permitted. Any ideas what is causing this error?

Automation Engineer - Grand Rapids, MI, USA

Rob H Accepted Answer Pending Moderation

I need to do a better job reading the manual... With the regards to the tTimeout parameter for the MB_TCP_Server FB, the manual states:

"Timeout monitoring when there is a write access. After a write function
was executed, a write telegram must be received again within the time
specified here. A timeout error is reported if this is not the case. Specify
the timeout value T#0s to disable this function."


That fixed it. 

Automation Engineer - Grand Rapids, MI, USA

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