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Modbus TCP/IP Slave Configuration

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       I am need help with my application,  

The controller is USP-104-B10 in may application i am using the Modbus TCP/IP to connect PLC with Scada System... in the computer i am using a software Modbus/OPC when i inserte the fists 255 register everything is ok but more than that i cant read any register

Somebody can help me?


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  • MVP 2023

Do I understand you correctly that you are trying to read 255 registers at once via MODBUS? I believe there is a limit to how many registers you can read with a single Read Holding Registers command (a MODBUS limit, not Unitronics). Try breaking it up into multiple reads.

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