Modbus data size is exceeded
The configuration of the Modbus Master commands in the
Channel
view exceeded the connection memory. The command configuration is subject to available connection memory. Limitations of the Master commands include:X
- Modbus Master- Each Modbus Master supports up to two data connections.
- Each data connection supports a maximum of 446 bytes of read data and 482 bytes of write data. For a second connection, the connection supports a maximum of 450 bytes of read data.
- Each command can have a maximum of either 125 words read or 123 words write or 2,000 coils/discrete input read or 1,968 coils written.
- Each command uses:
- Two bytes of input data per holding register or input register read.
- One byte of input data per every 1...8 coils or discrete inputs read.
- Two bytes of output data per holding register written.
- One byte of output data per every 1...8 coils written.
Check the configuration of the Master commands and make the necessary changes to reduce the size of the data.
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