The limitation of the Modbus TCP IO Scanner of a TM251MESE are:
- maximum 64 channels divided between maximum 64 slaves.
Each channel has the following limitations:
- for Read/Write Holding Registers the maximum length is 125 read words  and 121 write words
- for Read Holding Registers the maximum length is 125 words
- for Write Multiple Registers the maximum length is 123 words

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