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What is the maximum number of registers that can be read during a Modbus Request?

Issue:
 Modubus request is not going through. Returning error code.
Product Line:
Control Expert (Unity Pro) Communication Function blocks 
Environment:
Control Expert (Unity Pro) XL V13 
Cause:
The modbus request is trying to access too many registers at the same time.
 
Resolution:
The number of registers read during a modbus request must not exceed 100 registers.
This applies to using the IO scanner or using Function blocks such as MBP_MSTR.
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