Rockwell Automation Publication 5069-UM003A-EN-P - May 2018 61
Configure Compact 5000 I/O Serial Module Chapter 4
Data Index
This value indicates the offset of the register type address in the controller tags
that allows the serial module to read or write the required data to or from the
controller.
Each register type has a predefined array size it can be used for the Modbus
Slave as indicated in the Modbus Slave Address Table Limits
. For example, a
Holding register has the limit of 100 INT. The array size is 0…99 and the Data
index is 0…99 when the Holding register is used depending on the size and the
location where you want to store the information.
If you exceed the data limit an error may occur. This error would appear like
Figure 11
.
Figure 11 - Data Index Error
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