A-5 Modbus TCP
AC30V series Variable Speed Drive
User-Defined Parameter Mapping
The AC30 parameters may be mapped to the user-defined register area (00001 – 00256). This allows parameters to be grouped together so that
they may be accessed through a single Modbus request.
To map parameters add the required parameter numbers to the user mapping table using parameter 1567 Modbus Mapping. The following
applies:
• The mapping starts at register 00001.
• Any valid fixed or application parameter may be added excluding password parameters and parameter arrays - individual elements of the
array may be added however.
• Parameter strings may be added.
• The mapping ends on the first mapping entry of zero or when the mapping table is full.
Note: The mapping may be modified at any time. However no Modbus requests should be made when the mapping is being modified to avoid
indeterminate response data.
Unlike the fixed mapping, the user-defined parameter mapping will only use as many registers as necessary to accommodate the parameter. An
example is given below:
Parameter Name Data Type No. of Registers Start Register End Register
0 0627 Comms Control Word WORD 1 00001 00001
1 0681 Comms Reference REAL 2 00002 00003
2 0696 First Trip USINT 1 00004 00004
3 0661 Status Word WORD 1 00005 00005
4 0395 Actual Speed Percent REAL 2 00006 00007
5 0961 Drive Name 23-character STRING
12 00008 00019
6 0000
The mapping table is continually checked for valid entries. The diagnostic parameter 1632 Mapping Valid will be TRUE if all entries in the table
are valid parameters. If the diagnostic parameter is FALSE, meaning there are invalid entries, then Modbus requests are still accepted but the
invalid entries will be skipped over and will occupy no registers in the mapping.
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