M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
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Serial Interface (Modbus RTU)<br />
Data Storage with Modbus<br />
The information is stored in one input and one holding register.<br />
Register Numbers Type Name<br />
30001–39999 Read only (ro = read only) Input-register<br />
40001–49999 Read/write (rw = Read/write) Holding register<br />
The registers are the memory location of the data. The memory size of each register is<br />
1 word.<br />
Modbus-Register-Mapping<br />
The register mapping enables the processing in MMX of the content listed in the following<br />
table via Modbus RTU.<br />
Group Register Numbers ID Range Assignment of the ID Numbers<br />
Display values 40001–40098 (30001–30098) 1...98 Parameter list: (see “Appendix A” starting on<br />
Page 140)<br />
Failure code 40099 (30099) 99 Error list: (see “Error and Warning Messages” starting<br />
on Page 54)<br />
Parameters 40101–40999 (30101–30999) 101...1999 Parameter list: (see “Appendix A” starting on<br />
Page 140)<br />
Input process data 42001–42099 (32001–32099) 2001...2099 (See Page 135)<br />
Output process data 42101–42199 (32101–32199) 2101...2199 (See Page 136)<br />
Each content in this table is assigned an ID number (abbreviation of the register numbers).<br />
This ID number is used in M-Max for the communication with Modbus RTU.<br />
Example: Control word (ID 2001)<br />
ID Register Numbers<br />
Value<br />
2001 32001/42001<br />
Application Communication of Modbus RTU Memory location of the data<br />
With some PLC manufacturers, the interface driver for Modbus RTU communication may<br />
contain an offset of +1 (the ID to be used would then be 2000 instead of 2001).<br />
When processing values, the comma is not included, for example, the motor current (ID 2106)<br />
in the display of the MMX is shown as 0.35 A but is transferred via Modbus as 0023 (hex)<br />
(0035 [dec]).<br />
134 M-Max <strong>Series</strong> <strong>Adjustable</strong> <strong>Frequency</strong> <strong>Drive</strong> MN04020003E—April 2011 www.eaton.com