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Appendix E Modbus Mapping for Micro800
Variable Data Type
0 - Coils
000001 to 065536
Supported
WORD
Y
REAL
Y
DINT
Y
UDINT
Y
DWORD
Y
LWORD
Y
ULINT
Y
LINT
Y
LREAL
Y
190
1 - Discrete Inputs
100001 to 165536
Modbus
Supported
Modbus
Address Used
Address Used
16
Y
32
Y
32
Y
32
Y
32
Y
64
Y
64
Y
64
Y
64
Y
NOTE: Strings are not supported.
In order to make it easier to map variables to five-digit Modbus addresses, the
Connected Components Workbench mapping tool checks the number of
characters entered for the Modbus Address. If only five-digits are entered, the
address is treated as a five-digit Modbus address. This means that the Coils are
mapped from 00001...09999, Discrete Inputs are mapped from 10001...19999,
Input Registers are mapped from 30001...39999, and Holding Registers are
mapping from 40001...49999.
Example 1, PanelView Component HMI (Master) to Micro800
(Slave)
The embedded serial port is targeted for use with HMIs using Modbus RTU. The
maximum recommended cable distance is 3 meters. Use the 2080-SERIALISOL
serial port plug-in module if longer distances or more noise immunity is needed.
The HMI is typically configured for Master and the Micro800 embedded serial
port is configured for Slave.
From the default Communications Settings for a PanelView Component HMI
(PVC), there are three items that must be checked or modified in order to set up
communications from PVC to Micro800.
3 - Input Registers
300001 to 365536
Supported
Modbus
Address Used
16
Y
32
Y
32
Y
32
Y
32
Y
64
Y
64
Y
64
Y
64
Y
Rockwell Automation Publication 2080-UM005E-EN-E - March 2018
4 - Holding Registers
400001 to 465536
Supported
Modbus
Address Used
1
Y
1
2
Y
2
2
Y
2
2
Y
2
2
Y
2
4
Y
4
4
Y
4
4
Y
4
4
Y
4
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