252 Rockwell Automation Publication 2080-UM002M-EN-E - April 2022
Appendix A Modbus Mapping for Micro800
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 800 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 800 HMI (PV800),
there are three items that must be checked or modified in order to set up
communications from PV800 to Micro800.
USINT Y 8 Y 8
INT Y 16 Y 16 Y 1 Y 1
UINT Y 16 Y 16 Y 1 Y 1
WORD Y16 Y16 Y1 Y1
REAL Y32 Y32 Y2 Y2
DINT Y32 Y32 Y2 Y2
UDINT Y 32 Y 32 Y 2 Y 2
DWORD Y 32 Y 32 Y 2 Y 2
LWORD Y 64 Y 64 Y 4 Y 4
ULINT Y 64 Y 64 Y 4 Y 4
LINT Y64 Y64 Y4 Y4
LREAL Y 64 Y 64 Y 4 Y 4
Table 51 - Mapping Table (Continued)
Variable Data Type
0 - Coils
000001…065536
1 - Discrete Inputs
100001…165536
3 - Input Registers
300001…365536
4 - Holding Registers
400001…465536
Supported
Modbus Address
Used
Supported
Modbus Address
Used
Supported
Modbus Address
Used
Supported
Modbus Address
Used
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