Example 1, Panelview 800 Hmi (Master) To Micro800 (Slave) - Rockwell Automation Allen-Bradley Micro830 User Manual

Appendix A Modbus Mapping for Micro800
Table 64 - Mapping Table (Continued)
0 - Coils
000001...065536
Variable Data Type
Supported
ULINT Y
LINT Y
LREAL Y
262
1 - Discrete Inputs
100001...165536
Modbus Address Modbus Address
Supported
Used Used
64 Y 64
64 Y 64
64 Y 64
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.
1. Change from DF1 to Modbus protocol.
Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
3 - Input Registers 4 - Holding Registers
300001...365536 400001...465536
Modbus Address
Supported Supported
Used
Y 4 Y
Y 4 Y
Y 4 Y
Modbus Address
Used
4
4
4