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Publication 1766-RM001A-EN-P - October 2008
Protocol Configuration
619
Modbus Commands
The controller configured for Modbus RTU Slave responds to the Modbus
command function codes listed in below:
40257…40512
Read/Write Modbus Holding Register space (2nd Holding Register file).
3, 6, 16
40513…40768
Read/Write Modbus Holding Register space (3rd Holding Register file).
3, 6, 16
40769…41024
Read/Write Modbus Holding Register space (4th Holding Register file).
3, 6, 16
41025…41280
Read/Write Modbus Holding Register space (5th Holding Register file).
3, 6, 16
41501…41566
Read/Write System Status File
3, 6, 16
41793…42048
Read/Write Modbus Holding Register space (6th Holding Register file).
3, 6, 16
Modbus Slave to MicroLogix Memory Map - Detail
Modbus Addressing
Modbus Address Reference
Modbus Function Code (decimal)
Supported Modbus Commands as a Modbus RTU Slave
Command
Function Code
(decimal)
Subfunction Code
(decimal)
Read Coil Status
1
-
Read Input Status
2
-
Read Holding Registers
3
-
Read Input Registers
4
-
Write Single Coil
(1)
(1) Broadcast is supported for this command.
5
-
Write Single Holding Register
6
-
Echo Command Data
8
0
Clear Diagnostic Counters
8
10
Write Multiple Coils
15
-
Write Multiple Holding Registers
16
-
Supported Modbus Commands as a Modbus RTU Master
Command
Function Code
(decimal)
Subfunction Code
(decimal)
Read Coil Status
1
-
Read Input Status
2
-
Read Holding Registers
3
-
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