PLC MicroLogix 1100 is a small PLC of Allen Bradley but fully equipped with communication ports such as Ethernet, RS232, RS485. And of course it also supports the Modbus RTU communication
Today plc247.com will guide you to use MicroLogix 1100 to control Danfoss FC302 inverter (also integrated RS485 port).
MicroLogix 1100 & Danfoss FC302 “Wiring Diagram”
Danfoss FC302 Modbus RTU Configuration
In addition to the basic parameters of the inverter, we need to set the communication parameters as shown in the table below to be able to control Danfoss FC302 with Modbus RTU
FC302 Registers Address
Note: MicroLogix 1100 Address = “VFD Address (Dec) + 1“
>>> VFD Control Address = 49999 + 1 = 50000
- Set Word 50000 = 1148 (dec) >>> Run Forward
= 33916 (dec) >>> Run Reverse - Set Word 50000 = 1084 (dec) >>> Stop
- Set Word 50000 = 1212 (dec) >>> VFD Reset
>>> VFD Speed Setting Address = 50009 + 1 = 50010
Setting Reference = 0 to 16384(dec) ~ (0 to 100%)
>>> Output Voltage Address = 16120
>>> Output Frequency Address = 16130
>>> Output Current Address = 16140
>>> Output Speed Address = 16170
MicroLogix PLC Modbus-RTU Setting
We need to set the communication parameters of the PLC to be the same as those installed in the Danfoss FC302 VFD
MicroLogix Modbus RTU Programming
+ Read / Write Auto Distribution
+ VFD Control Command
+ VFD Speed Setting Command
+ VFD Read Data Response
Detailed Instruction Video
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Required software and documentation
+ MicroLogix Modbus RTU Manual PDF Download
+ Danfoss FC302 Manual PDF Download
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Best Regards!
Can I apply the same logic for controlling multiple frequency inverters connected in a Daisy Chain topology?Could you assist me with this?
only need change slaves address sir