plc-vfd modbus communication
Post on 24-May-2015
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PLC –VFD MODBUS Communication (ASCII)
Delta 14 SS PLC & Delta VFD M Series
What is MODBUS?
• MODBUS is the serial communication between various devices.
• It Read/Write the memory addresses directly
ASCII ModeBaud Rate: 9600
Parity: EvenData Length: 7
Stop Bit: 1
MODBUS Wiring Diagram
• MODBUS is the serial communication between various devices.
• It Read/Write the memory addresses directly
ASCII ModeBaud Rate: 9600
Parity: EvenData Length: 7
Stop Bit: 1
Configuring VFD with Communication Parameters
ASCII Mode Parity: EvenData Length: 7Stop Bit: 1
Source of Frequency Command : RS 485 (Pr. 00 - 3)Source of Operation Command : RS 485 (Pr. 01 - 3)
(Parameter 92 – 01)
Baud Rate: 9600 (Parameter 89 – 01)
1 0 0 0 0 1 1 0
b7 b6 b5 b4 b3 b2 b1 b0
B0 – Data Length0 = 71 = 8
B2-b1 : Parity0 0 = None0 1 = ODD1 1 = EVEN
B3 – Stop Bit0 = 1 bit1 = 2 bit
0 0 0 1 110
0 0 1 0 150
0 0 1 1 300
0 1 0 0 600
0 1 0 1 1200
0 1 1 0 2400
0 1 1 1 4800
1 0 0 0 9600
b7 b6 b5 b4
1 0 0 1 19200
1 0 1 0 38400
1 0 1 1 57600
1 1 0 0 115200
b7 b6 b5 b4
Configuring PLC with Communication Parameters
Configuring PLC with Communication Parameters
It is used to hold the communication even if the value in D1120 changed
Used to set time out value where K100 = 100 Ms.
M1143 = ON (RTU Mode)M1143 = OFF (ASCII Mode)
Configuring PLC with Communication Parameters
Data sending request
Logic for Generating Pulses
M1129 = Data Receiving Time Out Bit
M1140 = Data Received Error
M1127 = Data Receiving Complete
Configuring PLC with Communication Parameters
MODRW –Operation Control Command
MODWR = Writing value to VFD Memory register
Device AddressData Address
Data Value
0 0 0 0 0 1 K1 Stop
0 0 0 0 1 0 k2 RUN
0 0 0 0 1 1 k3 JOG
0 1 0 0 0 0 k16 FWD
1 0 0 0 0 0 K32 REV
1 1 0 0 0 0 k48 Toggle Direction
0 1 0 0 1 0 k18 FWD RUN
1 0 0 0 1 0 K34 REV RUN
b5 b4 b3 b2 b1 b0 D Function
MODRW – Frequency Control Command
MODWR = Writing value to VFD Memory register
Device AddressData Address
Data Value
H2001 = Frequency Command K1 = 0.01 HzK5000 = 50 Hz
MODRD – Feedback from Drive CommandFrequency
OutputFrequency
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