PLC-VFD Modbus Communication
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Transcript of PLC-VFD Modbus Communication
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PLC –VFD MODBUS Communication (ASCII)
Delta 14 SS PLC & Delta VFD M Series
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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
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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
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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)
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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
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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)
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Configuring PLC with Communication Parameters
Data sending request
Logic for Generating Pulses
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M1129 = Data Receiving Time Out Bit
M1140 = Data Received Error
M1127 = Data Receiving Complete
Configuring PLC with Communication Parameters
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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
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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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