plc-vfd modbus communication

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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