PLC-VFD Modbus Communication

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This presentation shows step by step explanation of how to build communication between PLC & VFD using MODBUS

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PLC-VFD Modbus Communication

  1. 1. PLC – VFD MODBUS Communication (ASCII) Delta 14 SS PLC & Delta VFD M Series
  2. 2. What is MODBUS? • • MODBUS is the serial communication between various devices. It Read/Write the memory addresses directly ASCII Mode Baud Rate: 9600 Parity: Even Data Length: 7 Stop Bit: 1
  3. 3. MODBUS Wiring Diagram • • MODBUS is the serial communication between various devices. It Read/Write the memory addresses directly ASCII Mode Baud Rate: 9600 Parity: Even Data Length: 7 Stop Bit: 1
  4. 4. Configuring VFD with Communication Parameters ASCII Mode Parity: Even Data Length: 7 Stop Bit: 1 (Parameter 92 – 01) Baud Rate: 9600 (Parameter 89 – 01) Source of Frequency Command : RS 485 (Pr. 00 - 3) Source of Operation Command : RS 485 (Pr. 01 - 3)
  5. 5. Configuring PLC with Communication Parameters b7 b6 b5 b4 b3 b2 b1 b0 1 0 0 0 0 1 1 0 B0 – Data Length 0=7 1=8 b7 b6 b5 b4 0 0 0 1 110 1 0 0 1 19200 B2-b1 : Parity 0 0 = None 0 1 = ODD 1 1 = EVEN 0 0 1 0 150 1 0 1 0 38400 0 0 1 1 300 1 0 1 1 57600 0 1 0 0 600 1 1 0 0 115200 0 1 0 1 1200 0 1 1 0 2400 0 1 1 1 4800 1 0 0 0 9600 B3 – Stop Bit 0 = 1 bit 1 = 2 bit b7 b6 b5 b4
  6. 6. 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)
  7. 7. Configuring PLC with Communication Parameters Data sending request Logic for Generating Pulses
  8. 8. Configuring PLC with Communication Parameters M1129 = Data Receiving Time Out Bit M1140 = Data Received Error M1127 = Data Receiving Complete
  9. 9. MODRW – Operation Control Command MODWR = Writing value to VFD Memory register Data Address Device Address Data Value b5 b4 b3 b2 b1 b0 D Function 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
  10. 10. MODRW – Frequency Control Command MODWR = Writing value to VFD Memory register H2001 = Frequency Command K1 = 0.01 Hz K5000 = 50 Hz Data Address Device Address MODRD – Feedback from Drive Data Value Command Frequency Output Frequency
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