TECO 7300PA User Manual

7300PA Modbus

Application Manual

TECO Frequency Inverter

7300PA MODBUS Slave

Communication Interface

APPLICATION MANUAL

7300PA Modbus

Application Manual

Content

1. INTRODUCTION.................................................................................................................2

2. SPECIFICATION.................................................................................................................2

3. WIRING DIAGRAM.............................................................................................................3

4. INSTALLATION...................................................................................................................3

5. DESCRIPTION OF TERMINAL, LED, DIP SWITCH AND JUMPER..................................4

6. RELATED PARAMETERS FOR MODBUS COMMUNICATION.........................................5

7. CONNECTING INVERTER WITH HOST CONTROLLER...................................................6

8. PROTOCOL FORMAT ........................................................................................................7

9. MESSAGE FORMAT...........................................................................................................9

10. HOLDING REGISTER TAG LIST......................................................................................13

11. ERROR CODE..................................................................................................................24

12. EXAMPLE OF RS-485 COMMUNICA TION APPLICATION .............................................25

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1. Introduction This manual describes freature of PA-M communication card and the communication methods between TECO frequency inverter 7300PA and host controllers (PC, PLC…) using PA-M.

2. Specification

Part No. 4H300D2950006 Serial Interface RS-422/RS-485 Maximum Connection 32 MODBUS (RTU mode) salve standard Baud Rate 2400/4800/9600/19200 (BPS) Data Bit 8 Bit Parity No Parity/Odd Parity /Even Parity Stop Bit 1 Bit (Odd Parity, Even Parity)/2 Bit (No Parity)

Transmission

Distance (max.) 100m Mode Half-Duplex Connection Medium Shielded Twisted Pair Cable RTS Repeater TTL Level Photocoupler Isolation Common Mode Rejection VCM = 50V, dV/dt = 5000V/µsec Error Check Cyclic Redundancy Check (CRC) Access Data All Parameters of 7300PA Terminal Resistors Onboard Switch Setting

Product Feature

Communication Status 2 LED Indication Mechanical Size 64mm x 87mm

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3. Wiring Diagram (1) RS-485 interface (Set JP1 to "RS-485")

7300 PA

2CN

(2) RS-422 interface (Set JP1 to "RS-422")

7300 PA

2CN

PA-M

JP1

CN1

PA-M

JP1

CN1

RS-485

220

RS-422

220

SW1-1

Ω

SW1-1

Ω

SW1-2

Ω

1 (S+) 2 (S

1(TX+)

2(TX

1(RX+)

2(RX

TB1

)

Twist Pair Cable

TB1

TB2

Twist Pair Cable

Host Link

4. Installation (1) Turn off the inverter. (2) Insert attached 2 locking

supports into the 7300PA control board.

(3) Mount the PA-M commu-

nication interface to the control board, with the holes in the right side aligned to the locking supports, and the connector CN1 aligned to 2CN of control board.

CN1 in PA-M

2CN in control

board

Locking Support

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RS-48

Application Manual

5. Description of Terminal, LED, DIP Switch and Jumper

Receive

(1) Terminal

Terminal

TB1

TB2

CN1

LED2LED1

Send

TB1 TB2E12 E34

Function

RS-485 RS-422 1S+ TX+ 2S

E Shield Shield 3 ------------------- RX+ 4 ------------------- RX

E ------------------- Shield

JP1

RS-485 RS-422

RS-422

1234

S+ S---

TX+ TX-RX+ RX

SW1

(2) LED

LED Description

Receive Flash while data are being received from PLC.

Send Flash while data are being sent from PLC.

(3) DIP Switch (ON : enable terminal resistor, OFF : disable terminal resistor)

DIP

Switch

SW1-1

Control terminal resistor between S+

RS-485 RS-422

and S-.

SW1-2 ----------------------------------

Description

Control terminal resistor between

TX+ and TX -.

Control terminal resistor between

RX+ and RX-.

(4) Jumper

Jumper Description RS-422 RS-422 Communication Interface. RS-485 RS-485 Communication Interface.

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6. Related parameters for MODBUS communication (1) Node address (*1)

Sn-23 = 1~31 Inverter Node Address (Default = 1)

(2) Baud rate (*1)

Sn-24 = 00 = 01 = 10 = 11

(3) Parity Check (*1)

Sn-24 = --00 No Parity (Default = --00) =

(4) Stopping Method while RS485 Communication Fault/Alarm.

Sn-08 = 00

= 10 = 11

01 Even Parity

= --10 Odd Parity

11 Reserved

= 01

2400 BPS 4800 BPS 9600 BPS 19200 BPS (Default = 11--)

Decelerating to stop by Bn-02 (Default = 00--) Coasting to stop Decelerating to stop by Bn-04 Continuous operation

(Can be stopped by STOP Key if Sn-05 =

(5) Time-out Check

Cn-31 = 00.0 s Don’t care = 0.1 - 25.5 Checked Error (Default = 01.0 s)

(6) Source of Run/Stop command and Frequency reference

---

Sn-08 = = = = (Default =

*1 The change will be effective in the next start time after turning off the inverter.

0 Frequency reference is from RS-485.

---

1 Frequency reference is from Operator or Terminal.

--0-

--1-

Run/Stop command is from RS-485. Run/Stop command is from Operator or Terminal.

11)

---

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7. Connecting inverter with host controller (1) Operation procedure

A. Turn on the inverter, set the related parameters and turn off the inverter. B. Turn on the inverter again. C. Connect inverter and host controller. D. Host controller sends communication message.

(2) Communication status indication of inverter

While Run/Stop command and/or Frequency reference is from RS-485 (Sn-08), and the inverter does not receive any message from host controller after power on 1 seconds, the inverter will display "Call" and flash. This message will disappear while inverter has received messages from host controller.

While Run/Stop command and/or Frequency reference is from RS-485 (Sn-08), the time-out detection is enabled (Cn-31 <> 0) and the inverter does not receive any message from host controller in time specified by Cn-31, the inverter will display "CPF21".

While Run/Stop command and/or Frequency reference is from RS-485 (Sn-08), the inverter receives any message with incorrect communication format. (Baud rate, parity, data bit and stop bit) the inverter will display "CPF22".

Bit 2, 3 of parameter Sn-08 will decide the display format and operation of “CPF21", “CPF22".

= 11

Decelerating to stop by Bn-02 (fault “CPF21”/“CPF22” light up) Coasting to stop (fault “CPF21”/“CPF22” light up) Decelerating to stop by Bn-04 (fault “CPF21”/“CPF22” light up) Continuous operation (alarm “CPF21"/"CPF22" flash)

Sn-08 = 00 = 01 = 10

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8. Protocol Format (1) A message of MODBUS RTU mode contains 4 parts: slave address, function code,

data and CRC-16 character. The interval between two messages needs 3.5 characters transferring time.

T1 T2 T3 T4

T1~T4 : 3.5 Characters transferring time at least

(2) Following is the data bit format for MODBUS RTU mode. (LSB will be sent first)

Even/Odd Parity Start 1 2 3 4 5 6 7 8 Parity Stop

No Parity Start 1 2 3 4 5 6 7 8 Stop Stop

(3) Slave Address

Parameter Sn-23 can set the node address of each inverter (1~31). Every slave stand can receive the message sent from host controller. Only the corresponding one returns the message to master. If the slave address of receiving message is 0, all slave stands will execute this

Slave

Address

LSB

Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9

Function

Code

Data

Character

CRC-16

Character

T1 T2 T3 T4

MSB Bit10

command and do not return the message to master. This message can only use for Register 0001H and 0002H.

(4) Function Code

Code Function Note

03H Read Data of Holding Register ------------------06H Write Data to Single Register the Slave Address can be 0 08H Loop Test ------------------10H Write Data to Holding Register the Slave Address can be 0

(5) Data Characters

Detail descriptions will be discussed in "Message Format" section (p.9-12) because it depends on the function code.

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(6) CRC-16 data

CRC-16 Generation Procedure. A. Load a 16-bit register with FFFFH. Call this the CRC register.

B. Exclusive OR the first 8-bit byte of the message with the low order byte of the 16-bit

CRC registers, putting the result in the CRC register.

C. Shift the CRC register one bit to the right (toward the LSB), zero filling the MSB.

Extract and examine the LSB.

D.If LSB is 0, repeat procedure C (another shift).

If LSB is 1, Exclusive OR the CRC register with the polynomial value A001H.

E. Repeat procedure C, D until eight shifts has been performed.

While this is done, a complete byte will have been processed.

F. Repeat procedure B-E to the following byte of the message until all bytes of the

message is processed. Now, the value of CRC register is the CRC-16 data.

G. When the CRC is placed into the message, it upper and lower bytes must be

swapped.

(7) Inverter return messages

A. Please refer to the “Message Format” in next page about inverter returning

messages for more detail descriptions.

B. It needs 5ms to return messages after inverter had received normal message from

host controller.

C. In next two cases, inverter does not return any message :

(a) There is any error detected in received data message (parity error, framing error,

overrun error or CRC-16 error).

(b) Slave Address character is different to parameter Sn-36 (Inverter Slave No.).

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9. Message Format 7300PA supports 4 MODBUS Function codes only.

Table 1 Message Length

Host Query Inverter Return

Function

Code

Function

Byte

(Min.)

Byte

(Max.)

Byte

(Min.)

Byte

(Max.) Data Read 03H Read Data from Holding Register 8 8 7 37 Data Write 06H Write Data to Single Holding Register 8 8 8 8

Loop Test 08H Loop Test 8 8 8 8

Data Write 10H Write Data to Holding Register 11 41 8 8

(1) Read Command : Read data of Holding Register

Host Query

Slave Address 01H Function Code 03H

Head Address

(*1)

Access Count

(*2)

CRC-16

High Byte 00H

Low Byte 01H

High Byte 00H

Low Byte 01H Low Byte D5H

Inverter Return (Normal)

Slave Address 01H

Function Code 03H

Data Byte Count 02H

Data Value

High Byte 00H

Low Byte 00H

CRC-16

Low Byte B8H

High Byte 44H

High Byte CAH

Inverter Return (Error Detected)

Slave Address 01H

80H + Function Code 83H

Error Code (*3) 03H

CRC-16

Low Byte 01H

High Byte 31H

*1 Refer to p.13-23 to see the holding register tag list. *2 Host controller can read 16 registers at most in each transferring message. *3 Refer to p.24 to see the error code.

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