Thytronic NA60-MB0 PRON Series, N60-MB2 PRON Series, PRON NA60-MB2, PRON NA60-MB0 User Manual

MODBUS PROTOCOL USER GUIDE 3.50

Modbus Communication Protocol User Guide

PRON NA60-MB0

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Contents

Contents ........................................................................................................................................................................2

1 Modbus RTU communication................................................................................................................................3

1.1

Serial port settings........................................................................................................................................3

1.2

Transmission mode......................................................................................................................................3

1.3

Data Types...................................................................................................................................................3

1.4

Supported functions .....................................................................................................................................4

1.5

Exceptions....................................................................................................................................................4

1.6

Modbus/TCP ................................................................................................................................................5

1.7

Network setting.............................................................................................................................................5

1.8

NTP synchronization ....................................................................................................................................5

2 Logical organization of the protection’s data ........................................................................................................6

2.1

Basic Data Type...........................................................................................................................................6

2.1.1 BIT............................................................................................................................................................6

2.1.2 BYTE........................................................................................................................................................7

2.1.3 UBYTE.....................................................................................................................................................7

2.1.4 WORD......................................................................................................................................................8

2.1.5 UWORD...................................................................................................................................................8

2.1.6 LONG.......................................................................................................................................................9

2.1.7 ULONG ....................................................................................................................................................9

2.1.8 ARR........................................................................................................................................................10

2.1.9 STR........................................................................................................................................................11

2.1.10 CMD.......................................................................................................................................................11

3 How to read the Address Data Table..................................................................................................................12

3.1

Address Data Table....................................................................................................................................12

3.1.1 VAR........................................................................................................................................................12

3.1.2 REF........................................................................................................................................................12

3.1.3 IDX.........................................................................................................................................................12

3.1.4 DIM.........................................................................................................................................................13

3.1.5 TYPE......................................................................................................................................................13

3.1.6 UM..........................................................................................................................................................13

3.1.7 Kv 13

3.1.8 ENUM.....................................................................................................................................................14

3.2

Common properties....................................................................................................................................14

3.2.1 Input state ..............................................................................................................................................14

3.2.2 Output state............................................................................................................................................14

4 Examples ............................................................................................................................................................15

4.1

Example 1. How to read a variable............................................................................................................15

4.2

Example 2. How to read a BIT data type ...................................................................................................16

4.3

Example 3. How to execute a command....................................................................................................16

5 Glossary..............................................................................................................................................................17

6 Appendix A. Address Data Table........................................................................................................................18

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Introduction

This Protocol Manual is for use with Thytronic Protective Relays, such as the DMC, NTG and PRO-N series that support Modbus RTU and Modbus TCP communication protocol.

1 Modbus RTU communication

The Thytronic Protective Relay (TPR) uses a communication protocol called Modbus. A company called Modicon, for use with their programmable controllers, developed the Modbus protocol. Since that time Modbus has evolved into common communication protocol in industry and it’s now a “de-facto” standard. The communication method involves using a master-slave technique, in which there is one master and several slaves. The TPR is a slave device. Only the master can initiate queries. These queries are directed to an individual slave device and the appropriate slave responds with the requested data. There are two transmission modes. These modes are known as RTU (Remote Terminal Unit) and ASCII (American Standard Code for Information Interchange). The TPR can be setup in a network of up to 247 slave devices. Each device must have a different address (1-247). The TPR can be set for RTU mode only.



The MODBUS protocol documentation can be found online at www.modicon.com or www.modbus.org

(document “PDI-MBUS-300 REV J”).

1.1 Serial port settings

To communicate with a TPR, the serial port of the Master has to be configured with the following settings:

Address Baud Rate Parity Stop bits Data bits

1 19200 No 1 8

Table 1 Serial port settings

Remark: Every TPR has a default MODBUS Slave Address set to 1.

1.2 Transmission mode

The transmission mode supported by TPR is RTU. The ASCII transmission mode is not supported.

1.3 Data Types

A TPR has 4 data table, each of which corresponds to one of the 4 basic Modbus data type. Each table contains up to 1024 data that can be accessed with the proper function as described in the following table.

table/data type reference information Access Function Code for

Reading

Coils 0X 1 bit Read/Write 0x01 0x05 Discrete Inputs 1X 1 bit Read only 0x02 Input Registers 3X 16 bit Word Read only 0x04 Holding Registers 4X 16 bit Word Read/Write 0x03 0x06, 0x10

Table 2. Modbus Data Type

Function Code for

Writing

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1.4 Supported functions

TPR supports the following Modbus functions:

Code Name

0x01 0x02 0x03 0x04 0x05 0x06 0x0F 0x10

Table 3 Supported Modbus functions

The smallest data that can be exchanged within a Modbus message is the Modbus Register. A Modbus Register is a 16 bit data in the Big Endian representation, called WORD (W)

Read Coil Status Read Input Status Read Holding Registers Read Input Registers Force Single Coil Preset Single Register Force Multiple Coil Preset Multiple Registers

W = BH BL

1.5 Exceptions

When a TPR receives a request that can not handle (e.g. the data address doesn’t exists, the function is not supported, etc.), a special response called Exception is returned to the Master. This message contains the information needed to recognize the error occurred.

In an Exception message the most significant bit (msb) of the Function field is set to 1.

• Function Code field: in case of exception, the msb is set to 1.

• Data field: this field contains a value related to the kind of error generated by the request.

An example of request with exception response could be the following:

04 07 A5 50 00 02 - -

S F ADR DIM CRC

04 87 01 - -

S F DATA CRC

S = Slave Address F = Function Code ADR = Modbus Data Address DIM = Dimension (number of registers) DATA = data value CRC = Cyclical Redundancy Code

In this example the function code 07 is not supported by the TPR. The response is an exception message (the msb of function code F=0x87 is set to 1). The Data field value is 1 and according with the Modbus standard corresponds to the “Illegal function” exception.

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Identifier

The next table describes all the exceptions handled by the TPRs.

Code

01 ILLEGAL FUNCTION 02 ILLEGAL DATA ADDRESS 03 ILLEGAL DATA VALUE 04 SLAVE DEVICE FAILURE

05 ACKNOWLEDGE

06 SLAVE DEVICE BUSY

1.6 Modbus/TCP

Modbus/TCP, an extension of Modbus/RTU, defines how Modbus/RTU and Modbus/ASCII messages are encoded within and transported over TCP/IP-based networks. Modbus/TCP is just as simple to implement and flexible to apply as the original Modbus/RTU. The specification can be found online at www.modicon.com

Transaction

Name Description

The function code received in the query is not an allowable action for the slave. The data address received in the query is not an allowable address for the slave A value contained in the query data field is not an allowable value for the slave An unrecoverable error occurred while the slave was attempting to perform the requested action. The slave has accepted the request and is processing it, but a long duration of time will be required to do so. This response is returned to prevent a timeout error from occurring in the master. The slave is engaged in processing a long-duration program command. The master should retransmit the message later when the slave is free.

Protocol

Length Field Modbus Frame

CHECKSUM

TCP FRAME

MODBUS FRAME

S F DATA

1.7 Network setting

Every device connected to the TCP/IP network including the TPRs must have a unique IP address. Every TPR has the following default IP address:

Default IP Address = 200.1.1.135

1.8 NTP synchronization

To synchronize the Real Time Clock of more than one protection at the same time the NTP service is available. Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer systems over packet-switched, variable-latency data networks. NTP uses UDP port 123 as its transport layer. It is designed particularly to resist the effects of variable latency.

To synchronize all the TPR in a network is sufficient to send a broadcast NTP packet on the network.



The NTP service can be enabled/disabled changing the “NTP synchronization” parameter (Appendix A –

Address Data Table).

More information about the NTP protocol and service can be found online at www.ntp.org

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2 Logical organization of the protection’s data

Each TPR has some data that can be read and/or written. These data are grouped in 4 data table. Data with 1 bit of information (e.g. the state of an output), can be placed in the Discrete Inputs table or in the Coils table, while data with more than 1 bit of information (e.g. the value of a current), can be placed in the Register table, sometimes fitting more than one register as described in the following example.

Example: let’s read the value of the variable ”I> Start”. This variable is the first one in the Discrete Input data table. To read this kind of data the Modbus function 0x02 has to be used. As described in the standard the Modbus address to access the data is given by IDX-1 = 5 in this case. To read the data from the Slave address 1 the next request has to be sent:

1x, Discrete Input

n° var n° var

6 I> Start 157 Power frequeny 7 I> Trip 158 Phase current IL1 value – Word L 8 I> Block1 159 Phase current IL1 value – Word H

160 Phase current IL2 value – Word L 161 Phase current IL2 value – Word H

Table 4. Example of data structures

01 02 00 05 00 01 - -

S F ADR DIM CRC

3x, Input Registers

2.1 Basic Data Type

In this chapter all the basic TPR data type and their relationship with the Modbus data type will be described.

2.1.1 BIT

Description:

Variable with 1 bit of information. Relationship with Modbus:

The information corresponds to the least significant bit (lsb) of the first data byte addressed in the query.

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2.1.2 BYTE

Description:

Signed variable with 1 byte (8 bit) of information. Range: -128  +127 Relationship with Modbus:

A BYTE data type is always placed in the Least Significant Byte (LSB) of a Modbus Register (DIM=1).

B 00 B

Byte

Example:

relationship between the data BYTE whose value is 13 (0x0D) and its Modbus representation:

Byte

Modbus

0D 00 0D

Modbus

2.1.3 UBYTE

Description:

Unsigned variable with 1 byte (8 bit) of information. Range: 0  +255

Relationship with Modbus:

A BYTE data type is always placed in the Least Significant Byte (LSB) of a Modbus Register (DIM=1).

B 00 B

UByte

Example:

relationship between the data BYTE whose value is 13 (0x0D) and its Modbus representation:

0D 00 0D

Byte

Modbus

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2.1.4 WORD

Description:

Signed variable with 2 byte (16 bit) of information. Range: -32.768  +32.767

Relationship with Modbus:

A WORD data type is always placed in a Modbus Register (DIM=1) keeping the representation (Big Endian).

BH BL BH BL

Word

Example:

relationship between the data WORD whose value is 3073 (0x0C01) and its Modbus representation:

0C 01 0C 01

Word

Modbus

2.1.5 UWORD

Description:

Unsigned variable with 2 byte (16 bit) of information. Range: 0  +65.535

Relationship with Modbus:

A UWORD data type is always placed in a Modbus Register (DIM=1) keeping the representation (Big Endian).

BH BL BH BL

UWord

Example:

relationship between the data UWORD whose value is 3073 (0x0C01) and its Modbus representation:

0C 01 0C 01

UWord

Modbus

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2.1.6 LONG

Description:

Signed variable with 4 byte (32 bit) of information. Range: -2.147.483.648  +2.147.483.647

Relationship with Modbus:

A LONG data type is placed in two Modbus Registers (DIM=2). The Least Significant Word of the LONG data type is placed in the first Modbus register while the Most Significant Word of the LONG data type is placed in the second Modbus register.

BHH BHL BLH BLL BLH BLL B

WH WL WL WH

Long Modbus Registers

Example:

relationship between the data LONG 66536 (0x103E8) and its value in the Modbus protocol domain:

00 01 03 E8 03 E8 00 01

Long Modbus Registers

BHL

2.1.7 ULONG

Description:

Unsigned variable with 4 byte (32 bit) of information. Range: -0  +4.294.967.295

Relationship with Modbus:

A ULONG data type is placed in two Modbus Registers (DIM=2). The Least Significant Word of the ULONG data type is placed in the first Modbus register while the Most Significant Word is placed in the second Modbus register.

LHH LHL LLH LLL LLH LLL LHH LHL

WH WL WL WH

ULong Modbus Registers

Example:

relationship between the ULONG data whose value is 66536 (0x103E8) and its Modbus representation:

00 01 03 E8 03 E8 00 01

ULong Modbus Registers

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2.1.8 ARR

Description:

Array of BYTE.

Relationship with Modbus:

An ARR data type of length n is placed in N Modbus Registers (N= ceil(n/2) †) keeping the byte ordering. If odd n, the last byte of ARR is placed in the MSB of the last Modbus register, while the LSB is set to 0

If even n:

B1 B2 Bn B1 B2 B

1 2 n 1 N

Array[n] Modbus Registers

If odd n:

B1 B2 Bn B1 B2 Bn 0

1 2 n 1 N

Array[n] Modbus Registers

Example:

Let’s consider an array with 3 bytes whose values are: (0x01, 0x3A, 0x1F). This array can be placed in N=ceil(3/2)=ceil(1.5)=2 Modbus registers.

01 3A 1F 01 3A 1F 00

1 2 3 1 2

Array[3] Modbus Registers

n-1

N = ceil(n/2)

†

The ceil function returns the smallest integer value that is greater than or equal to a number. For example,

ceil(2.3)=3 , ceil(1.5)=2.

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2.1.9 STR

Description:

String data type. It’s represented by an array of BYTE. Every byte represents the hexadecimal ASCII code associated with the character of the string

Relationship with Modbus:

An STR data type of length n is placed in N Modbus Registers (N= ceil(n/2) †) keeping the byte ordering. If odd n, the last byte is placed in the MSB of the last Modbus register. A zero padding operation (with char ‘\0’) is necessary for every writing operation where the length of the string is lower than the number of bytes contained in the Modbus registers.

If even n:

C1 C2 Cn C1 C2 C

1 2 n 1 N

String[n] Modbus Registers

If odd n:

C1 C2 Cn C1 C2 Cn ‘\0’

1 2 n 1 N

String[n] Modbus Registers

Example:

Let’s assume “Relay reference name” is a STRING variable whose length is 8 characters, its Modbus address is 0x0029 and its dimension is 4 Modbus registers. Let’s set its value to “NAxx”.

First of all the ASCII code in hexadecimal notation for each character of the string “NA10” is equal to 0x4E417878 An example of write request could be the following:

01 10 00 29 00 05 10 4E 41 78 78 00 00 00 00 - -

S F ADR DIM B DATA1 DATA2 DATA3 DATA4 CRC

‘N’ ‘A’ ‘x’ ‘x’ ‘\0’ ‘\0’ ‘\0’ ‘\0’

Remark. A zero padding operation is necessary because the length of the string “DMC901” is lower than the length of the RACK_TYPE variable.

n-1

N = ceil(n/2)

2.1.10 CMD

Description:

This type of data represents a command. Every Command corresponds to a Coil data type. To execute the command, the value of the associated Coil has to

be set to 1 with the Modbus function 0x05.

†

The ceil function returns the smallest integer value that is greater than or equal to a number. For example,

ceil(2.3)=3 , ceil(1.5)=2.

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Table

. Address Data Table’s field

3 How to read the Address Data Table

All the information necessary to read/write data from/to a TPR is contained in the Address Data Table (see Appendix A).

3.1 Address Data Table

Now a description of all the Address Data Table’s fields is given:

3.1.1 VAR

The VAR field contains the description of the variable. An example of VAR fields could be: “Relay phase nominal current - In ”, “Relay reference name” or “I> Trip”.

VAR REF IDX DIM TYPE UM KV ENUM

3.1.2 REF

The REF field tells which data table the variable is stored in. The REF field can assume one of the following values:

• 0x: data stored in the COIL table

• 1x: data stored in the DISCRETE INPUT table

• 3x: data stored in the INPUT REGISTER table

• 4x: data stored in the HOLDING REGISTER table

3.1.3 IDX

The IDX field represents the position of the table (specified by REF) in which the variable VAR is stored. The IDX value is related to the Modbus address of the variable. The relationship between IDX and Modbus address is the following:

MB address = IDX - 1

Example: let’s consider the following Address Data Table

VAR REF IDX DIM

Relay phase nominal current - In Relay reference name I> Trip

Let’s see that the variable “Relay phase nominal current - In” is the 50th variable stored in the Input Registers table (reference 3x) and its dimension is 1 Modbus register (DIM=1).

3x 50 1 3x 42 8 1x 7 1

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3.1.4 DIM

The DIM field is the number of Modbus registers necessary to contain the VAR data. Example: let’s read the value of the variable “Relay phase nominal current - In ”.

From the previous table we see that the reference is 4x for which the function 0x03 has to be used for reading. The Modbus address is IDX-1=50-1=49. The request for reading is the following:

01 03 00 31 00 01 - -

S F ADR DIM CRC

3.1.5 TYPE

The TYPE field specifies the basic data type associated with VAR, as described in chapter 2.1.

3.1.6 UM

The UM field specifies the Unit of Measure of the variable. If UM is empty, it means that the Unit is just a number.

3.1.7 Kv

The Kv field contains the scale factor that has to be applied to the variable to obtain the real value. If Kv is not equal to 1, the value of the variable must be divided by Kv.

Example: let’s consider the following address data table

VAR REF IDX DIM TYPE UM KV ENUM

Phase current IL1 - Value 3x 159 2 LONG In 16000

Let’s read the “Phase current IL1 - Value “ from the Slave address 1.

01 04 00 9E 00 02 - -

S F ADR DIM CRC

Let’s assume the following response:

The TYPE field is necessary to decode the right value returned from the Modbus response, as described in chapter

2.1. The decoded value contained in the response is 0x0003A980 = 240000. Kv=16000 means that the value of the variable has to be divided by 16000. UM specify the Unit. The “Phase current IL1 – Value” is equal to 15 In.

01 04 04 A9 80 00 03 - -

S F B DATA1 DATA2 CRC

LONG

VALL VALH

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3.1.8 ENUM

The ENUM field, whenever is defined, contains the meaning of all possible values assumed by the variable.

3.2 Common properties

Some common properties are now described for a better understanding.

3.2.1 Input state

• State It’s the physical state of the Input: 0 or 1 (OFF or ON)

3.2.2 Output state

• State It’s the logical state of the output: 0 or 1 (OFF or ON); could not correspond with its physical state

• Fail

It’s the Coil Failure Status: 0 or 1 (OFF=”OK” o ON=”Fault”).

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4 Examples

For all the examples, the following symbols are assumed: S = Slave Modbus address (1-247)

F = Modbus Function code (1,2,3,4,5,6,15,16) B = number of byte in the DATA field ADR = Modbus DATA address DIM = number of Modbus DATA address CRC = Cyclical Redundancy Check DATAx = register x of DATA field VALx = value x of the variable

4.1 Example 1. How to read a variable

Let’s read from the Slave address 1 the value of the “Relay phase nominal current - In ”. From the Address Data Table (Appendix A) we find out the following information;

VAR REF IDX DIM TYPE UM Kv ENUM

Relay phase nominal current - In 3x 50 1 UWORD A 1

The REF field value specify an Input Register (3x), so the function 0x04 is used for reading. From the IDX the Modbus address is derived: Modbus address = IDX -1 = 50 - 1 = 49. DIM specify the number of register to be read.

The TYPE field value is equal to UWORD. Applying the rules described in the chapter 2.1, the following value is obtained

Il UM field specify the Unit of measure that is “Ampere”, while Kv = 1 means that the value doesn’t need to be scaled. The “Relay phase nominal current – In” is equal to 5A.

01 04 00 3E 00 02 - -

S F ADR DIM CRC

01 04 04 00 05 - -

S F B DATA CRC

VAL = 0x0005= 5.

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4.2 Example 2. How to read a BIT data type

Let’s read from the Slave address 1 the variable “I> Trip”. From the Address Data Table (Appendix A) we find out the following information;

VAR REF IDX DIM TYPE UM Kv ENUM

I> Trip 1x 7 1 BIT 0=OFF, 1=ON

The REF field value specify a Discrete Input (1x), so the function 0x02 is used for reading. From the IDX the Modbus address is derived: Modbus address = IDX -1 = 7 - 1 = 6. DIM specify the number of register to be read.

The TYPE field value is equal to BIT. Applying the rules described in the chapter 2.1, the following value is obtained

The ENUM field specifies the meaning of the value. In this case, the value 1 corresponds to the “ON” state and it means that a Trip has occurred on the first threshold of the 51 function.

01 02 00 06 00 01 - -

S F ADR DIM CRC

01 02 01 00 01 - -

S F B VAL CRC

VAL = 1.

4.3 Example 3. How to execute a command

Let’s execute the command “Reset events” on the Slave address 1. From the Address Data Table (Appendix A) we find out the following information;

VAR REF IDX DIM TYPE UM Kv ENUM

Reset LEDs 0x 2 1 CMD 0=OFF, 1=ON

The TYPE field value specifies a Command (CMD). As described in chapter 2.1, to execute the command, it is necessary to set its value to 1. The REF field value specify a Coil (0x), so the function 0x05 is used for writing. From the IDX the Modbus address is derived: Modbus address = IDX -1 = 2 - 1 = 1 The Response message is known as an “Acknowledge” because it’s an echo of the request, and it means that the Coil has been set:

01 05 00 01 FF 00 - -

S F ADR DATA CRC

01 05 00 01 FF 00 - -

S F ADR DATA CRC

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5 Glossary

BH Most significative Byte of a Word data (Higher byte) BL Least significative Byte of a Word data (Lower byte) LSB Least Significative Byte lsb least significative bit MSB Most Significative Byte msb Most significative bit NTP Network Time Protocol RTU Remote Terminal Unit TPR Thytronic Protective Relay WH Most significative Word of a Long data (Higher word) WL Least significative Word of a Long data (Lower word)

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6 Appendix A. Address Data Table

VAR REF IDX DIM TYPE Range Um Kv ENUM

Commands

Set RTC 0x 1 1 CMD 0=OFF, 1=ON Reset CB Open counter 0x 2 1 CMD 0=OFF, 1=ON Reset LEDs 0x 3 1 CMD 0=OFF, 1=ON Reset CB time action 0x 4 1 CMD 0=OFF, 1=ON Reset MTV 0x 5 1 CMD 0=OFF, 1=ON Reset Breaking currents SumI2t 0x 6 1 CMD 0=OFF, 1=ON Reset Breaking currents SumI 0x 7 1 CMD 0=OFF, 1=ON Reset partial counters 0x 8 1 CMD 0=OFF, 1=ON Thermal image presetting 0x 9 1 CMD 0=OFF, 1=ON Fault reading 0x 10 1 CMD 0=OFF, 1=ON Reset faults 0x 11 1 CMD 0=OFF, 1=ON Reset faults identifier 0x 12 1 CMD 0=OFF, 1=ON Events reading 0x 13 1 CMD 0=OFF, 1=ON Reset events 0x 14 1 CMD 0=OFF, 1=ON Reset event identifier 0x 15 1 CMD 0=OFF, 1=ON Open CB 0x 16 1 CMD 0=OFF, 1=ON Close CB 0x 17 1 CMD 0=OFF, 1=ON Test-off 0x 18 1 CMD 0=OFF, 1=ON Test-on 0x 19 1 CMD 0=OFF, 1=ON Reset on demand measures 0x 20 1 CMD 0=OFF, 1=ON Reset on energy measures 0x 21 1 CMD 0=OFF, 1=ON PLC2 Command - 1 0x 22 1 CMD 0=OFF, 1=ON PLC2 Command - 2 0x 23 1 CMD 0=OFF, 1=ON

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