Emerson Bettis XTE3000 User manual

Bettis XTE3000

Modbus RTU Module

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

October 2022

Notes

October 2022

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

Revision Details

Rev. Date Description Prepared Checked Approved

7 October 2022 Update Figure 15

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

Table of Contents

October 2022

Table of Contents

Section 1: Introduction

1.1 References .................................................................................................... 1

1.2 Modbus RTU or ASCII .................................................................................... 1

Section 2: Operation and Storage

Operation and Storage............................................................................................ 2

Section 3: Communication Features

Communication Features........................................................................................ 3

Section 4: Modbus RTU Module

4.1 On Board Indications and Jumpers................................................................. 5

Section 5: Modbus RTU Protocol Description

Modbus RTU Protocol Description........................................................................... 6

Section 6: Modbus Wirings

6.1 RS485 Transmission Mode ............................................................................ 7

Section 7: Modbus I/O List

7.1 Discrete Inputs............................................................................................ 10

7.2 Coils............................................................................................................ 11

7.3 Analog Inputs.............................................................................................. 13

7.4 Holding Registers........................................................................................ 20

Section 8: Modbus Function Description

8.1 Function Code 01 (0x01) Read Coils Status.................................................. 34

8.2 Function Code 16 (0x10) Write Multiple Registers ...................................... 35

8.3 Function Code 03 (0x03) Read Holding Registers ........................................ 36

8.4 Function Code 04 (0x04) Read Input Registers ............................................ 37

8.5 Function Code 05 (0x05) Write Single Coil .................................................. 38

8.6 Function Code 06 (0x06) Write Single Register............................................ 39

8.7 Function Code 08 (0x08) Diagnostic ........................................................... 40

8.7.1 Sub-Function 00 (0x0000) Return Query Data.................................. 40

8.7.2 Sub-Function 11 (0x000B) Return Bus Message Count...................... 40

8.7.3 Sub-Function 12 (0x000C) Return Bus Communication Error Count . 40

8.7.4 Sub-Function 13 (0x000D) Return Bus Exception Error Count ........... 41

8.7.5 Sub-Function 14 (0x000E) Return Slave Message Count ................... 41

8.7.6 Sub-Function 17 (0x0011) Return Slave Busy Count ......................... 41

8.7.7 Sub-Function 18 (0x0012) Return Bus Character Overrun Count ...... 41

8.8 Function Code 15 (0x0F) Write Multiple Coils.............................................. 42

8.9 Function Code 16 (0x10) Write Multiple Registers....................................... 43

8.10 Function Code 17 (0x11) Report Slave ID..................................................... 44

8.11 Exception Codes.......................................................................................... 45

Table of Contents

October 2022

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

Table of Contents

Section 9: Conguration via Local Interface of XTE3000

9.1 BUS Control................................................................................................. 46

9.2 Positioner Function ..................................................................................... 48

9.3 Fail Safe Function ........................................................................................ 49

9.4 Viewing Transmission Info........................................................................... 50

9.5 BUS Signal Failure Indication........................................................................ 50

9.6 Actuator Terminal Board ............................................................................. 51

Section 10: Annex A

10.1 Replacement of 494MOD1000 with 494MOD1200 ..................................... 52

Section 11: Annex B

11.1 Multiple Functionality of ESD Command and Status.................................... 54

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7 October 2022

Introduction 1

Section 1: Introduction

The XTE3000 Modbus RTU is an electronic module that allows connecting the Bettis electrical

actuator XTE3000 to a Modbus RTU serial communication line. The module has its microprocessor, it

is controlled by a program stored internally, it works as a pure BUS interface and does not affect the

actuator control integrity. It is installed inside the actuator housing and takes the electrical power

from the actuator power supply module. The RS485 interface is located on the module board.

The data lines are fully isolated from the actuator electronics.

All features described in this document are applicable for software revision 2.01 or subsequently.

XTE3000 Modbus RTU module can be mounted only on base card revision 9.00 or higher.

1.1 References

Modbus over serial line specication and implementation guide V1.02.

Available from www.modbus.org.

Modbus application protocol specication V1.1b3. Available from www.modbus.org.

XTE3000 Installation, Operation and Maintenance Manual, VCIOM-14012-EN.

1.2 Modbus RTU or ASCII

Modbus protocol is currently supported by most Programmable Logic Controllers (PLCs). Modbus is a

very simple Master/Slave serial protocol. It supports both ASCII (rarely used) and Binary (RTU) form of

transmission. In ASCII transmission mode each 8-bit byte in a message is sent as 2 ASCII characters.

In RTU transmission mode each 8-bit byte is sent as 2 four-bit hexadecimal characters. The main

advantage of RTU mode is that it allows greater character density than in ASCII mode at the same

baud rate.

The structure of a Modbus message is shown below.

Address Function Data Checksum

October 2022

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

Operation and Storage

Section 2: Operation and Storage

The module is designed to work and to be stored in the same environment of the actuator.

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7 October 2022

Communication Features 3

Section 3: Communication Features

Communication Protocol: Modbus RTU

Transmission Technology: RS485, half duplex

Network Topology: Line (BUS) structure

Transmission Medium: Twisted, screened copper cable

Data Rate: 600, 1200, 2400, 4800, 9600, 19200, 38400 bit/s

Device Number: Maximum 32 devices per segment. If more than 32 devices are

present on the BUS, repeaters should be used

Slave Address: From 1 to 247 (address 0 reserved for broadcast messages),

congurable via local operator interface of actuator

BUS Access: Polling between masters and slaves

Electrical Power: Actuator powered

BUS Termination: Available on board, congurable via local operator

interface of actuator

Temperature: -40 °C, +85 °C

Fieldbus Redundancy: Available by setting the MODE function (CH1, CH2, AUTO)

Auto Baud Rate: Available by setting “Baud Rate = AUTO”

EMC Protections: EN 50081-2 and EN 50082-2

Baud Rate: Congurable via local operator interface of actuator

Addressing: Congurable via local operator interface of actuator

Coding System: 8 bits binary, hexadecimal 0-9, A-F. Two hexadecimal

characters contained in each 8-bit eld of the message

Bits per byte: 1 start bit

8 data bits, least signicant bit sent rst

1 bit for Even/Odd parity; no bit for no parity; congurable

via local operator interface of actuator

1 stop bit with parity; 2 Stop bits without parity

Error Check Field: Cyclical Redundancy Check (CRC)

October 2022

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

Modbus RTU Module

Section 4: Modbus RTU Module

The module consists in a single PCB that is installed inside the actuator housing. It is connected to the

XTE3000 base card via strip connector.

The internal wiring connects the RS485 data lines to the actuator terminal board.

Figure 1 Top Side

Figure 2 Bottom Side

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7 October 2022

Modbus RTU Module

Section 4: Modbus RTU Module

4.1 On Board Indications and Jumpers

Seven LEDs are mounted on the Modbus RTU module to give the following indications for the eld

service. LEDs indicators are active only when jumper JP1 is closed.

DL1 (green) Power Supply: ON: When the Modbus RTU module is correctly

powered from the main power supply

OFF: When the Modbus RTU module is not correctly

powered from the power supply

DL2 (green) CH1 Comm. Status: ON: Data Message received or transmit from

Modbus RTU interface

OFF: Silence between Data Modbus messages

BLINK: Auto Baud Rate Running

DL3 (green) CH2 Comm. Status: ON: Data Message received or transmit from

Modbus RTU interface

OFF: Silence between Data Modbus messages

BLINK: Auto Baud Rate Running

DL4 (green) Termination CH1: ON: Termination Resistance Active on CH1

OFF: Termination Resistance Not Active on CH1

DL5 (green) Termination CH2: ON: Termination Resistance Active on CH2

OFF: Termination Resistance Not Active on CH2

DL6 (red) Base Card Comm. Status: ON: Communication Errors

OFF: Not Communication Errors

DL7 (red) Data Area Empty: ON: When Data Area on interface card is not yet loaded

OFF: When Data Area is completely loaded

BLINK: When Data Area is being read from base card

JP1: LEDs jumper. Short this jumper to power LEDs. (default OFF)

JP2: Program jumper. Used to download new rmware on microcontroller (manufacturer use only)

October 2022

Installation, Operation and Maintenance Manual

VCIOM-15081-EN Rev. 7

Modbus RTU Protocol

Section 5: Modbus RTU Protocol

Section 5: Modbus RTU Protocol Description

Modbus protocol is a messaging structure, used in a wide range of application in process automation

to establish master-slave communication between intelligent devices. Since Modbus is only a

messaging structure, it is independent from the physical layer. It is traditionally implemented using

RS232 or RS422 or RS485. The central controllers (as PLC) communicate via serial connection

with eld devices (as sensors, actuators). The central controller (called master) reads the input

information from the eld devices (called slaves) and writes the output information to the slaves.

The master initiates the transmission which is called “query.” The slave devices answer by sending the

requested data (called “response”) and performing the action requested in the query. The master can

address individual slaves or can send a broadcast message to all slaves.

The gure below shows a query-response cycle.

Figure 3

Address Function Data Checksum

response

query

No response from slaves is done in case of broadcast message. Address 0 is used for the

broadcast message.

If a slave receives the request, but detects a communication error (parity, CRC, etc.) no response

is returned.

If a slave receives the request without a communication error, but cannot handle it (for example,

if the request is to read a non-existent output or register), the slave will return an exception response

informing the master of the nature of error.

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