ABB DATUM L150 Manual de usuario

ABB Instrumentation

DATUM L150/160 Operating Guide

MODBUS (RTU)

Communications Option

DATUML150

888888

DATUML160

Note.

Clarification of an instruction or

additional information.

Information.

Further reference for more detailed

information or technical details.

Use of Instructions

Although Warning hazards are related to personal injury, and Caution hazards are

associated with equipment or property damage, it must be understood that operation of

damaged equipment could, under certain operational conditions, result in degraded

process system performance leading to personal injury or death. Therefore, comply fully

with all Warning and Caution notices.

Informationinthismanualisintendedonlytoassistourcustomersintheefficientoperation

of our equipment. Use of this manual for any other purpose is specifically prohibited and

its contents are not to be reproduced in full or part without prior approval of Technical

Communications Department, ABB Instrumentation.

Health and Safety

To ensure that our products are safe and without risk to health, the following points

must be noted:

1. The relevant sections of these instructions must be read carefully before

proceeding.

2. Warning labels on containers and packages must be observed.

3. Installation, operation, maintenance and servicing must only be carried out by

suitably trained personnel and in accordance with the information given.

4. Normal safety precautions must be taken to avoid the possibility of an accident

occurring when operating in conditions of high pressure and/or temperature.

5. Chemicalsmustbestoredawayfromheat,protectedfromtemperatureextremes

and powders kept dry. Normal safe handling procedures must be used.

6. When disposing of chemicals ensure that no two chemicals are mixed.

Safety advice concerning the use of the equipment described in this manual or any

relevant hazard data sheets (where applicable) may be obtained from the Company

address on the back cover, together with servicing and spares information.

Warning.

An instruction that draws attention to

the risk of injury or death.

Caution.

An instruction that draws attention to

the risk of damage to the product,

process or surroundings.

CONTENTS

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

2 ELECTRICAL INSTALLATION .................................................................... 3

2.1 Host Computer Serial Communications............................................... 3

2.2 OPTO22 Boards for use with Personal Computers............................. 3

2.3 Two-wire and Four-wire Connection .................................................... 3

2.4 Pull-up and Pull-down Resistors .......................................................... 6

2.5 Termination Resistor ............................................................................ 6

2.6 Serial Connections ............................................................................... 6

3 CONFIGURATION ........................................................................................ 8

3.1 Accessing the Configuration Mode ...................................................... 8

3.2 Setting the Serial Transmission Parameters ....................................... 8

3.3 Setting the MODBUS Address ............................................................. 8

4 MODBUS PROTOCOL ................................................................................. 9

4.1 Introduction ........................................................................................... 9

4.2 MODBUS Function Codes.................................................................. 10

5 MODBUS FUNCTIONS............................................................................... 11

5.1 Read Coil Status – Function Code 01 ............................................... 11

5.2 Read Holding Register – Function Code 03 ...................................... 12

5.3 Force Single Coil – Function Code 05 ............................................... 13

5.4 Preset Single Register – Function Code 06 ...................................... 14

5.5 Loopback Test – Function Code 08 ................................................... 15

5.6 Write Multiple Registers – Function Code 16 .................................... 16

6 EXCEPTION RESPONSES ........................................................................ 17

6.1 Examples ............................................................................................ 17

7 ADDRESSABLE PARAMETERS............................................................... 18

7.1 Coils ............................................................................................... 18

7.2 Registers ............................................................................................. 18

7.2.1 Analog Inputs ........................................................................ 18

7.2.2 Alarm Settings....................................................................... 19

7.2.3 Maths Functions.................................................................... 19

1 INTRODUCTION

This Operating Guide describes the DATUM L150/L160 MODBUS serial data

communications option and must be used in conjunction with the standard

User

Guide

(

IM/L150 or IM/L160

) supplied with the instrument.

Information.

The MODBUS option provides the following facilities:

• Standard RS422/485 communications.

• MODBUS RTU protocol – for master (host computer) to slave

(DATUM L150/L160) system.

• 500V d.c. isolation from external connections to the instrument.

• Two-wire or four-wire communication.

• 2400 or 9600 baud transmission rate.

• Parity-checking – odd, even or none.

2 ELECTRICAL INSTALLATION

This section describes the connection of serial data transmission cables between

the master (host computer) and slave DATUM L150/L160 instruments on a

MODBUS serial link. All connections other than those used for serial

communication are shown in Section 5 of the relevant

User Guide

2.1 Host Computer Serial Communications

An RS422/485 communications driver must be fitted to the host computer. It is

strongly recommended that the interface has galvanic isolation to protect the

computer from lightning damage and increase signal immunity to noise pick-up.

2.2 OPTO22 Boards for use with Personal Computers

Where a personal computer is used as the host computer, the following OPTO22

boards are recommended for use with the DATUM L150/L160 Series of

instruments:

Part No. Computer Type

AC24 AT AT Bus IBM PC compatible

AC34 Microchannel IBM PC

2.3 Two-wire and Four-wire Connection – Figs. 2.1 and 2.2

MODBUSserialcommunicationsmustbeconfigured as either two-wire or four-wire

seriallinks – seeFigs. 2.1 and2.2. Two-/Four-wire operationmust also beselected

in the Configuration Mode – see Section 3.1.

…2 ELECTRICAL INSTALLATION

2.4 Pull-up and Pull-down Resistors – Figs. 2.1 and 2.2

To prevent false triggering of slaves when the master (host computer) is inactive,

pull-upandpull-down resistors must be fittedtotheRS422/485interface in the host

computer – see Figs. 2.1 and 2.2.

+5V

1.8kΩPull-up

Resistor

1.8kΩPull-down

Resistor

Host Computer

Rx–

Rx+

Tx–

Tx+

'A'

'B'

GND

Tx+/Rx+

Tx–/Rx–

GND

+5V

1.8kΩPull-up

Resistor

1.8kΩPull-down

Resistor

Host Computer

Rx–

Rx+

Tx–

Tx+

'A'

'B'

GND

Tx+/Rx+

Tx–/Rx–

GND

11 12 13

Fig. 2.1b Two-wire Operation – L160

Fig. 2.1a Two-wire Operation – L150

2 ELECTRICAL INSTALLATION…

…2.4 Pull-up and Pull-down Resistors

Host Computer

+5V

'A 'B

1.8kΩ

Pull-down

Resistor

1.8kΩPull-up

Resistor

+5V

1.8kΩ

Pull-down Resistor

1.8kΩ

Pull-up

Resistor

Rx+

Rx–

Tx–

Tx+

GND

Fig. 2.2a Four-wire Operation – L150

Fig. 2.2b Four-wire Operation – L160

Host Computer

+5V

'A 'B

1.8kΩ

Pull-down

Resistor

1.8kΩPull-up

Resistor

+5V

1.8kΩ

Pull-down Resistor

1.8kΩ

Pull-up

Resistor

Rx+

Rx–

Tx–

Tx+

GND

9 10 11 12 13

…2 ELECTRICAL INSTALLATION

2.5 Termination Resistor – Fig. 2.3

For long transmission lines, a 120Ωtermination resistor must be fitted to the last

slave in the chain – see Fig. 2.3.

First

lave Last

lave

Tx+

Tx-

Rx+

Rx-

GND

120Ω

Termination Resistor

(External)

Rx+

Rx–

Tx+

Tx–

GND

Tx+

Tx–

Rx+

Rx–

GND

Host

Computer

Fig. 2.3 Connecting Multiple Slaves

2.6 Serial Connections – Figs. 2.1 to 2.4

Information.

• Up to 10 slaves can be connected to a single RS422 adaptor card on a PC.

• Up to 32 slaves can be connected to a single RS485 adaptor card on a PC.

The number of slaves can be increased if the driver's serial port permits.

Connections to the MODBUS serial board must be made as shown in Figs. 2.1, 2.2

or 2.4. Connections on links with multiple slaves must be made in parallel, as

shown in Fig. 2.3. When connecting cable screens, ensure that no 'ground loops'

are introduced.

Themaximum serial datatransmission line length forboth RS422 and RS485 systems is

1200m. The types of cable that can be used are determined by the total line length:

Up to 6m – standard screened or twisted pair cable.

Up to 300m – twin twisted pair with overall foil screen and an integral drain

wire, e.g. Belden 9502 or equivalent.

Up to 1200m – twin twisted pair with separate foil screens and integral drain

wires, e.g. Belden 9729 or equivalent.

2 ELECTRICAL INSTALLATION

…2.6 Serial Connections – Figs. 2.1 to 2.4

Rx+

Rx–

Tx+

GND

Rx+

Rx–

Tx+

Tx–

GND

OPTO22 Adaptor

Board Connections

Screen

Tx– 8

Fig. 2.4 OPTO22 Board Connections

3 CONFIGURATION

Fig. 3.1 Setting Serial Transmission Parameters

Information.

• Programmable baud rate – 2400 or 9600 baud.

• Selectable parity – odd, even or none.

• Address range – 1 to 99.

For MODBUS communications to operate correctly, each DATUM L150/L160 must

be configured with the correct serial transmission parameters and assigned a

unique address.

3.1 Accessing the Configuration Mode

The procedure for accessing the Configuration Mode is detailed in Section 4.2 of

the relevant

User Guide.

When all parameters have been programmed, return the

instrument to the Operator Mode.

3.2 Setting the Serial Transmission Parameters – Fig. 3.1

Fig. 3.1 shows the display readouts and options available when defining the serial

transmission rate and bit parity for DATUM L150/L160 instruments. Further detail

on the procedures required to set each parameter are shown in Section 4.3 of the

relevant

User Guide.

3.3 Setting the MODBUS Address

To allow the master to differentiate between more than one slave in a system, each

slave on a MODBUS link must be assigned a unique address in the range 1 to 99

– see Section 4.4 of the relevant

User Guide

(MODBUS Address Frame, Addr).

Display

Parity

0 None

1Odd

2 Even

S 0000t 0000

S – Serial Communication Configuration T – Serial Communications Parity

Display Baud Rate, 2/4-wire

0Off

1 2400, 2-wire

2 2400, 4-wire

3 9600, 2-wire

4 9600, 4-wire

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