ABB COMMANDER 500 Manuale utente
ABB Instrumentation
COMMANDER 500 User Guide
MODBUS Serial
Communications
50.5
15.0
COMMANDER 500
50.1
ABB INSTRUMENTATION
BS EN ISO 9001
St Neots, U.K. – Cert. No. Q5907
Stonehouse, U.K. – Cert. No. FM 21106
The Company
ABB Instrumentation is an established world force in the design and
manufacture of instrumentation for industrial process control, flow
measurement, gas and liquid analysis and environmental
applications.
As a part of ABB, a world leader in process automation technology,
we offer customers application expertise, service and support
worldwide.
We are committed to teamwork, high quality manufacturing,
advanced technology and unrivalled service and support.
The quality, accuracy and performance of the Company’s products
result from over 100 years experience, combined with a continuous
program of innovative design and development to incorporate the
latest technology.
The NAMAS Calibration Laboratory No. 0255 is just one of the ten
flow calibration plants operated by the Company, and is indicative of
ABB Instrumentation's dedication to quality and accuracy.
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,maintenanceandservicingmustonlybecarriedoutbysuitablytrainedpersonneland
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. Chemicals must be stored away from heat, protected from temperature extremes and powders kept dry.
Normal safe handling procedures must be used.
6. When disposing of chemicals ensure that no two chemicals are mixed.
Safetyadvice concerningthe useof theequipment describedin thismanual orany relevanthazard datasheets
(where applicable) may be obtained from the Company address on the back cover, together with servicing and
spares information.
✶
Note.
Clarification of an instruction or additional
information.
Information.
Further reference for more detailed information or
technical details.
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,resultindegradedprocesssystemperformanceleading topersonalinjuryordeath.Therefore,comply
fully with all Warning and Caution notices.
Informationin thismanualis intendedonlyto assistourcustomers intheefficient operation ofour 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.
Stonehouse, U.K.
EN 29001 (ISO 9001)
Lenno, Italy – Cert. No. 9/90A
Use of Instructions
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.
R
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T
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0255
Licensing, Trademarks and Copyrights
MODCELL™ and PC-30™ are trademarks of Asea Brown Boveri, Inc.
Modbus™ is a trademark of Modicon, Inc.
IBM™ and IBM PC AT™ are trademarks of International Business Machines Corp.
1
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 .. 4
2.5 Termination Resistor ..................... 4
2.6 Serial Connections........................ 5
3 CONFIGURATION .................................. 6
3.1 Accessing the Serial
Configuration Displays.................. 6
3.2 Setting the Serial Transmission
Parameters.................................... 7
4 MODBUS PROTOCOL ........................... 8
4.1 Introduction ................................... 8
4.2 MODBUS Function Codes............ 9
5 MODBUS FUNCTIONS ........................ 10
5.1 Read Coil Status –
Function Code 01........................ 10
5.2 Read Holding Register –
Function Code 03.........................11
5.3 Force Single Coil –
Function Code 05........................ 12
5.4 Preset Single Register –
Function Code 06........................ 13
5.5 Loopback Test –
Function Code 08........................ 14
5.6 Force Multiple Coils –
Function Code 15........................ 15
5.7 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 Analog Input Registers ............... 19
7.3 Single Loop Parameters
(Templates 1 and 2) .................... 19
7.4 Auto/manual Station and Analog
Backup Parameters
(Templates 3 to 6) ....................... 20
7.5 Indicator and Manual
Loader Station Parameters
(Templates 7 an 8) ...................... 20
7.6 Feedforward Parameters
(Templates 9 and 10) .................. 20
7.7 Cascade Parameters
(Templates 11 and 12) ................ 21
7.8 Cascade with
Feedforward Parameters
(Template 13) .............................. 21
7.9 Ratio Station and
Controller Parameters
(Templates 14 to 17) ................... 22
7.10 Control Monitor ........................... 22
7.11 Tuning Parameters ..................... 23
7.12 Set Point Parameters.................. 23
7.13 Alarm Parameters ....................... 24
7.14 Motorized Valve Parameters ...... 25
7.15 Basic Configuration..................... 26
7.16 Maths Blocks............................... 28
2
1 INTRODUCTION
This Operating Guide describes the COMMANDER 500 MODBUS serial data communications
option and must be used in conjunction with the standard
User Guide
(part no. IM/C501 or IM/C505)
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 (COMMANDER 500) system.
• Isolation from external connections to the instrument. Dielectric strength 500V d.c. for 1
minute.
• Two-wire or four-wire communication.
• 2400, 9600 or 19200 baud transmission rate.
• Parity-checking – odd, even or none.
3
2 ELECTRICAL INSTALLATION
This section describes the connection of serial data transmission cables between the master (host
computer)andslaveCOMMANDER500 instruments on a MODBUS seriallink.Allconnectionsother
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 COMMANDER 500 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
MODBUSserial communications mustbe configured aseither two-wire orfour-wire serial links– see
Figs. 2.1 and 2.2. Two-/four-wire operation must also be selected in the Configuration Mode – see
Section 3.1.
Fig. 2.1 Pull-up and Pull-down Resistors (Two-wire Operation)
+5V
0V
1.8kΩPull-up
Resistor
1.8kΩPull-down
Resistor
Host Computer
Rx–
Rx+
Tx–
Tx+
'A'
'A
'B'
'B
GND
32
33
34
35
36
C500
Tx+/Rx+
Tx–/Rx–
Common
4
…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-up and pull-
downresistorsmustbefittedtotheRS422/485interfaceinthehostcomputer–seeFigs.2.1and2.2.
Fig. 2.3 Connecting Multiple Slaves
Fig. 2.2 Pull-up and Pull-down Resistors (Four-wire Operation)
Host Computer
+5V
0V
'A 'B
1.8kΩ
Pull-down
Resistor
1.8kΩPull-up
Resistor
0V
+5V
0V
'A
'B
1.8kΩ
Pull-down Resistor
1.8kΩ
Pull-up
Resistor
Rx+
Rx–
Tx–
Tx+
C
32
33
34
35
36
C500
First Slave Last Slave
Tx+
Tx-
Rx+
Rx-
C
120Ω
Termination Resistor
(External)
Master
Rx+
Rx–
Tx+
Tx–
GND
Tx+
Tx–
Rx+
Rx–
C
32
33
34
35
36
C500
Host
Computer
32
33
34
35
36
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.
5
2 ELECTRICAL INSTALLATION
Fig. 2.4 OPTO22 Board Connections
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.
Themaximumserialdatatransmissionlinelength forbothRS422 andRS485systemsis1200m.Thetypes
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.
Rx+
Rx–
C500
Tx+
GND
Rx+
Rx–
Tx+
Tx–
GND
OPTO22 Adaptor
Board Connections
Screen
Tx– 8
9
4
5
3
32
33
34
35
36
6
3 CONFIGURATION
Information.
• Programmable baud rate – 2400, 9600 or 19200 baud.
• Selectable parity – odd, even or none.
• Address range – 1 to 99.
For MODBUS communications to operate correctly, each COMMANDER 500 must be configured
with the correct serial transmission parameters and assigned a unique address.
3.1 Accessing the Serial Configuration Displays
450.2
500.0
70
xxxx
COdE
50
AtNE
LEV2 LEV5
tUNE VLVE
LEV6
APPL
LEVd
SErL
LEV.6
APPL
6.00
LEV.5
VALV
6.00
LEV1
OPEr Press
and hold
Press
and hold Set the
correct
password
50.1
50.5
50
Fig. 3.1 Access to Serial Configuration Displays
7
3 CONFIGURATION
3.2 Setting the Serial Transmission Parameters
Level d – Serial Communications Configuration
Note. To select this frame from anywhere in this page,
press the key for a few seconds.
Serial Configuration
0OFF
12-wire connection, 2400 baud rate
24-wire connection, 2400 baud rate
32-wire connection, 9600 baud rate
44-wire connection, 9600 baud rate
52-wire connection, 19200 baud rate
64-wire connection, 19200 baud rate
Parity
None
Odd
Even
MODBUS address
[1 to 99]
Return to top of page.
SErL
LEVd
d.00
1
Addr
d.03
NONE
PrtY
d.02
0
S.CFG
d.01
8
4 MODBUS PROTOCOL
Information.
• The COMMANDER 500 operates as a MODBUS, Remote Terminal Unit (RTU) slave.
• Parity checking – detects transmission errors in individual characters.
• Cyclic redundancy checking – detects errors in the master messages and slave responses.
4.1 Introduction
MODBUS communication uses the master/slave principle to send messages to one or more slaves.
Each slave is given a unique identity address (between 1 and 99).
A broadcast address (address zero) can be used to write to all slave devices simultaneously, using
one command. In this instance there is no slave acknowledgment.
Slavescannotaccept new messages untilthecurrent message hasbeenprocessedand a replysent
to the master (maximum response time 125ms). The slave monitors the elapsed time between
receipt of characters. If the elapsed time without a new character is31/2character times, the slave
assumes the next character received is the start of a new message.
Note. MODBUS RTU requires 1 start bit, 8 data bits, 1 parity bit (optional) and 1 or 2 stop
bits.
Indice
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