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Table of Contents
Related Manuals for ABB 8241
Summary of Contents for ABB 8241
- Page 1 Operating Instructions 8240 Series Analyzers MODBUS Communication Supplement...
- Page 2 ISO 9001 Cert. No. Q5907 applications. As a part of ABB, a world leader in process automation technology, we offer customers EN 29001 (ISO 9001) application expertise, service and support worldwide. We are committed to teamwork, high quality manufacturing, advanced technology and unrivalled service and support.
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Page 3: Table Of Contents
Company Standard Settings ......2 MODBUS COILS AND REGISTERS ......13 10.1 Single-stream Silica Monitor, INSTALLATION ............3 Model 8241/185 ..........13 Serial Communication 10.1.1 Coils ..........13 10.1.2 Holding Registers ......14 Adaptors for Personal Computers ....3 3.1.1 Five-wire Configuration ...... -
Page 4: Introduction
Preparation of the instrument is detailed in the relevant Instruction Manual supplied with the instrument: Instruction Manual, with additions as detailed in this Section. Instrument Manual Reference • Model 8241 2.1 Company Standard Settings Colorimetric Silica Monitor – IM/8241 Only those parameters detailed on the customer order are •... -
Page 5: Installation
3 INSTALLATION 4 ELECTRICAL CONNECTIONS Observe the limitations outlined in the installation information connections, apart from those serial data of the relevant Instruction Manual. The maximum serial data communication, are made as shown in Figs. 2.3 and 2.5 of the transmission line length for both RS422 and RS485 systems is relevant Instruction Manual. - Page 6 …4 ELECTRICAL CONNECTIONS …4.1 Serial Connections Output Board Motherboard See Figs. 2.4 & 2.5 of the relevant Instruction Manual 1 – Tx+ 1 – Tx+/Rx+ 2 – Rx+ 2 – Not Connected 3 – Common (0V) 3 – Common (0V) 4 –...
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Page 7: Setting Up
5 SETTING UP For all aspects other than serial data transmission the transmitter is set up as shown in the relevant Instruction Output Board Manual. Unless otherwise requested, the instrument is despatched with a transmission rate of 9600 baud and IC32 IC31 transmission line termination resistors linked-out. -
Page 8: Programming
6 PROGRAMMING The general programming procedure is as detailed in the relevant Instruction Manual, but with an additional Set Up Serial Interface frame in the page. Set Up Instrument Page 0 xx/x xxxxxxxxxxx DIAGNOSTIC INFORMATION PAGE 1.0 Next 5 weekly service = DD/MM Next yearly service DD/MM/YY... -
Page 9: Modbus Protocol
7 MODBUS PROTOCOL 7.1 Introduction to MODBUS Protocol (RTU only) MODBUS communication is based on a master and a slave arrangement. The master sends a message to one slave at a time and waits for a reply. The slave cannot accept a new message until the existing message is processed and a reply sent to the master (maximum response time 250 milliseconds). -
Page 10: Modbus Functions
8 MODBUS FUNCTIONS This section shows typical examples of MODBUS function codes 01, 03, 05, 06, 08 and 16. 8.1 Read Coil Status – Function Code 01 8.1.1 Read Coil Status Query This function allows the user to obtain the ON/OFF status of logic coils used to control discrete outputs from the addressed slave only. -
Page 11: Read Holding Register Response
…8 MODBUS FUNCTIONS 8.2.2 Read Holding Register Response The addressed slave responds with its address and function code, followed by the information field. The information field contains 1 byte describing the quantity of data bytes to be returned. The contents of each register requested (DATA) is two bytes, the first byte includes the high order bits and the second the low order bits. -
Page 12: Preset Single Register
8 MODBUS FUNCTIONS… 8.4 Preset Single Register – Function Code 06 8.4.1 Preset Single Register Query The preset single register allows the user to modify the contents of a holding register. Note. Function codes 5, 6 and 16 are the only messages that are recognized as valid for broadcast. Example –... -
Page 13: Loopback Test
…8 MODBUS FUNCTIONS 8.5 Loopback Test – Function Code 08 8.5.1 Loopback Test Query The purpose of the loopback test is to test the MODBUS system, it does not affect the content of the controller. Variations in the response may indicate faults in the MODBUS system. The information field contains 2 bytes for the designation of the diagnostic code followed by 2 bytes to designate the action to be taken. -
Page 14: Exception Responses
9 EXCEPTION RESPONSES The exception response codes sent by the slave are shown in Table 9.1. When a slave detects one of these errors, it sends a response message to the master consisting of slave address, function code, error code and error check fields. Exception Response Exception Response Name... -
Page 15: Modbus Coils And Registers
10 MODBUS COILS AND REGISTERS 10.1 Single-stream Silica Monitor, Model 8241/185 10.1.1 Coils Input Number Read/Write Description Response/Entry Monitor Status 0 = Monitor In Service 1 = Monitor Not In Service Monitor Calibration Status 0 = Monitor Not In Calibration... -
Page 16: Holding Registers
…10 MODBUS COILS AND REGISTERS …10.1 Single-stream Silica Monitor, Model 8241/185 10.1.2 Holding Registers Input Number Read/Write Description Response/Entry Units 0=ppb, 1=µg/L, 2=µg/kg Maximum Output Range 0=0-2000, 1=0-5000 Scaled between 0.0 and 100.0 °C Optical System Temperature Scaled between 0.0 and 100.0 °C... - Page 17 10 MODBUS COILS AND REGISTERS… …10.1 Single-stream Silica Monitor, Model 8241/185 …10.1.2 Holding Registers Input Number Read/Write Description Response/Entry Displayed Slope 0.0 – 100.0 Silica Concentration Scaled 0 to 2000 or 0 to 5000 with decimal point Silica Concentration Scaled 0 to 2000 or 0 to 5000 with no decimal doint...
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Page 18: Multi-Stream Silica Monitor, Model 8241/195
…10 MODBUS COILS AND REGISTERS 10.2 Multi-stream Silica Monitor, Model 8241/195 10.2.1 Coils Coils used on Multi-stream monitors are identical to those used on single-stream versions – see Section 10.1.1. 10.2.2 Holding Registers In addition to the Holding Registers listed in Section 10.1.2 above, Multi-stream monitors use the following Holding Registers:... -
Page 19: Single-Stream Phosphate Monitor, Model 8242/185
10 MODBUS COILS AND REGISTERS… 10.3 Single-stream Phosphate Monitor, Model 8242/185 10.3.1 Coils Input Number Read/Write Description Response/Entry Monitor Status 0 = Monitor In Service 1 = Monitor Not In Service Monitor Calibration Status 0 = Monitor Not In Calibration 1 = Monitor In Calibration Hold Mode 0 = Hold Mode Off... -
Page 20: Holding Registers
…10 MODBUS COILS AND REGISTERS …10.3 Single-stream Phosphate Monitor, Model 8242/185 …10.3.2 Holding Registers Input Number Read/Write Description Response/Entry Units 3=ppb, 4=mg/L, 5=mg/kg Optical Filter 0=Filter 1, 1=Filter 2 Scaled between 0.0 and 100.0 °C Optical System Temperature Scaled between 0.0 and 100.0 °C Reaction Block Temperature Real-time Clock Hours... - Page 21 10 MODBUS COILS AND REGISTERS… …10.3 Single-stream Phosphate Monitor, Model 8242/185 …10.3.2 Holding Registers Input Number Read/Write Description Response/Entry Displayed Slope 0.0 to 100.0 Phosphate Concentration Scaled 0 to 10.00 with 2 decimal places Phosphate Concentration Scaled 0 to 60.0 with 1 decimal place Phosphate Concentration 0=1 dp, 1=2 dp Decimal Point Status...
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Page 22: Multi-Stream Phosphate Monitor, Model 8242/195
…10 MODBUS COILS AND REGISTERS 10.4 Multi-stream Phosphate Monitor, Model 8242/195 10.4.1 Coils Coils used on Multi-stream monitors are identical to those used on single-stream versions – see Section 10.3.1. 10.4.2 Holding Registers In addition to the Holding Registers listed in Section 10.3.2 above, Multi-stream monitors use the following Holding Registers: Input Number Read/Write Description... -
Page 23: Operation
11 OPERATION Before attempting any serial communication, first ensure that the 8240 Monitors connected to the computer terminal or host computer by serial link are functioning correctly as individual instruments. Ensure that the serial data connections to the 8240 Monitor have been made correctly with respect to the computer terminal, or host computer, interface. - Page 24 …11 OPERATION Check that the parameters programmed in the instrument’s are compatible with those of the Serial Data Communication Page computer terminal or host computer – see Section 7. If communication is still not possible or is erratic, check that the computer terminal, or host computer, interface has pull-up ant pull-down resistors connected as shown in Figs.
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Page 25: Specification
12 SPECIFICATION APPENDICES A1 Non-volatile Memory Limitations As detailed in the relevant Instruction Manual, with the following additions: Note. If the number of write cycles to any particular EIA Communication RS422, RS485 non-volatile memory register exceeds 10 write cycles, the Standards 2-wire or 4-wire modes register’s contents may not be retained. - Page 26 NOTES...
- Page 27 United Kingdom • Sensors ABB Limited pH, redox, selective ion, conductivity and dissolved Tel: +44 (0)1453 826661 oxygen. Fax: +44 (0)1453 827856 • Laboratory Instrumentation pH and dissolved oxygen meters and associated United States of America sensors.
- Page 28 ABB has Sales & Customer Support The Company’s policy is one of continuous product improvement and the right is reserved to modify the expertise in over 100 countries worldwide information contained herein without notice. www.abb.com Printed in UK (08.02) © ABB 2002 ABB Limited ABB Inc.