Table Of Contents - ABB DATUM L150 Operating Manual

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
7.2 Registers ............................................................................................. 18
7.2.1
7.2.2
7.2.3
............................................................................................... 18
Analog Inputs ........................................................................ 18
Alarm Settings ....................................................................... 19
Maths Functions .................................................................... 19
1