ABB C250 User manual - Contents
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 .............................................................................. 5
2.6
Serial Connections ................................................................................. 5
3
CONFIGURATION ......................................................................................... 6
3.1
Accessing the Configuration Mode ........................................................ 6
3.2
Setting the Serial Transmission Parameters .......................................... 6
3.3
Setting the MODBUS Address .............................................................. 6
4
MODBUS PROTOCOL .................................................................................. 7
4.1
Introduction ............................................................................................ 7
4.2
MODBUS Function Codes ..................................................................... 8
5
MODBUS FUNCTIONS ................................................................................. 9
5.1
Read Coil Status – Function Code 01 ................................................... 9
5.2
Read Holding Register – Function Code 03 ........................................ 10
5.3
Force Single Coil – Function Code 05 ................................................. 11
5.4
Preset Single Register – Function Code 06 ......................................... 12
5.5
Loopback Test – Function Code 08 .................................................... 13
5.6
Write Multiple Registers – Function Code 16 ....................................... 14
6
EXCEPTION RESPONSES ......................................................................... 15
6.1
Examples ............................................................................................. 15
7
ADDRESSABLE PARAMETERS ................................................................ 16
7.1
COMMANDER 250/V250 – Coils ......................................................... 16
7.2
COMMANDER 250/V250 – Registers .................................................. 16
7.2.1
Analog Inputs ......................................................................... 16
7.2.2
Control Settings ..................................................................... 17
7.2.3
Set Points .............................................................................. 17
7.2.4
Alarm Settings ........................................................................ 18
7.2.5
Ramp/Soak Settings .............................................................. 18