ABB ControlMaster CM50 Communications Supplement

ControlMaster CM10, CM15, CM30 and CM50
Universal process controllers and indicators,
1
/8,
1
/4 and
1
/2 DIN Contents
IM/CM/C–EN 1
Contents
1 Safety .......................................................................... 2
1.1 Electrical Safety ................................................... 2
1.2 Symbols .............................................................. 2
1.3 Health & Safety .................................................... 3
2 Introduction ................................................................ 4
2.1 EC Directive 89/336/EEC ..................................... 4
3 Communication Overview .......................................... 5
3.1 Communication Options ...................................... 5
3.1.1 Ethernet .................................................. 5
3.1.2 RS 485 MODBUS ................................... 6
3.2 PC Configuration ................................................. 7
4 Communication Level ................................................ 8
4.1 Communication ................................................... 8
5 MODBUS Communications ..................................... 13
5.1 Electrical Connections ....................................... 13
5.2 Host Computer Serial Communications ............. 13
5.3 Two-wire and Four-wire Connection .................. 15
5.4 Pull-up and Pull-down Resistors ........................ 16
5.5 Termination Resistor .......................................... 16
5.6 Serial Connections ............................................. 17
5.7 Input Coils – Digital Inputs .................................. 18
5.8 Output Coils ....................................................... 19
5.9 Input Registers ................................................... 20
5.9.1 Read-only 32 Bits ................................. 20
5.9.2 Read-only Single Precision Float ........... 20
5.9.3 Input Registers For Bytes ...................... 21
5.10 Holding Registers ............................................... 21
5.10.1 Writable 16 Bits ..................................... 21
5.10.2 Writable 32 Bits ..................................... 22
5.10.3 Writable Single Precision Float .............. 22
6 Ethernet Connections ............................................... 24
7 Specification ............................................................. 25

ABB ControlMaster CM50 Specifications

General

Brand	ABB
Model	ControlMaster CM50
Category	Controller
Language	English