Danfoss vacon nx, optc2, optc8 User guide

vacon nx

ac drives

optc2/c8

modbus/n2 option board

user manual

INDEX Document code: DPD00899A

Date 19.01.2012

1. GENERAL ........................................................................................................................... 3

2.

RS-485 OPTION BOARD TECHNICAL DATA ........................................................................ 4

2.1 General ......................................................................................................................................... 4

3.

RS-485 FIELDBUS BOARD LAYOUT AND CONNECTIONS ................................................... 5

3.1 RS-485 OPTC2 option board ......................................................................................................... 5

3.2 RS-485 OPTC8 option board ......................................................................................................... 6

3.3 Grounding ..................................................................................................................................... 7

3.3.1 Grounding by clamping the cable to the converter frame .................................................7

3.3.2 Grounding only one point on the net ..................................................................................9

3.3.3 Grounding jumper X1 ....................................................................................................... 10

3.4 Bus terminal resistors................................................................................................................ 11

3.5 Bus Biasing ................................................................................................................................. 12

3.6 LED indications ........................................................................................................................... 13

4.

5.

INSTALLATION OF VACON NX RS-485 BOARD ................................................................. 14

COMMISSIONING .............................................................................................................. 16

5.1 Fieldbus board parameters ........................................................................................................ 16

6.

MODBUS ........................................................................................................................... 19

6.1 Modbus RTU protocol, introduction ............................................................................................ 19

6.1.1 Supported functions ......................................................................................................... 21

6.1.2 Exception responses ........................................................................................................ 23

6.2 Modbus interface ........................................................................................................................ 25

6.2.1 Modbus registers ............................................................................................................. 25

6.2.2 Process data .................................................................................................................... 25

6.2.3 Process data in ................................................................................................................ 26

6.2.4 Process data out .............................................................................................................. 27

6.2.5 Parameters ...................................................................................................................... 30

6.2.6 Actual values .................................................................................................................... 30

6.2.7 Example messages .......................................................................................................... 31

6.3 Start-up test ............................................................................................................................... 33

7.

METASYS N2 ..................................................................................................................... 34

7.1 Metasys N2 Protocol Introduction .............................................................................................. 34

7.2 Metasys N2 interface .................................................................................................................. 34

7.2.1 Analogue Input (AI) .......................................................................................................... 34

7.2.2 Binary Input (BI) ............................................................................................................... 34

7.2.3 Analogue Output (AO)....................................................................................................... 35

7.2.4 Binary Output (BO) ........................................................................................................... 35

7.2.5 Internal Integer (ADI) ....................................................................................................... 35

7.3 N2 POINT MAP ............................................................................................................................ 36

7.3.1 Analogue Inputs (AI) ......................................................................................................... 36

7.3.2 Binary Inputs (BI) ............................................................................................................. 37

7.3.3 Analogue Outputs (AO) ..................................................................................................... 37

7.3.4 Binary Outputs (BO) ......................................................................................................... 38

7.3.5 Internal Integers (ADI) ..................................................................................................... 38

8.

FAULT TRACKING ............................................................................................................. 39

APPENDIX 1 ............................................................................................................................................ 40

general vacon • 3

1

WARNING!

1. GENERAL

Instead of sending and receiving information to and from frequency converters through I/O, you can
connect them to a fieldbus.

Vacon NX frequency converters can be connected to the RS-485 bus using a fieldbus board. The con­verter can then be controlled, monitored and programmed from the host system.

If you purchase your RS-485 Option Board separately, please note that it shall be installed in
the control board of the frequency converter.

slot E on

Internal components and circuit boards are at high potential when the frequency
converter is connected to the power source. This voltage is extremely dangerous
and may cause death or severe injury if you come into contact with it.

24-hour support [phone] • Email: [e-mail]

4 • vacon technical data

Connections

OPTC2
OPTC8

Communications

Environment

Ambient operating

–10°C…55°C

Safety

2. RS-485 OPTION BOARD TECHNICAL DATA

2.1 General

Interface

Data transfer
method
Transfer cable Twisted pair (1 pair and shield)
Electrical isolation 500 VDC
Modbus RTU
Metasys N2

Baud rate 300, 600, 1200, 2400, 4800, 9600, 19200 and 38400 kbaud
Addresses 1 to 247

temperature
Storing tempera­ture
Humidity <95%, no condensation allowed
Altitude Max. 1000 m
Vibration 0.5 G at 9…200 Hz
Fulfils EN50178 standard

Table 1. RS-485 technical data

: Pluggable connector (5.08mm)
: 9-pin DSUB connector (female)

RS-485, half-duplex

As described in document “Modicon Modbus Protocol
Reference Guide”

Find it for example at: http://public.modicon.com/

As described in Metasys N2 System Protocol Specifica­tion

–40°C…60°C

2

Tel.[phone] • Fax [phone]