Danfoss FC 100 Series Especificações descarregar pdf (Página 70)

Conversion index Conversion factor

74 0.1

2 100

1 10

0 1

-1 0.1

-2 0.01

-3 0.001

-4 0.0001

-5 0.00001

7.4.13 Process Words (PCD)

The block of process words is divided into two blocks of

16 bits, which always occur in the defined sequence.

PCD 1 PCD 2

Control (master⇒ slave Control word)

Reference-value

Control (slave ⇒ master) Status word

Present output

frequency

7.5 Examples

7.5.1 Writing a Parameter Value

Change 4-14 Motor Speed High Limit [Hz] to 100Hz.

Write the data in EEPROM.

PKE = E19E Hex - Write single word in 4-14 Motor Speed

High Limit [Hz]:

IND = 0000 Hex

PWEHIGH = 0000 Hex

PWELOW = 03E8 Hex

Data value 1000, corresponding to 100Hz, see

7.3.12 Conversion.

The telegram looks like this:

E19E H

PKE IND PWE

high

PWE

low

0000 H 0000 H 03E8 H

130BA092.10

Note: 4-14 Motor Speed High Limit [Hz] is a single word, and

the parameter command for write in EEPROM is “E”.

Parameter number 4-14 is 19E in hexadecimal.

The response from the slave to the master is:

119E H

PKE

IND

PWE

high

PWE

low

0000 H 0000 H 03E8 H

130BA093.10

7.5.2

Reading a Parameter Value

Read the value in 3-41 Ramp 1 Ramp up Time

PKE = 1155 Hex - Read parameter value in 3-41 Ramp 1

Ramp up Time

IND = 0000 Hex

PWEHIGH = 0000 Hex

PWELOW = 0000 Hex

1155 H

PKE IND PWE

high

PWE

low

0000 H 0000 H 0000 H

130BA094.10

If the value in 3-41 Ramp 1 Ramp up Time is 10 s, the

response from the slave to the master is:

130BA267.10

1155 H

PKE

IND

0000 H 0000 H 03E8 H

PWE

high

PWE

low

3E8 Hex corresponds to 1000 decimal. The conversion

index for 3-41 Ramp 1 Ramp up Time is -2, i.e. 0.01.

3-41 Ramp 1 Ramp up Time is of the type Unsigned 32.

7.6

Modbus RTU Overview

7.6.1 Assumptions

Danfoss assumes that the installed controller supports the

interfaces in this document, and strictly observe all

requirements and limitations stipulated in the controller

and frequency converter.

7.6.2

What the User Should Already Know

The Modbus RTU (Remote Terminal Unit) is designed to

communicate with any controller that supports the

interfaces defined in this document. It is assumed that the

user has full knowledge of the capabilities and limitations

of the controller.

7.6.3

Modbus RTU Overview

Regardless of the type of physical communication

networks, the Modbus RTU Overview describes the process

a controller uses to request access to another device. This

process includes how the Modbus RTU responds to

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