Parameter Settings For Modbus Communication; Fc Protocol - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS485 Installation and Set-...
1
1 DIP switch
2 DIP switch set to factory setting, OFF position
3 DIP switch ON position
Illustration 3.4 DIP Switch set to Factory Setting
3.1.4 Parameter Settings for Modbus
Communication
Parameter Function
Parameter 8-30 Prot Select the application protocol to run for
ocol the RS485 interface.
Parameter 8-31 Add Set the node address.
NOTICE
ress
The address range depends on the
protocol selected in
parameter 8-30 Protocol.
Parameter 8-32 Bau Set the baud rate.
NOTICE
d Rate
The default baud rate depends on the
protocol selected in
parameter 8-30 Protocol.
Parameter 8-33 Pari Set the parity and number of stop bits.
NOTICE
ty / Stop Bits
The default selection depends on the
protocol selected in
parameter 8-30 Protocol.
Parameter 8-35 Min Specify a minimum delay time between
imum Response receiving a request and transmitting a
Delay response. This function is for overcoming
modem turnaround delays.
MG03N202
Programming Guide
Parameter
Parameter 8-36 Ma
ximum Response
Delay
Parameter 8-37 Ma
ximum Inter-char
delay
2
3
Table 3.2 Modbus Communication Parameter Settings

3.2 FC Protocol

3.2.1 FC Protocol Overview
The FC protocol, also referred to as FC bus or standard bus,
is the Danfoss standard fieldbus. It defines an access
technique according to the master/slave principle for
communications via a fieldbus.
1 master and a maximum of 126 slaves can be connected
to the bus. The master selects the individual slaves via an
address character in the telegram. A slave itself can never
transmit without first being requested to do so, and direct
message transfer between the individual slaves is not
possible. Communications occur in the half-duplex mode.
The master function cannot be transferred to another node
(single-master system).
The physical layer is RS485, thus utilizing the RS485 port
built into the frequency converter. The FC protocol
supports different telegram formats:
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•
•
3.2.2 FC with Modbus RTU
The FC protocol provides access to the control word and
bus reference of the frequency converter.
The control word allows the Modbus master to control
several important functions of the frequency converter.
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•
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Function
Specify a maximum delay time between
transmitting a request and receiving a
response.
If transmission is interrupted, specify a
maximum delay time between 2 received
bytes to ensure timeout.
NOTICE
The default selection depends on the
protocol selected in
parameter 8-30 Protocol.
A short format of 8 bytes for process data.
A long format of 16 bytes that also includes a
parameter channel.
A format used for texts.
Start.
Stop of the frequency converter in various ways:
- Coast stop.
- Quick stop.
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