9 Fieldbus Communication
9.1 Brief Introduction
FcP 5020 frequency converter provides standard communication interface to re-
alize the communication between the master and slave via Modbus, Profibus,
Profinet, CANopen, Ethernet and other protocols. With the help of a PC, a PLC
or an external computer a ''single master / multiple slaves'' network control can
be realized (setting of pressure command, flow command, modification of pa-
rameters, monitoring of frequency converter running status and error messages)
to address the specific requirements of applications.
● Cycle time for command and status value exchanging is 2ms.
● Bus communication and internal ASF data communication are not
synchronized.
9.2 Frequency Converter Parameter Address
Frequency converter parameter registers correspond to the function codes one-
to-one. Reading and writing of related function codes can be achieved through
reading and writing of the contents in frequency converter parameter registers
via communication. The characteristics and scope of reading and writing func-
tion codes are in compliance with the frequency converter function code de-
scription. The address of a frequency converter parameter register is composed
of a higher byte representing the function code group and a lower byte repre-
senting the index in the group. The groups are mapped as follows:
Address high byte
0x50 0x51 0x52 0x53 0x54
Group F0 F1 F2 F3 F4
Tab. 9-1: Frequency converter parameter registers
Code Name Description Setting range
F0.20 ASF command 1 ASF control word 0...65,535
F0.21 ASF command 2 Pressure command 0.0...1,000.0 (0.0...1,000.0 bar)
F0.22 ASF command 3 Flow command 0...5,000 (0...5,000 rpm)
F0.23 ASF command 4 Reserved -
Tab. 9-2: Communication protocol
Bit Description Setting range
0 Reserved -
1 Reserved -
Bosch Rexroth AG
Fieldbus Communication
FcP 5020
76/83
DOK-RCON03-FCP5020****-QU04-EN-P
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