10/05 AWB8230-1541GB
Parameter settings for Modbus
149
Table 38: PIN allocation, RJ 45 (RS 485)
Parameter settings for Modbus
Prerequisites for correct operation with Modbus-RTU are:
• The PLC (master) is fitted with a serial interface RS 485 and with
the required driver software for Modbus-RTU.
• The parameters of the DF51 frequency inverters (slaves) are set
for communication via Modbus. For reliable setting of some
user-defined parameters, you will need the master’s (i.e. the
host PC’s) settings, such as the baud rate.
Table 39: Required parameter settings
Pin Name Description
1 – Not connected
2 – Not connected
3 – Not connected
4 – Not connected
5 SP Send/receive, positive data channel
6 SN Send/receive, negative data channel
7 – Not connected
8 – Not connected
1
2
3
4
5
6
7
8
h
Parameters PNU C071 to C078 can not be altered
through the bus. They must be initially set using a keypad
(DEX-KEY-…) or a PC.
h
The values in the “Required settings” column (such as
baud rate, bus address and parity) must be taken into
account for communications through Modbus.
PNU Run b031
= 10
Function Value range DS page Required settings
A001 – – Reference value source
selection
00: Potentiometer (keypad) 01 03
01: Analog input: Control signal
terminals O and OI
02: Digital input (function PNU F001
or A020) and keypad
03: Serial interface (Modbus)
10: Calculator (calculated value of
CAL)
A002 – – Start signal source
selection
01: Digital input (FWD/REV) 01
03
02: START button (keypad)
03: Serial interface (Modbus)
b089 jj Indication, value on
mains operation
(RS 485)
01: Output frequency (d001) 01
02: Output current (d002)
03: Direction of rotation (d003)
04: Actual value (PV) (d004)
05: State of digital inputs (d005)
06: State of digital outputs (d006)
07: Scaled output frequency (d007)
C071 – j Communication – baud
rate
04: 4800 bit/s 06 Dependent on the setting of
the PLC (master) setting
05: 9600 bit/s
06: 19200 bit/s
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