Serial interface (Modbus)
10/05 AWB8230-1541GB
150
Setting the OPE/485 DIP switch
By default, the DF51 frequency inverters ’s RS 485 interface is set
for operation with a keypad (DEX-KEY-…). In this control mode,
you can set parameters PNU C071 to C078 for bus operation using
a keypad (OPE) or a PC. To save these changes, press the ENTER
key on the keypad or use the Save command of the DrivesSoft
software.
X To set up the interface for communications through Modbus,
switch off the power supply.
X Set the microswitch OPE/485 to position 485.
With this setting, Modbus communications begin when the DF51
frequency inverter’s power supply is switched on (POWER LED is
lit). The changed parameter values apply immediately.
C072 – j Communication –
address
1 – 32 1 Individual address in
network.
Each address must be
unique.
C074 – j Communication – parity 00: None 00
Dependent on the PLC
(master)
01: Even
02: Odd
C075 – j Communication – stop
bits
1: 1 bit 1 Dependent on the PLC (host,
master)
2: 2 bits
C076 – j Communication:
Behaviour of frequency
inverter on
communication errors
00: Switch off on fault signal E60 02 Individual
01: Decelerate to standstill at
deceleration ramp and then
switch off with error E60.
02: No fault signal
03: FRS: Free run stop (free coasting,
= controller inhibit)
04 DEC: Braking to 0 Hz at set
deceleration ramp
C077 – j Communication – set
monitoring time
(watchdog).
0 – 99.99 s 0.00
Individual
C078 – j Communication –
waiting time (latency
between request and
response)
0 – 1000 ms 0 Individual
PNU Run b031
= 10
Function Value range DS page Required settings
Figure 155:Microswitch OPE/485
SR
SK
485
OPE
TM
PRG
I
O
K12 K14 K11
AM
H
O
OI
L
L 5
4 3 2 1
P24
CM2
12 11
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