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78
10.12 FIELDBUS PARAMETERS (CONTROL PANEL: MENU PAR -> S2)
SmartVFD COMPACT has a built-in Modbus RTU bus interface. The signal level of
the interface is in accordance with the RS-485 standard.
The built-in Modbus connection of SmartVFD COMPACT supports the following
function codes:
Function
code
03
04
06
10.12.1 Termination resistor
The RS-485 bus is terminated with termination resistors of 120 ohms in both ends.
SmartVFD COMPACT has a built-in termination resistor which is switched off as a
default (presented below). The termination resistor can be switched on and off with
the right hand dip switch located above IO-terminals in the front of the drive (see be-
low).
AI2 GND GND DI4 DI5 DI6 AO DO
4
1
+10V AI1 GND 24V GND DI1 DI2 DI 3
10.12.2 Modbus address area
The Modbus interface of SmartVFD COMPACT uses the ID numbers of the applica-
tion parameters as addresses. The ID numbers can be found in the parameter tables
in chapter 9. When several parameters/monitoring values are read at a time, they
must be consecutive. 11 addresses can be read and the addresses can be parame-
ters or monitoring values.
10
Parameter Descriptions
Function name
Read Holding Registers
Read Input Registers
Preset Single Registers
5
13
14
15
16
2
3
6
7
8
mA
V
Address
All ID numbers
All ID numbers
All ID numbers
RO1 RO1
22
23
18
20
9
10
A
ON
120
OFF
Honeywell
Broadcast mes-
sages
No
No
Yes
-
RO2
26
25
24
B
RO2
RO2
= A PI R S-4 85
+
= API LIMITED
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