78
Parameter Descriptions
Honeywell
10
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:
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).
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.
Function
code
Function name
Address
Broadcast mes-
sages
03
Read Holding Registers
All ID numbers
No
04
Read Input Registers
All ID numbers
No
06
Preset Single Registers
All ID numbers
Yes
ON
OFF
4
5
13
14
15
16
20
18
1
2
3
6
7
8
9
10
22
23
26
A
B
24
25
AI2 GND GND DI4 DI5 DI6 AO DO
RO1 RO1
RO2
RO2
RO2
+10V AI1 GND 24V GND DI1 DI2 DI3
-
= A PI R S-4 85
= API LIMITED
mA
V
120
+
