
Configuring the fieldbus
6.2 Communication via RS485
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
144
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
6.2.4.1
Setting the address
You can define the MAC ID of the inverter using DIP switches on the Control Unit or using
p2021.
Valid BACnet addressing range: 1 … 127
If you specify the address using the DIP switch, then this address is always effective and
p2021 cannot be changed.
If you want to specify the address using p2021, we recommend setting all the DIP switches
to "OFF" (0).
The positions and settings of the DIP switches are described in Section Interfaces,
connectors, switches, control terminals, LEDs on the CU (Page 46).
CAUTION
A bus address that has been changed is only effective after switching-off and switching-on
again. It is particularly important that any external 24 V supply is switched off.
6.2.4.2
Basic settings for communication
P no.
Parameter name
P0015 = 21
Macro drive unit
Selecting the I/O configuration
p2030 = 5
Fieldbus telegram selection
5: BACnet
p2020
Baud rate
6: 9600 (factory setting)
7: 19200
8: 38400
10: 76800
p2024[0 … 2]
Processing times
P2024 [0]: 0 ms … 10000 ms, maximum processing time (APDU timeout), factory
setting = 1000 ms,
P2024 [1 … 2]: No significance for BACnet
p2025[0…3]
BACnet communication parameter
•
p2025 [0]: 0 … 4194303, Device object instance number,
Factory setting = 1
•
p2025 [1]: 1 … 10, Maximum Info Frames, factory setting = 1
•
p2025 [2]: 0 … 99, Number of APDU Retries (repeated attempts after fault
telegrams), factory setting = 3
•
p2025 [3]: 1 … 127, maximum Master address, factory setting = 127
Summary of Contents for SINAMICS G120 CU230P-2
Page 2: ......