Communication Via Bacnet Ms/Tp - Siemens SINAMICS G120 Original Instructions Manual

Configuring the fieldbus
7.6 Communication via RS485
7.6.4

Communication via BACnet MS/TP

BACnet properties
In BACnet, components and systems are considered to be black boxes which contain a
number of objects. BACnet objects only stipulate the behavior outside the device, BACnet
sets no internal functions.
A range of object types and their instances represent one component.
Each BACnet device has precisely one BACnet device object. An NSAP (Network Service
Access Point - comprising network number and MAC address; MAC: Medium Access
Control) uniquely identifies a BACnet device. This address is BACnet-specific and must not
be confused with the Ethernet MAC address.
Data exchange with the client
The inverter receives control commands and setpoints via service instructions from the
control and transmits its status back to the control. The inverter can also send telegrams
automatically itself, respectively execute services, e.g. I-Am.
Communication settings
● The Control Unit supports BACnet via RS485 (BACnet MS/TP),
● Communication supports Unicode, coded with the character set UTF-8
● The maximum cable length is 1200 m (3281 ft).
Protocol Implementation Conformance Statement
You will find the Protocol Implementation Conformance Statement (PICS) in the Internet
under the following link: BACnet files
(http://support.automation.siemens.com/WW/view/en/38439094)
Note
It is not permitted to change over the units
The "Unit changeover (Page 267)" function is not permissible with this bus system!
172
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG