BACnet CFW-11 User manual

Motors I Automation I Energy I Transmission & Distribution I Coatings
BACnet
CFW-11
User’s Manual

BACnet User’s Manual
Series: CFW-11
Language: English
Document Number: 10000831662 / 02
Publication Date: 11/2012

Contents
CFW-11 | 3
CONTENTS
CONTENTS ...............................................................................................................................3
ABOUT THE MANUAL.............................................................................................................5
ABBREVIATIONS AND DEFINITIONS........................................................................................... 5
NUMERICAL REPRESENTATI ON ................................................................................................ 5
DOCUMENTS............................................................................................................................ 5
1INTRODUCTION TO THE SERIAL COMMUNICATION ................................................6
2BACNET COMMUNICATION ACCESSORY...................................................................7
2.1 RS485.............................................................................................................................. 7
2.1.1 RS485-01 Kit.............................................................................................................. 7
2.1.2 CAN/RS485-01 Kit ...................................................................................................... 7
2.1.3 Connector Pinout....................................................................................................... 7
2.1.4 Indications and Switches............................................................................................ 8
2.1.5 Connection with the RS485 Network........................................................................... 8
2.2 A NY BU S-CC .................................................................................................................... 8
3INTRODUCTION TO THE BACNET COMMUNICATION ..............................................9
3.1 BACNET MS/TP.............................................................................................................. 10
3.1.1 BACnet M S/ TP M es sag e Str u ct u r e............................................................................ 10
3.2 ADDRESS ...................................................................................................................... 12
3.3 BA CN ET P ROFILE .......................................................................................................... 12
3.3.1 ReadProperty (DS-RP -B) .......................................................................................... 12
3.3.2 Writ ePropert y (D S-WP-B).......................................................................................... 12
3.3.3 WHO IS / I AM (DM-DDB-B)....................................................................................... 12
3.3.4 Device Management-Time Synchronization-B (DM-TS-B) ........................................... 12
3.3.5 Device Management-Reinitialize Device-B (DM-RD -B) ............................................... 12
4INVERTER PROGRAMMING..........................................................................................13
4.1 SYMBOLS FOR THE PROPERTIES DESCRIPTION ............................................................ 13
P0105 – 1ST/2ND RA MP S EL E CT I ON ............................................................................................ 13
P0220 – LOCAL/REMOTE SELECTION SOURCE........................................................................ 13
P0221 – SPEED REFERENCE SELECTION – LOCAL SITUATION.................................................. 13
P0222 – SPEED REFERENCE SELECTION – REMOTE SITUATION............................................... 13
P0223 – FORWARD/REVERSE SELECTION – LOCAL SITUATION ................................................ 13
P0224 – RUN /STOP SELECTION – LOCAL SITUATION................................................................ 13
P0225 – JOG SEL ECTION – L OCAL SITUATION.......................................................................... 13
P0226 – FORWARD/REVERSE SELECTION – REMOTE SITUATION ............................................. 13
P0227 – RUN /STOP SELECTION – REMOTE SITU ATION............................................................. 13
P0228 – JOG SEL ECTION – REM OT E SIT UA TI ON ....................................................................... 13
P0308 – SERIAL ADDRESS ....................................................................................................... 13
P0310 – SERIAL BAUD RATE .................................................................................................... 14
P0311 – SERIAL INTERFACE BYTE CONFIGURATION ................................................................ 14
P0312 – SERIAL PROTOC OL..................................................................................................... 14
P0313 – COMMUNICATION ERROR ACTION.............................................................................. 15
P0314 – SERIAL WATCHDOG.................................................................................................... 15
P0316 – SERIAL INTERFACE STATUS ....................................................................................... 16
P0680 – STATUS WORD ........................................................................................................... 16
P0681 – MOTOR SPEED IN 13 BITS........................................................................................... 18
P0682 – SERI AL C ON T ROL WORD ............................................................................................ 18
P0683 – SERIAL SPEED REFERENCE........................................................................................ 19
P0696 – VALU E 1 FOR ANAL OG OUTPUTS ................................................................................ 20

Contents
CFW-11 | 4
P0697 – VALU E 2 F O R ANALOG OUTPUTS ................................................................................ 20
P0698 – VALU E 3 FOR ANAL OG OUTPUTS ................................................................................ 20
P0699 – VALU E 4 FOR ANAL OG OUTPUTS ................................................................................ 20
P0760 – BACNET EQUIPMENT INSTANCE – HI GH P A RT............................................................. 21
P0761 – BACNET EQUIPMENT INSTANCE – L OW P A RT ............................................................. 21
P0762 – MAXIMUM MASTER NUMBER...................................................................................... 22
P0763 – MAXIMUM NUMBER OF MS/TP FRAMES...................................................................... 22
P0764 – I AM TRANSMISSION................................................................................................... 23
P0765 – NUMBER OF RECEIVED TOKENS................................................................................. 23
5BACNET OBJECT MODELING ......................................................................................24
5.1 ANALOG INPUT (ANI) OBJEC T ........................................................................................ 25
5.2 ANALOG OU TP UT (AN O) OBJEC T ................................................................................... 25
5.3 ANALOG VALUE (ANV) OBJECT ...................................................................................... 25
5.3.1 MBOX...................................................................................................................... 26
5.4 BINARY INPUT (BIN) OBJEC T ......................................................................................... 26
5.5 BINARY OUTPUT (BOUT) OBJECT................................................................................... 27
5.6 BINARY VALUE (BV) OBJ EC T.......................................................................................... 27
5.7 DEVICE OBJECT ............................................................................................................ 28
6FAULTS AND ALARMS RELATED TO THE SERIAL COMMUNICATION.................29
A128/F228 – TIMEOUT FOR SERIAL COMMUNICATION ............................................................. 29

About the Manual
CFW-11 | 5
ABOUT THE MANUAL
The BACnet communication protocol is available in the CFW-11 frequency inverter special software version (Ve)
3.3x. This version is derived from the standard version 3.1X, with the following modifications:
The CANopen, Profibus and DeviceNet communication protocol has been removed;
The BACnet MS/TP and SymbiNet communication protocol has been added.
This manual provides the necessary information for the operation of the CFW-11 frequency inverter using the
BACnet protocol. This manual must be used together with the CFW-11 user manual.
ABBREVIATIONS AND DEFINITIONS
ASCII
American Standard Code for Information Interchange
PLC
Programmable Logic Controller
HMI
Human-Machine Interface
ro
Read-only
rw
Read/write
NUMERICAL REPRESENTATION
Decimal numbers are represented by means of digits without suffix. Hexadecimal numbers are represented with
the letter ‘h’ after the number.
DOCUMENTS
The BACnet protocol for the CFW-11 was developed based on the following specifications and documents:
Documen t
Version
Source
Standard 135-2004
1.0
ANSI/ASHRAE/ISO
In order to obtain this documentation, consult BACnet ORG, witch is the organization that currently maintains,
publishes and updates the information regarding the BACnet network.

Introduction to the Serial Communication
CFW-11 | 6
1INTRODUCTION TO THE SERIAL COMMUNICATION
In a serial interface, the data bits are sent sequentially through a communication channel, or busbar. Several
technologies use serial communication for data transfer, including the RS232 and RS485 interfaces.
The standards that specify the RS232 and RS485 interfaces, however, do specify neither the format nor the
character sequence for data transmission and reception. In this sense, besides the interface, it is also necessary
to identify the protocol used for the communication.
The BACnet MS/TP network defines the BACnet message exchange using the RS485 interface as the physical
layer.
The characteristics of the RS485 serial interfaces available in the CFW-11 frequency inverter, as well as the
BACnet protocol, will be presented next.

BACnet Communication Accessory
CFW-11 | 7
2BACNET COMMUNICATION ACCESSORY
In order to make a BACnet interface available for the CFW-11 frequency inverter, it is necessary to use one of
the RS485 communication kits described next. Information on the installation of these modules in the frequency
inverter can be obtained in the guide that comes with the kit.
2.1 RS485
The CFW-11 presents two options for using the RS485 interface, described next.
2.1.1 RS485-01 Kit
WEG part number: 10051957.
Composed by the RS48
5 communication module (drawing at the
left), mounting instructions and fixing screw.
The interface follows the EIA-485 standard.
It allows baud rates from 9600 bits/s to 57600 bit/s.
The interface is electrically isolated and with differential signal, which
grants more robustness against electromagnetic interference

It allows the connection of up to 32 devices to the same segment.
More devices can be connected by using repeaters.1

A maximum bus length of 1000 meters.
2.1.2 CAN/RS485-01 Kit
WEG part number: 10051960.
Composed by the CAN/RS485-01 communication module (drawing
at the left), mounting instruction and fixing screw.
It has the same characteristics as the RS485-
01 interface, plus a
CAN interface, for applications where the operation with both
interfaces is necessary.
2.1.3 Connector Pinout
The RS485 communication module presents a 4-wire plug-in terminal strip (XC7) with the following pinout:
Table 2.1: 4-wire RS485 terminal strip pinout
Terminal
Name
Function
1
A-Line (-)
RxD/TxD negative
2
B-Line (+)
RxD/TxD positive
3
GND
0V isolated from the RS485
circuit
4
Ground
Terra (shield)
1 The limit number of devices that can be connected to the network depends also on the used protocol.

BACnet Communication Accessory
CFW-11 | 8
2.1.4 Indications and Switches

TX LED:
LED for the indication of data transmission by the
frequency inverter, in green color.

Termination resistor (S1):
switch for enabling the termination
resistor, necessary for the RS485 interface. This resistor must be
enabled (position ON) only at the devices located at the extremes
of the main bus.
2.1.5 Connection with the RS485 Network
The following points must be observed for the connection of the frequency inverter using the RS485 interface:
It is recommended the use of a shielded cable with a twisted pair of wires.
It is also recommended that the cable has one more wire for the connection of the reference signal (GND).
In case the cable does not have the additional wire, then the GND signal must be left disconnected.
The cable must be laid separately (and far away if possible) from the power cables.
All the network devices must be properly grounded, preferably at the same ground connection. The cable
shield must also be grounded.
Enable the termination resistors only at two points, at the extremes of the main bus, even if there are
derivations from the bus.
2.2 ANYBUS-CC
The RS485 interface can also be made available by using the passive Anybus-CC kit available for RS485. Refer
to the Anybus-CC Communication Manual for information on this kit.

Introduction to the BACnet Communication
CFW-11 | 9
3INTRODUCTION TO THE BACNET COMMUNICATION
BACnet, acronym for "Building Automation Control Network", is a protocol defined by the ANSI/ASHRAE/ISO
Standard 135-2004. The protocol defines a model for building-automation, describing the interaction between
devices and systems. The protocol defines:
Data and commands structured in an object-oriented model;
Services that describe the access to data;
A flexible network architecture.
The BACnet standard defines six types of communication networks for transporting BACnet messages, as
showed in the Figure 3.1. The type of network defines the physical and data link layers. The six types of
networks are:
BACnet ARCnet;
BACnet Ethernet;
BACnet Lontalk;
BACnet MS/TP;
BACnet Point-to-Point;
BACnet IP;
Figure 3.1: BACnet protocol architecture
A BACnet equipment contains an information collection defined as objects and properties.
A BACnet object represents physical or virtual information of the equipment, as a digital or analog input, control
variables and parameters. The BACnet standard defines 25 types of objects. Each object is identified by a
propriety called Object Identifier, which codifies the object instance type in a 32-bit binary number.
A BACnet property represents characteristics or information of a BACnet object. It is through the properties that
other elements can access the equipment information. The property access can be defined as read-only or
writing/reading. The BACnet specification defines services that are grouped in five categories:
Object access
Device Management
Alarm and event
File transfer
Virtual terminal
BACnet equipments can be classified in six different profiles according to the set of services made available:
BACnet Operator Workstation (B-OWS)
BACnet Building Controller (B-BC)
BACnet Advanced Application Controller (B-AAC)
BACnet Application Specific Controller (B-ASC)
BACnet Smart Actuator (B-AS)
BACnet Smart Sensor (B-SS)

Introduction to the BACnet Communication
CFW-11 | 10
3.1 BACNET MS/TP
In the CFW-11, the BACnet protocol was developed using the RS485 standard for the physical and data link
layers, called BACnet MS/TP (Master Slave/Token Passing). BACnet MS/TP nodes can be divided into two
groups, master nodes and slave nodes, according to the node address range.
The access control to the communication mean is performed in two ways:

Master/Slave (MS):
It is used in the communication between a master node and a slave node;

Token passing (TP)
: Communication only among master nodes. A logical ring is defined and the master
that has the token can establish communication with slave nodes and other masters.
In a BACnet MS/TP network, the nodes are initialized and enter the IDLE state, waiting for the arrival of a
telegram, which can be:
Invalid frame: it remains in IDLE;
Not desired frame: it remains in IDLE;
Token: it enters the USE TOKEN state, executes the necessary communication (with slaves or other
masters) and passes the token to the next node;
Reception of a Poll of Master: it sends a telegram to the node with the address in the Source Address field;
Reception of a DataNoReplay: it signalizes the reception to the higher layers;
Reception of a DataNeedingReplay: it signalizes the reception to the higher layers and sends the requested
response.
3.1.1 BACnet MS/TP Message Structure
The BACnet specification defines that the frame can have from 0 up to 501 bytes (octets), and that each byte is
composed by 8 bits without parity, with start and stop bits, as showed in the Figure 3.2.
Figure 3.2: Byte structure
Reception (RX):
The maximum time between bytes (Tframegap) is of 20-bit times, and the minimum time
between frames (Tturnaround) after the last byte stop bit is of 40-bit times, according to the Figure 3.3.
Transmission (TX):
The RTS signal must be disabled after the end of the stop bit time (Tpostdrive), which is of
15-bit times.
Figure 3.3: BACnet data reception
Header and data, as Figure 3.4 illustrates, form the BACnet data frame.