Fuji Electric FRENIC-AQUA series User manual

24A7-E-0021

RS-485 Communication User's Manual

Copyright © 2012 Fuji Electric Co., Ltd.
All rights reserved.
No part of this publication may be reproduced or copied without prior
written permission from Fuji Electric Co., Ltd.
All products and company names mentioned in this manual are trademarks
or registered trademarks of their respective holders.
The information contained herein is subject to change without prior notice
for improvement.

i
Preface
Using the RJ-45 connector (modular jack) designed for keypad connection or the control circuit
terminal block on the inverter unit enables functionality expansion for RS-485 communication. The
RJ-45 connector also makes it possible to operate the keypad at a remote site.
This manual describes the functionality expansion. For the handling of the inverter, refer to the User's
Manual and Instruction Manual of the inverter.
Read through this manual and become familiar with the handling procedure for correct use. Improper
handling may result in malfunction, a shorter service life, or even a failure of this product.
The tables below list the relevant documents. Use them according to your purpose.
FRENIC-HVAC
Name Document number Description
User's Manual MEHT537
Overview of FRENIC-HVAC, how to operate the
keypad, control block diagrams, selection of
peripherals, capacity selection, specifications, function
codes, etc.
Catalog 24A1-E-0012 Overview of FRENIC-HVAC, features, specifications,
outline drawings, options, etc.
Instruction Manual INR-SI47-1610-E
Inspection at the time of product arrival, installation
and wiring, how to operate the keypad,
troubleshooting, maintenance and inspection,
specifications, etc.
FRENIC-AQUA
Name Document number Description
User's Manual MEHT538
Overview of FRENIC-AQUA, how to operate the
keypad, control block diagrams, selection of
peripherals, capacity selection, specifications, function
codes, etc.
Catalog 24A1-E-0013 Overview of FRENIC-AQUA, features, specifications,
outline drawings, options, etc.
Instruction Manual INR-SI47-1611-E
Inspection at the time of product arrival, installation
and wiring, how to operate the keypad,
troubleshooting, maintenance and inspection,
specifications, etc.
These documents are subject to revision as appropriate. Obtain the latest versions when using the
product.

ii
 Safety Precautions
Prior to installation, connection (wiring), operation, maintenance or inspection, read through this user's
manual as well as the instruction and installation manuals to ensure proper operation of the product.
Familiarize yourself with all information required for proper use, including knowledge relating to the
product, safety information, and precautions.
This user's manual classifies safety precautions as shown below according to the severity of the
accident that may occur if you fail to observe the precaution:
Failure to heed the information indicated by this symbol may lead to
dangerous conditions, possibly resulting in death or serious bodily injuries.
Failure to heed the information indicated by this symbol may lead to
dangerous conditions, possibly resulting in minor or light bodily injuries
and/or substantial property damage.
Failure to heed the information contained under the CAUTION title can also result in serious
consequences. These safety precautions are of utmost importance and must be observed at all times.
The FRENIC-HVAC/AQUA is not designed for use in appliances and machinery on which lives
depend. Consult Fuji before considering the FRENIC-HVAC/AQUA series of inverters for equipment
and machinery related to nuclear power control, aerospace uses, medical uses or transportation.
When the product is to be used with any machinery or equipment on which lives depend or with
machinery or equipment which could cause serious loss or damage should this product malfunction
or fail, ensure that appropriate safety devices and/or equipment are installed.
Wiring
- Before starting wiring, confirm that the power is turned OFF (open).
An electric shock may result.
- The product cannot be connected directly to an RS-232C interface of a computer.
- When connecting a device cable to the RJ-45 connector (modular jack, designed for keypad
connection), confirm the wiring of the device beforehand.
The RJ-45 connector has the pins connected to the keypad power supply (pins 1, 2, 3, 7 and 8).
When connecting the inverter with a device such as other inverters via a communications cable,
take care not to connect the wiring of the device to those pins assigned to the power supply. For
details, refer to Chapter 2, Section 2.2 "Connections."
- When the inverter is connected with the FVR-E11S series, a power short-circuit or a collision of
signal lines may occur, resulting in a damaged inverter. For details, refer to Chapter 2, Section
2.2.2 "Connection notes."
Failure may result.
Operation
- Never reset an alarm state with a run command being ON (closed). Doing so may cause the
inverter to supply power to the motor so that the motor runs.
An accident may result.

iii
Chap. 1 Chap. 2 Chap. 3 Chap. 4 Chap. 5 Chap. 6 Chap. 7
Table of Contents
CHAPTER 1 OVERVIEW
1.1 Features ................................................................................................................................... 1-1
1.2 List of Functions ....................................................................................................................... 1-3
CHAPTER 2 COMMON SPECIFICATIONS
2.1 Specifications of RS-485 Communications .............................................................................. 2-1
2.1.1 RJ-45 connector (modular jack) specifications ................................................................ 2-3
2.1.2 Terminal block specifications ........................................................................................... 2-4
2.1.3 Connection cable specifications....................................................................................... 2-5
2.2 Connections ............................................................................................................................. 2-6
2.2.1 Basic connection.............................................................................................................. 2-6
2.2.2 Connection notes ........................................................................................................... 2-10
2.2.3 Connection devices........................................................................................................ 2-13
2.2.4 Measures against noise ................................................................................................. 2-14
2.3 Switching to Communications ................................................................................................ 2-16
2.3.1 Functions for the switching ............................................................................................ 2-16
2.3.2 Link functions (Mode selection) ..................................................................................... 2-17
2.3.3 How to switch communications enabled/disabled ......................................................... 2-18
2.3.4 Loader link functions (Mode selection) .......................................................................... 2-19
2.4 Making RS-485-related Settings ............................................................................................ 2-20
2.4.1 Link function (RS-485 setting)........................................................................................ 2-20
2.5 Selecting Data Clear Processing for Communications Error ................................................. 2-23
CHAPTER 3 Modbus RTU PROTOCOL
3.1 Messages ................................................................................................................................. 3-1
3.1.1 Message formats.............................................................................................................. 3-1
3.1.2 Message types................................................................................................................. 3-1
3.1.3 Message frames .............................................................................................................. 3-2
3.1.4 Message categories......................................................................................................... 3-4
3.1.5 Communications examples............................................................................................ 3-12
3.2 Host Side Procedures ............................................................................................................3-13
3.2.1 Inverter's response time................................................................................................. 3-13
3.2.2 Timeout processing........................................................................................................ 3-14
3.2.3 Receiving preparation complete time and message timing from the host..................... 3-15
3.2.4 Frame synchronization method...................................................................................... 3-15
3.3 Communications Errors.......................................................................................................... 3-16
3.3.1 Categories of communications errors ............................................................................ 3-16
3.3.2 Operations in case of errors........................................................................................... 3-17
3.4 CRC-16 .................................................................................................................................. 3-20
3.4.1 Overview of the CRC-16 ................................................................................................ 3-20
3.4.2 Algorithm........................................................................................................................ 3-20
3.4.3 Calculation example....................................................................................................... 3-22
3.4.4 Frame length calculation................................................................................................ 3-23

iv
CHAPTER 4 FUJI GENERAL-PURPOSE INVERTER PROTOCOL
4.1 Messages ................................................................................................................................. 4-1
4.1.1 Message formats.............................................................................................................. 4-1
4.1.2 Transmission frames........................................................................................................ 4-2
4.1.3 Descriptions of fields...................................................................................................... 4-11
4.1.4 Communications examples............................................................................................ 4-13
4.2 Host Side Procedures ............................................................................................................4-15
4.2.1 Inverter's response time................................................................................................. 4-15
4.2.2 Timeout processing........................................................................................................ 4-16
4.2.3 Receiving preparation complete time and message timing from the host ..................... 4-16
4.3 Communications Errors.......................................................................................................... 4-17
4.3.1 Categories of communications errors ............................................................................ 4-17
4.3.2 Communications error processing ................................................................................. 4-18
CHAPTER 5 FUNCTION CODES AND DATA FORMATS
5.1 Communications Dedicated Function Codes........................................................................... 5-1
5.1.1 About communications dedicated function codes............................................................ 5-1
5.1.2 Command data................................................................................................................. 5-2
5.1.3 Monitor data 1 ................................................................................................................ 5-11
5.1.4 Information displayed on the keypad ............................................................................. 5-16
5.2 Data Formats.......................................................................................................................... 5-32
5.2.1 List of data format numbers ........................................................................................... 5-32
5.2.2 Data format specifications.............................................................................................. 5-56
CHAPTER 6 Metasys N2 (N2 PROTOCOL)
6.1 Messages ............................................................................................................................... 6-56
6.1.1 Communications specifications...................................................................................... 6-56
6.1.2 Polling/selecting ............................................................................................................. 6-56
6.2 Setting up the FRENIC-HVAC/AQUA .................................................................................... 6-56
6.3 Point Mapping Tables............................................................................................................. 6-56
6.4 Reading and Writing from/to Function Codes ........................................................................ 6-56
6.5 Support Command Lists......................................................................................................... 6-56
CHAPTER 7 BACnet MS/TP
7.1 Messages ............................................................................................................................... 7-56
7.1.1 Communications specifications...................................................................................... 7-56
7.2 Setting up the FRENIC-HVAC/AQUA .................................................................................... 7-56
7.3 Binary Point Table .................................................................................................................. 7-56
7.4 Analog Point Table ................................................................................................................. 7-56
7.5 Reading and Writing from/to Function Codes ........................................................................ 7-56

CHAPTER 1
OVERVIEW
This chapter describes the functions that can be realized by performing RS-485 communications.
Table of Contents
1.1 Features ................................................................................................................................... 1-1
1.2 List of Functions ....................................................................................................................... 1-3

1.1 Features
1-1
Chap. 1 OVERVIEW
1.1 Features
The functions listed below can be implemented using RS-485 communications.
- The keypad can be mounted on the easy-to-access front of control panel with an extension
cable (option).
- The function code data of the inverter can be edited and the operation status of the inverter
can be monitored by connecting it to a personal computer on which inverter support software
runs (see the "FRENIC Loader Instruction Manual").
- The inverter can be controlled as a subordinate device (slave) by connecting it to an upper
level device (host (master)) such as a PLC or personal computer.
As the communications protocols for controlling inverters, the Modbus RTU widely used by a
variety of appliances, and the Fuji general-purpose inverter protocol common to Fuji's inverters
are available. In addition, in the FRENIC-HVAC/AQUA, the Metasys N2 and BACnet are also
available.
Modbus RTU protocol
The Modbus RTU protocol is a set of communications specifications defined to connect Modicon's
PLCs (Programmable Logic Controllers) in a network. A network is established between PLCs or
between a PLC and another slave unit(s) (inverter(s), etc.). The main functions include:
- supporting both a query-response format and a broadcast format for messages.
- enabling the host unit as the master to transmit queries to each inverter as a slave, and each
slave to send back responses to the queries to the master.
- supporting two modes, RTU mode and ASCII mode, as a transmission mode for the
standard Modbus Protocol. The FRENIC series supports the RTU mode only, which provides
a high transmission density.
- performing an error check through a CRC (cyclic redundancy check) to ensure accurate data
transmission.
Fuji general-purpose inverter protocol
This protocol is commonly used for all models of Fuji's general-purpose inverters. The main
functions include:
- enabling, as a common protocol, operation of all models of Fuji's general-purpose inverters
with the same host program (function codes cannot be generally edited because
specifications are different among models).
- adopting fixed-length transmission frames as standard frames to facilitate developing
communications control programs for hosts.
- reducing the communications time in response to operation commands and frequency
setting which are required quick response by using optional transmission frames.
Metasys N2 protocol
This protocol is to interface with Metasys systems developed by Johnson Controls. For details
about the Metasys N2, refer to the documents issued by Johnson Controls.
BACnet protocol
BACnet refers to the Building Automation and Control Network protocol defined by ASHRAE. It
is to interface with systems conforming to BACnet.

1-2
- Since the protocol switches to the keypad dedicated protocol automatically by
connecting the keypad, it is not necessary to set up the communications-related
functions.
- Although the FRENIC Loader uses a dedicated protocol for loader commands, part o
f
the communications conditions must be set. (For further information, see the
"FRENIC Loader Instruction Manual.")

1.2 List of Functions
1-3
Chap. 1 OVERVIEW
1.2 List of Functions
The functions listed below become available by operating the appropriate function codes from
the host controller.
The chapters that follow describe these functions in detail.
Table 1.1 List of RS-485 communications functions
Function Description
Related
function
code
Operation The functions equivalent to the terminal functions shown below can be
executed through communications:
- Forward operation command "FWD" and reverse operation
command "REV"
- Digital input commands ([FWD], [REV], [X1]-[X7] terminals)
(The number of X terminals varies with the inverter model.)
- Alarm reset command (RST)
Frequency
setting
Either of the following three setting methods can be selected:
- Set up as "±20000/maximum frequency."
- Frequency (in units of 0.01 Hz) without polarity
- Rotation speed (in units of 1 min-1) with polarity
PID command - Set up as "±20000/100%."
Commands to external PID1 to PID3 can be set.
Clock data - Year, month, day, hour, minute and second can be set.
S codes
(dedicated
to
communica-
tions)
Operation
monitor
The items below can be monitored:
- Frequency command
- Actual values (frequency, current, voltage, etc.)
- Operation status, information on general-purpose output terminals,
etc.
Maintenance
monitor
The items below can be monitored:
- Cumulative operation time, DC link bus voltage
- Information to determine the service life of parts to be periodically
replaced (main circuit capacitor, PC board capacitor, cooling fan)
- Model codes, capacity codes, ROM version, etc.
Alarm monitor The items below can be monitored:
- Monitoring alarm history (last nine alarms)
- Monitoring information when an alarm occurs (last four alarms)
Operation information (output/set frequencies, current, voltage, etc.)
Operation status, information on general-purpose output terminals
Maintenance information (cumulative operation time, DC link bus
voltage, heat sink temperature, etc.)
M codes
W codes
X codes
Z codes
(dedicated
to
communica-
tions)
Function code All types of function code data can be monitored and changed. All function
codes other
than above

1-4

CHAPTER 2
COMMON SPECIFICATIONS
This chapter describes the specifications common to the Modbus RTU protocol, Fuji general-purpose
inverter protocol, Metasys N2, BACnet, and loader protocol. For further information about the specific
specifications of each protocol, see Chapter 3 "Modbus RTU Protocol" and Chapter 4 "Fuji
General-purpose Inverter Protocol."
Table of Contents
2.1 Specifications of RS-485 Communications .............................................................................. 2-1
2.1.1 RJ-45 connector (modular jack) specifications ................................................................ 2-3
2.1.2 Terminal block specifications ........................................................................................... 2-4
2.1.3 Connection cable specifications....................................................................................... 2-5
2.2 Connections ............................................................................................................................. 2-6
2.2.1 Basic connection.............................................................................................................. 2-6
2.2.2 Connection notes ........................................................................................................... 2-10
2.2.3 Connection devices........................................................................................................2-13
2.2.4 Measures against noise ................................................................................................. 2-14
2.3 Switching to Communications................................................................................................ 2-16
2.3.1 Functions for the switching ............................................................................................ 2-16
2.3.2 Link functions (Mode selection) ..................................................................................... 2-17
2.3.3 How to switch communications enabled/disabled ......................................................... 2-18
2.3.4 Loader link functions (Mode selection) .......................................................................... 2-19
2.4 Making RS-485-related Settings ............................................................................................ 2-20
2.4.1 Link function (RS-485 setting)........................................................................................ 2-20
2.5 Selecting Data Clear Processing for Communications Error ................................................. 2-23

2.1 Specifications of RS-485 Communications
2-1
Chap. 2 COMMON SPECIFICATIONS
2.1 Specifications of RS-485 Communications
Table 2.1 shows the specifications of RS-485 communications.
Table 2.1 RS-485 communications specifications
Item Specification
Protocol FGI-BUS Modbus RTU Loader commands
Complying with Fuji general-purpose
inverter protocol
Modicon Modbus
RTU-compliant (only in
RTU mode only)
Special commands
dedicated to inverter
support loader software
(not disclosed)
No. of supporting
stations
Host device: 1
Inverters: up to 31
Physical level EIA /RS-485
Connection to
RS-485
Connect using the RJ-45 connector or terminal block
Synchronization
method of character
Start-Stop system
Transmission mode Half-duplex
Transmission speed
(bps)
2400, 4800, 9600, 19200 and 38400
Maximum
transmission cable
length
500 m
No. of available
station addresses
1 to 31 1 to 247 1 to 255
Message frame
format
FGI-BUS Modbus RTU Loader command
Synchronization
method of
transmission frames
Detection SOH (Start Of
Header) character
(SOH 01H)
Detection of no-data
transmission time for 3
byte period
Start code 96H
detection
Frame length Normal transmission:
16 bytes (fixed)
High-speed transmission:
8 or 12 bytes
Variable length Variable length
Maximum transfer
data
Write: 1 word
Read: 1 word
Write: 50 words
Read: 50 words
Write: 41 words
Read: 41 words
Messaging system Polling/Selecting/Broadcast Command message
Transmission
character format
ASCII Binary Binary
Character length 8 or 7 bits (selectable by
the function code)
8 bits (fixed) 8 bits (fixed)
Parity Even, Odd, or None (selectable by the function
code)
Even
Stop bit length 1 or 2 bits (selectable by
the function code)
No parity: 2 bits
Even or Odd parity:
1 bit
1 bit (fixed)
Error checking Checksum CRC-16 Checksum

2-2
Table 2.1 RS-485 communications specifications (continued)
Item Specification
Protocol Metasys N2 BACnet
Complying with Metasys N2 developed by Johnson
Controls
ANSI/ASHRAE Standard 135-1995
No. of supporting
stations
Host device: 1
Inverters: up to 31
Physical level EIA RS-485
Connection to
RS-485
Connect using the RJ-45 connector or terminal block
Synchronization
method of character
Start-Stop system
Transmission mode Half-duplex
Bus topology Master-Slave Master-Slave/Token Passing (MS/TP)
Maximum
transmission cable
length
9600 9600, 19200 and 38400
Maximum
transmission cable
length
500 m
No. of available
station addresses
1 to 255 0 to 127
Message frame
format
Metasys N2 BACnet
Synchronization
method of
transmission frames
Timing-synchronization
Frame length Variable 501 octets max.
Messaging system Polling/Selecting/Broadcast
Transmission
character format
ASCII, 7 bits fixed
Character length 8 bits (fixed)
Parity No parity (fixed)
Stop bit length 1 bit (fixed)
Error checking Checksum CRC
Table 2.2 Connection method and applicable protocol for FRENIC series
Applicable protocol *1
Model
Communi-
cations
means
Connection
port
Hardware
specifications
for
connection
port
Port type Keypad
*2 Loader Modbus
RTU
Fuji general-
purpose
inverter
protocol
Metasys
N2 BACnet
Keypad
connection
connector on
inverter unit
RJ-45
connector
See Section
2.1.1.
Standard
port √√√√√√
FRENIC-
HVAC/
AQUA Control circuit
terminal block
on inverter
unit
Ter mi nal
block
See Section
2.1.2.
Extension
port -- √√√√√
*1 Metasys N2 or BACnet cannot operate both the standard and extension ports at the same time.
*2 Only the dedicated keypad can be connected to the FRENIC-HVAC/AQUA.

2.1 Specifications of RS-485 Communications
2-3
Chap. 2 COMMON SPECIFICATIONS
2.1.1 RJ-45 connector (modular jack) specifications
The table below lists the pin assignment of the RJ-45 connector (modular jack, designed for
keypad connection).
Pin No. Signal name Function Remarks
1, 8 Vcc Power source for the keypad 5V
2, 7 GND Reference voltage level Ground (0 V)
3 RES Reserved
(Connect nothing to this pin.) −
6 NC No connection −
4 DX- RS-485 communications data (-)
5 DX+ RS-485 communications data (+)
A terminating resistor of 112is
incorporated. Connection/cut off
is selected by a switch*1.
*1 For the details of the terminating resistor insertion switch, refer to Section 2.2.2 "Connection
notes, [2] "About terminating resistors."
- The RJ-45 connector has the pins connected to the keypad power supply (pins 1, 2, 3, 7
and 8). When connecting the inverter with a device such as other inverters via a
communications cable, take care not to connect the wiring of the device to those pins
assigned to the power supply. Connect nothing to pin 3.
- When the inverter is connected with the FVR-E11S series, a power short-circuit or a
collision of signal lines may occur, resulting in a damaged inverter. For details, refer to
Section 2.2.2 "Connection notes."
Failure may result.

2-4
2.1.2 Terminal block specifications
The terminal for RS-485 communications port 2 is provided in the control circuit terminals of the
inverter. The table below shows the code, name, and function of each terminal. These terminals
can be easily connected with the multi-drop circuit.
Terminal
symbol Terminal name Function description
DX+ RS-485 communications data (+) terminal --
DX- RS-485 communications data (-) terminal --
SD Communications cable shield terminal This is the terminal for relaying the shield of the
shielded cable, insulated from other circuits.
Internal
switch
Terminating resistor switching A terminating resistor of 112is incorporated.
Connection/release is switched by this switch*.
* For details of the terminating resistor insertion switch, see Section 2.2.2 "Connection notes, [2]
About terminating resistors."

2.1 Specifications of RS-485 Communications
2-5
Chap. 2 COMMON SPECIFICATIONS
2.1.3 Connection cable specifications
[ 1 ] RJ-45 connector
The specification of the connection cable is as follows to ensure the reliability of connection.
Specifications
Common specifications Straight cable for 10BASE-T/100BASE-TX, satisfying the US
ANSI/TIA/EIA-568A category 5 standard (commercial LAN
cable)
Extension cable for remote
operations (CB-5S)
Same as above, 8-core, 5 m long, RJ-45 connector (both
ends)
Extension cable for remote
operations (CB-3S)
Same as above, 8-core, 3 m long, RJ-45 connector (both
ends)
Extension cable for remote
operations (CB-1S)
Same as above, 8-core, 1 m long, RJ-45 connector (both
ends)
To connect a keypad, use an 8-core straight cable. Use an extension cable for remote
operations (CB-5S, CB-3S, or CB-1S) or a commercial LAN cable (20m max.).
Recommended LAN cable
Maker: Sanwa Supply (JAPAN)
Type: KB-10T5-01K (1 m)
KB-STP-01K (1-m shielded cable: Compliant with EMC Directives)
[ 2 ] Cable specifications for connection with terminals
To secure the reliability in connection, use the twisted pair shielded cable AWG16 to 26 for
long-distance transmission.
Recommended cable
Maker: Furukawa Electric's AWM2789 long-distance cable
Type(Product code): DC23225-2PB