Danfoss VLT 5000 Profibus, VLT 5000 FLUX, VLT 6000 HVAC, VLT 8000 AQUA, VLT 5000 FLUX Profibus Operating Instructions Manual
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Operating Instructions
Profibus DP V1
VLT® 5000 / 5000 FLUX / 6000 HVAC / 8000 AQUAVLT
VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
■ Contents
Introduction
....................................................................................................... 3
About this manual ................................................................................................. 3
Assumptions ......................................................................................................... 4
Background knowledge ........................................................................................ 4
Profibus DP ........................................................................................................... 5
Baudrate ................................................................................................................ 5
Profibus DP V1 ...................................................................................................... 5
The PROFIBUS option card ....................................................................... 6
Master-controlled frequency converters ................................................................. 6
Bus topology ......................................................................................................... 7
Features of DP (Distributed Periphery) .................................................................... 7
Rapid Cyclical transmission with PPO using DP ..................................................... 7
Profibus DP V1 ...................................................................................................... 8
Principle of data exchange by Profibus DP V0/DP V1 ............................................ 8
Cable lengths and number of nodes ....................................................................... 9
Physical connection ............................................................................................... 11
Protective measures for EMC ................................................................................ 11
Cable connection FCM 300 ................................................................................... 11
Connection of the cable screening ........................................................................ 11
Earthing .................................................................................................................. 11
Bus connection ..................................................................................................... 11
Diagram bus connection ........................................................................................ 12
The PROFIBUS option card .................................................................................... 12
LEDs ..................................................................................................................... 13
Address switches .................................................................................................. 14
Frequency converter response time behaviour ....................................................... 16
Time behaviour during system update ................................................................... 16
PPO description .............................................................................................. 17
Communication connections ................................................................................. 17
PPO description (Overview) .................................................................................... 17
PCA interface .................................................................................................... 18
PCA processing .................................................................................................... 18
Parameter description ........................................................................................... 19
Spontaneous messages ............................................................................. 21
Spontaneous messages ........................................................................................ 21
SYNC and FREEZE ........................................................................................ 22
SYNC and FREEZE ............................................................................................... 22
SYNC/UNSYNC ..................................................................................................... 22
FREEZE/UNFREEZE .............................................................................................. 22
Control word/Status word .......................................................................... 23
Control word/Status word ...................................................................................... 23
Control word according to profidriveprofile ............................................................ 23
Status word according to profidriveprofile .............................................................. 25
MG.90.G1.02 - VLT is a registered Danfoss trademark
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
Control word according to fc standard .................................................................. 27
Status word according to fc standard .................................................................... 28
Bus reference value ...................................................................................... 29
Bus reference value ............................................................................................... 29
Examples ............................................................................................................ 30
Example 1: PCV Channel ...................................................................................... 30
Example 2: Process data from the frequency converter ......................................... 31
Example 3: Array treatment ................................................................................... 32
GSD file ................................................................................................................ 34
DP V1 Identifications .............................................................................................. 34
Parameters ......................................................................................................... 35
VLT frequency converter parameters ..................................................................... 35
Parameter access .................................................................................................. 42
Read/Write on VLT frequency converters ................................................................ 42
Warning and alarm messages .................................................................. 43
Warnings and alarm messages .............................................................................. 43
Spontaneous messages ........................................................................................ 43
Additional display readings .................................................................................... 43
Warning word, extended Status word and Alarm word ........................................... 44
Station address ...................................................................................................... 46
Extended Diagnosis ............................................................................................... 47
Parameter list .................................................................................................... 48
Appendix ............................................................................................................. 58
Glossar ................................................................................................................. 58
Abbreviations used ................................................................................................ 59
MG.90.G1.02 - VLT is a registered Danfoss trademark
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
Introduction
■Introduction
C
opyrights, Limitation of Liability and Revision Rights
This publication contains information proprietary to
Danfoss A/S. By accepting and using this manual the
user agrees that the information contained herein will
be used solely for operating equipment of Danfoss A/S
or equipment from other vendors provided that such
equipment is intended for communication with Danfoss
equipment over a PROFIBUS serial communication
link. This publication is protected under the Copyright
laws of Denmark and most other countries.
Danfoss A/S does not warrant that a software program
produced according to the guidelines provided in
this manual will function properly in every physical,
hardware or software environment.
Although Danfoss A/S has tested and reviewed the
documentation within this manual, Danfoss A/S makes
no warranty or representation, either express or implied,
with respect to this documentation, including its quality,
performance, or fitness for a particular purpose.
In no event shall Danfoss A/S be liable for direct,
indirect, special, incidental, or consequential damages
arising out of the use, or the inability to use information
contained in this manual, even if advised of the
possibility of such damages. In particular, Danfoss
A/S is not responsible for any costs including but not
limited to t hose incurred as a result of lost profits
or revenue, loss or damage of equipment, loss
of computer programs, loss of data, the costs to
substitute these, or any claims by third parties.
Danfoss A/S reserves the right to revi
se this publication
at any time and to make changes in its contents
without prior notice or any obligation to notify previous
users of such revisions or changes.
NB!:
Note regarding Profibus FMS
If you want to run FMS you have to
purchase as follows:
For VLT 5000:
175Z3722 (uncoated)
175Z3723 (coated)
For VLT 6000 HVAC:
175Z4207 (uncoated)
175Z4208 (coated)
It is NOT possible to run FMS from a VLT 5000
FLUX or a VLT 8000 AQUA.
This manual does not deal with Profibus FMS,
only with Profibus DP. However, in the event
thatthecommunicationistobebuiltupthrough
Profibus FMS, you should request the description
MG.10.E3.yy "Profibus Product Manual" which
also contains a description of the Profibus FMS
functions of the Profibus option card.
■About this manual
This manual is intended as both an instruction manual
and a reference guide. Itonlybroaches the basics of the
PROFIBUS DP protocol, and only when it is necessary
toprovideasufficientunderstandingofthePROFIDRIVE
implementation of the PROFIBUS profile for frequency
converters (version 2, PNO) and of the PROFIBUS
option card for the series VLT 5000/VLT 5000 Flux/VLT
6000 HVAC/VLT 8000 AQUA by DANFOSS.
Unit Software version
FCD 300 Ver. 1.30
FCM 300 VLT 2800 Ver. 2.64
VLT 5000 Ver. 3.62
VLT6000HVAC Ver. 2.41
VLT8000AQUA Ver. 1.12
The above table shows from which software versions
Profibus DP V1 is supported. The software version can
be read-out in parameter 624 Software versions.
This manual gives detailed information of the DP V0
features supported, sufficient for most programming
and maintenance activities. The DP V1 however
is briefly described. For programming purposes
the Profibus DP V1 Design Guide order number
MG.90.EX.YY (X is the version number, and YY the
language code) might be necessary.
It is suggested that readers who are not
completely familiar with PROFIBUS DP or the
profile for frequency converters review the relevant
literature on these subjects.
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
Even if you are an experienced PROFIBUS programmer,
we suggest that you read this manual in its entirety
before you start programming, since important
information can be found in all chapters.
The section Quick start deals with the quick start of the
communication parameters for the DP communication.
The chapter TheProfibusoptioncardcontains
details regarding the PROFIBUS option card and the
establishment of the physical connection.
Please refer to section Timing for information
regarding the time behaviour.
The chapter PPO description presents an overview
of the PPOs (informative data telegrams).
The PCA interface as a parameter interface in the
PPO is explained in chapter PCA interface.
Section Parameters and data type structures contains
the description of the parameter and data structure.
Chapter Spontaneous messages contains a
description of spontaneous messages.
The response to the "Sync" and "Freeze" commands
is explained in chapter SYNC and FREEZE.
The Control word and Status word as essential
elements of the PPOs for the operational Control,
as well as the bus reference value are explained
in chapter Bus reference value.
Chapter Examples contains examples for the use of
the PPOs. It is recommended that readers review the
examples for a better understanding of the PPOs.
Chapter Parameters contains the frequency converter
parameters specific to the Profibus. Warning and alarm
messages and display readings specific to the Profibus
are described in chapter Warning and alarm messages.
A parameter listing as an overview of all VLT
5000/VLT 5000 Flux/VLT 6000 HVAC/VLT 8000 AQUA
parameters can be found in chapter Parameter list.
In chapter Appendix you will find the abbreviations used
in this manual. The manual concludes with a short
glossary and a detailed index for quick navigation.
If you are interested in learning more about the
PROFIBUS protocol in general, we recommend
that you consult the relevant, very comprehensive
literature for this purpose.
■Assumptions
The manual assumes that you are using a DANFOSS
PROFIBUS DP option card, together with a DANFOSS
VLT frequency converter, that you are using a PLC or
a PC with a serial interface as master which supports
all communication services for PROFIBUS, and
that all requirements are met and all limitations are
observed which arise from the PROFIBUS standard,
the PROFIBUS profile of frequency converters, and
the company-specific implementation of PROFIDRIVE,
or those of the frequency converter drives.
The Profibus DP V1 is an extension of the former
Profibus DP V0 funcionality.
■Background knowledge
The DANFOSS PROFIBUS option card is designed for
the communication with all masters that comply with
the PROFIBUS DP V0 and DP V1 standard. Thus,
the assumption is made that you are familiar with the
PC or PLC to be used as a master on your system.
Any questions regarding the hardware or software of
other suppliers are beyond the scope of this manual
and outside the responsibility of DANFOSS.
In the event of questions concerning the configuration
of the master-to-master communication or the
configuration with a slave not manufactured by
DANFOSS, you should refer to the information
in the respective manuals.
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
Introduction
■Quick start
Details regarding the programming of t he usual
frequency converter parameters may be gathered from
the manual for the VLT 5000/VLT 5000 FLUX/VLT
6000 HVAC/VLT 8000 AQUA series.
The communication is established by setting the
parameters indicated below.
Details regarding the adjustment of the master
are provided by the master manual and by those
chapters in this manual that deal with the particulars
of the PROFIBUS interface.
NB!:
The required GSD file is available on the Inter net
at http://www.danfoss.com/drives
■Profibus DP
P
arameter 904
The desired informative data telegram (PPO) is setup
in master configuration. The actual PPO type can be
read out in P904. The master sends the PPO type in a
configuration telegram in the Profibus DP start phase.
P
arameter 918
This sets the address of the frequency converter
station – one specific address per frequency converter.
For further information, please refer to the section
Station address in this manual.
P
arameter 502 -508
By setting the parameters 502-508 you will be able
to select have to control over the bus.
P
arameter 512
AllowsthechoiceofControlword/Statuswordtype
.
For further information, please refer to the section
Control word/Status word this manual.
NB!:
In order to activate a change of parameter
918 the power of the frequency converter
must be cycled.
■Baudrate
The FCM 300, FCD 300 and VLT 2800 adjust
automatically to the Baudrate configurated
from the master.
NB!:
When configuring the PPO types, a distinction
is made between module consistency
and word consistency:
Module consistency means that a specific portion
of the PPO is defined as a connected module. The
parameter interface (PCV, length of 8 bytes) of the
PPO always has module consistency.
Word consistency means that a specific portion
of the PPO is divided into individual data sectors
of word length (16 bits).
The process data of the PPO may have either module
consistency or word consistency, as desired.
Some PLCs, such as Siemens S7, require special
functions to call modules that are longer than 4
bytes (in the case of Siemens: "SFC", see master
manual). This means that the PCV interfaces of
the PPOs can only be called through the SFC
functions in the case of Siemens (S7).
■Profibus DP V1
A detailed description of the DV V1 features supported
can be found in the "Profibus DP V1 Design
Guide" order number MG.90.EX.YY.
Further specifications might be helpful:
- Technical Guide "PROFIBUS -DP Extensions to EN
50170 (DPV1)" V2.0, April 1998, Order no. 2.082
- Draft PROFIBUS Profile PROFIDRIVE Profile Drive
Technology V3.0 September 2000, Order no. 3.172
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
■Master-controlled frequency converters
The PROFIBUS Fieldbus was designed to give you
unprecedented flexibility and command over your
controlled system. The PROFIBUS will perform as an
integrated part of your frequency converter, giving you
access to all parameters relevant to your application.
The f requency converter will always act as a slave, and
together with a master it can exchange a multitude
of information and commands. Control signals such
as speed reference, start / stop of motor, reverse
operation, etc. are transmitted from the master in
the form of a telegramme. The frequency converter
acknowledges receipt by transmitting status signals,
such as running, on reference, motor stopped and so
on to the master. The frequency converter may also
transmit fault indications, alarms and warnings to the
master, such as Overcurrent or Phaseloss.
The PROFIBUS communicates in accordance with the
PROFIBUS field bus standard, EN 50170, part 3. It
can thus exchange data with all masters that meet
this standard; however, this does not mean that all
services available in the PROFIDRIVE profile standard
are supported. The PROFIBUS profile for frequency
converters (version 2 and partly version 3, PNO) is a
part of PROFIBUS which supports only those services
that concern applications with speed control.
C
ommunication partners
In a control system the frequency converter
will always act as a slave, and as such it m
ay
communicate with a single master or multiple masters
depending on the nature of the application. A
master may be a PLC or a PC that is equip
ped
with a PROFIBUS communication card.
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
The PROFIBUS option
card
■Bus topology
S
ingle master operation with DP V0
- Single master
- PLC communicates with telegrams of
constant length
- Fits to time critical requirements
Cyclical transmission (PLC )
1. Setpoint transmission
2. Actual value feedback
3. New set points computed
4. New set point transmission
5. Parameter Read - using PCV channel
6. Parameter Write - using PCV channel
7. Read parameter description - using PCV channel
■Features of DP (Distributed Periphery)
- Is used by several PLC manufacturers for remote
peripheral I/O communication.
- Supports cyclical communication.
- SRD (Send Receive Data) service gives fast
cyclical exchange of process data between
master and slaves.
- Freeze and synchronize function is supported.
- Fixed data structure.
- Fixed telegramme size.
- Occupies I/O memory space in PLC proportional
to the number of slaves employed, which may
limit the number of participants. Additional data
require additional I/O memory space.
DP should be used when fast cyclical process control
is needed. Such a concept would typicall
y call
for single master operation with a limited number
of slave stations. A high number of slaves will
increase the system response time.
This could also be the case where control
loops are closed over the bus. As a very fast
alternativeitisofcoursepossibletoclosethe
control loop outside the bus.
■Rapid Cyclical transmission with PPO using DP Control of the drives during norma l operation is often
very time critical, but it involves very few data, such
as control commands and speed reference. DP is
optimized for fast cyclical communication.
Par
ameter up-/downloads can be achieved by
using the PCV part of the so-called Parameter Process data Objects - PPO types 1, 2 or 5, see
drawing in paragraph PPO description.
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
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■Profibus DP V1
The Profibus DP extension DP V1 offers additional
to the cyclical data communication an acyclical
communication. This feature can be used by a
DP master type 1 (e.g. PLC), as well as a DP
master type 2 (e.g. PC tool).
Features of a Master type 1 connection
- Cyclical data exchange (DP V0).
- Acyclical read/write on parameters.
The acyclical connection is fixed, and can not
be changed during operation.
Features of a Master type 2 connection:
- Initiate / Abort acyclical connection.
- Acyclical read/write on parameters.
The acyclical connection can dynamically be
established (Initiate) or removed (Abort) even when
a master class 1 is active on the network.
The DP V1 acyclical connection can be used
for general parameter access as an alternative
to the PCV parameter channel.
■PrincipleofdataexchangebyProfibusDPV0/DPV1
In a DP cycle the MC 1 will first update the cyclical
process data for all slaves in the system. After that
the MC 1 has the possibility of sending one acyclical
message to one slave. If a MC 2 is connected,
the MC 1 will handle over the Token to MC 2 who
now is aloud to send one acy clical message to one
slave. After that, the token is handled back to the
MC 1, and a new DP cycle is started.
MC1: Master Class 1
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
The PROFIBUS option
card
■Cable lengths and number of nodes
The maximum cable length of a segment depends on
the transmission speed. The total cable length includes
stub lines, if applicable. A stub line is the connection
from the main bus cable to each node if a "T"
connection exists instead of a direct connection of the
main bus cable to the nodes; cf. the stub line length.
The following table s hows the maximum permitted
cable lengths and the maximum number of nodes or
frequency converters with 1, 2, 3 or 4 bus segments.
Please note that a repeater switched between two
segments represents a node in both segments.
The number of frequency converters is based on
a system with only one master. In the case of
multiple masters, the number of frequency converters
must be reduced accordingly.
The total stub line l ength of a segment is
limited as follows:
Stub line length
Transmission speed Max. stub line length
per segment [m]
9.6-93.75 kBaud 96
187.5 kBaud 75
500 kBaud 30
1.5 MBaud 10
3-12 MBaud none
Maximum total bus cable length
Transmission speed 1 segment:
32 nodes (31
frequency converters)
[m]
2segments:
64 nodes (1 repeater,
61 frequency
converters) [m]
3segments:
96 nodes (2 repeater,
91 frequency
converters) [m]
4segments:
128nodes(3repeater,
121 frequency
converters) [m]
9.6-187.5 kBaud 1000 2000 3000 4000
500 kBaud 400 800 1200 1600
1.5 MBaud 200 400 600 800
3-12 MBaud 100 200 300 400
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
The indicated lengths in the tables are valid
on the condition that bus cables with the
following properties are used:
- Impedance: 135 to 165 Ohm at a measuring
frequency of 3 to 20 MHz
- Resistance: < 110 Ohm/km
- Capacity: < 30 pF/m
- Damping: max. 9 dB across the entire
cable length
- Cross-section: max. 0.34 mm pursuant to
AWG 22
- Wire type: twisted pair, 1 x 2 or 2 x 2 or 1
x4conductors
- Shielding copper-braided or braided and
foil laminated
It is recommended to use the same cable type
throughout the entire network in order to avoid
mismatches of the impedance.
The figures in the following description indicate the
maximum permitted number of stations in each
segment. These figures do n
ot refer to the station
addresses, since each station in the network must
have an unambiguous address.
Segment 1
Segment 2
Segment 3
Segment 4
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
The PROFIBUS option
card
■Physical connection
The PROFIBUS option card will be connected to the
bus line (data line) at terminals 62 and 63. Data line
"B" (TxD/RxD-P) will be connected to terminal 62 and
data line "A" (TxD/RxD-N) to terminal 63. A master
with a voltaically insulated bus driver and overvoltage
protection (e.g. Z diode) is recommended.
■Protective measures for EMC
It is recommended to carry out the following protective
measures for EMC in order to ensure a trouble-free
operation of the PROFIBUS network. Additional notes
concerning the subject of EMC can be found in the
project manual for the VLT 5000 series (MG.50.Cx.yy)
and in the manual for the Profibus master.
NB!:
The applicable national and local regulations,
for example with respect to protective
earthing, must be observed.
■Cable connection FCM 300
The PROFIBUS communication cable must be kept
away from motor and brake resistor cables to avoid
coupling of high frequency noise from one cable to
the other. Normally a distance of 200 mm is sufficient,
but it is generally recommended to keep the greatest
possible distance between the cables, especially where
cables are running in parallel over long dista
nces.
If the PROFIBUS cable has to cross a motor and
braking resistance cable, it should occur at a 90° angle.
■Connection of the cable screening
The shielding of the PROFIBUS cable always needs
tobeofalarge-area,low-impedancetypeonboth
sides. As a matter of principle, the screen should be
put up with a large area and low impedance at all
PROFIBUS stations. It is very important to have an
earthconnectionwithlowimpedanceevenathigh
frequencies. This can be achieved by connecting the
shield surface to earth, for example with the help of
a cable bow or a conductive cable connector.
The frequency converter is equipped with various
terminals and supports in order to provide a flawless
shielding of the PROFIBUS ca
ble. The shield
connection is shown in the following diagram.
■Earthing
It is important to connect all stations linked to the
PROFIBUS network to the same earth potential. The
earthing must have a low high-frequency impedance.
This can be achieved by connecting a protective
housing surface which is as large as possible to
earth, for example by mounting the frequency
converter to a conductive rear wall.
Especially in the case of large distances between the
stations of a PROFIBUS network, the additional use of
potential equalization cables to connect the individual
stations to the same earth potential may be necessary.
■Bus connection
62 = RxD/TxD-P red cable
63 = RxD/TxD-N green cable
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
■Diagram bus connection
It is important to terminate the bus line correctly.
Mismatches of the impedance may lead to reflections
in the line and cause incorrect transmissions.
- The PROFIBUS option card is equipped with a
suitable termination which can be activated by
theswitches1and2attheswitchblockS1
directly to the right above the terminal block
MK 1B. The bus termination is active when the
switch is in the "ON" position.
NB!:
Th
e switches must never be set in
opposite directions. Both switches must
be set to ON or OFF.
- Most masters and repeaters are equipped
with their own termination.
- If an internal termination circuit in the form of
three resistors is connected to the bus line, a
5 V direct voltage must be used. Attention:
please make sure that it is voltaically separated
from the power supply cable.
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
The PROFIBUS option
card
■The PROFIBUS option card ■LEDs
There are four LEDs on the PROFIBUS option card:
LD1 and LD4: Flickering (very rapid blinking),
when data are being exchanged
through the option card.
Comment: with each "flicker" of
the LEDs, the frequency converter
is sending a telegram.
LD2 and LD3: Shining, when the option card
is initialized and ready for the
data exchange, or when data
are already being exchanged.
Blinking, when the function
for the automatic baud rate
determination attempts to
determine the current baud rate.
Note: a faulty connection of the
data line may also cause blinking
of the LEDs. (see "Physical
connection").
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
■Address switches
The station address can be set in parameter 918
or through a hardware switch (S2, 1-4 and S3,
5-7 on the PROFIBUS option card).
The setting of an address through parameter 918 is only
possible when the address switches are set to > 125.
Each slave must have an unambiguous address.
The address is the binary value set for the switches,
cf. the table below. The modification of the address
switches occurs during the next turn-on procedure.
See also section Station Address.
Switches 1-7 (switch 8 is not used)
1234567
Addressswitchposition(1=ON,0=OFF)
00000000
11000000
20100000
31100000
40010000
51010000
60110000
71110000
80001000
91001000
100101000
111101000
120011000
131011000
140111000
151111000
160000100
171000100
180100100
191100100
200010100
211010100
220110100
231110100
240001100
251001100
260101100
271101100
280011100
291011100
300111100
311111100
320000010
331000010
Switches 1-7 (switch 8 is not used)
1234567
Address switch position (1= ON, 0=OFF)
340100010
351100010
360010010
371010010
380110010
391110010
400001010
411001010
420101010
431101010
440011010
451011010
460111010
471111010
480000110
491000110
500100110
511100110
520010110
531010110
540110110
551110110
560001110
571001110
580101110
591101110
600011110
611011110
620111110
631111110
640000001
651000001
660100001
671100001
680010001
691010001
700110001
711110001
720001001
731001001
740101001
751101001
760011001
771011001
780111001
791111001
800000101
811000101
820100101
831100101
840010101
851010101
860110101
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
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The PROFIBUS option
card
Switches 1-7 (switch 8 is not used)
1234567
Addressswitchposition(1=ON,0=OFF)
871110101
880001101
891001101
900101101
911101101
920011101
931011101
940111101
951111101
960000011
971000011
980100011
991100011
1000010011
1011010011
1020110011
1031110011
1040001011
1051001011
1060101011
1071101011
1080011011
1091011011
1100111011
1111111011
1120000111
1131000111
1140100111
1151100111
1160010111
1171010111
1180110111
1191110111
1200001111
1211001111
1220101111
1231101111
1240011111
1251011111
1260111111
1271111111
MG.90.G1.02 - VLT is a registered Danfoss trademark
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
■Timing
■Frequency converter response time behaviour
The period for the update through the PROFIBUS
connection can be subdivided into two portions:
1. The communication period, i.e. the time required
to transmit data from the master to the slave
(frequency converter with PROFIBUS option), and
2. the internal update period, i.e. the time required
to transmit data between the frequency converter
control card and t he PROFIBUS option card.
The communication period (t
com
) depends on the
respective transmission speed (baud rate) and the
type of master being used. The shortest achievable
communication period is approximately 30 msec
per slave with the frequency converter PROFIBUS
option when DP communication with a data quantity
of 4 bytes (PPO type 3) at 12 Mbaud is used.
The communication period increases with more
data or lower transmission speeds.
The internal update period (t
int
) depends on the
respective data as there are different channels
for the transmission of data, with time-critical
data, such as the Control word, being given the
highest priority. The internal update time for the
respective data types is listed below.
Data Update time,
t
int
Control word/main reference
value (Part of PPO)
2msec.
Status word/respective output
frequency (Part of PPO)
2msec.
Parameter Read (PCD 1-8) 2 msec.
Parameter Write (PCD 1-2) 40 msec.
Parameter Write (PCD 3-4) 80 msec.
Parameter Write (PCD 5-8) 160 msec.
Parameter Read (PCV) 20 msec.
Parameter Write (PCV) 20 msec.
Acyclical data (read, write) 20 msec.
■Time behaviour during system update
Thesystemupdateperiodisthetimerequired
to update all slaves of the network when cyclical
communication is used.
The update time of a single slave is composed of both
the communication period (depending on the baud
rate) and the station delay (TSDR) in the slave, and of
the delay in the master associated with the station.
The station delay (TSDR) is the delay time from the
moment when a station receives the last bit of a
telegram to the moment when it sends the first bit
of the next telegram. The station delay is defined by
two parameters: the minimum station delay (TSDR
min
)
and the maximum station delay (TSDR
max
).
Current station delay for the PROFIBUS option:
-DP:11bittimes
Current master station delay:
- This information must be provided by the
manufacturer of the respective PROFIBUS master.
Example
- DP master with 1.5 MBaud and PPO type
3 (4 byte data); the assumption here is for 50
bit times as master TSDR.
Time [msec] Action
0 Master starts data transmission
Last bit received in slave
Slave station delay
Slave starts data transmission
Last bit received in master
Master station delay
(50 bit times » 0.033)
Master ready for data transmission
to next slave
MG.90.G1.02 - VLT is a registered Danfoss trademark
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VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
PPO
description
■Communication connections
Communication pursuant to PROFIBUS DP , i.e.
EN50170 part 3, is supported.
Accordingly, a master must be used that
supports PROFIBUS DP.
■PPO description (Overview)
A feature of the PROFIBUS profile for frequency
converters is a communications object designated as
"PPO", i.e. "parameter process data object".
All cyclical informative data are transmitted via PPOs.
Thus, PPOs form the framework for the data traffic.
One of the PPOs described in the following must be
used in the case of DP communication.
The actual PPO type can be readout in parameter 904.
A PPO may consist of a parameter portion and
a process data portion. The parameter portion
may be used for reading and/or updating of
parameters (successively).
The process data portion consists of a fixed part
(4 bytes) and a parameterizable part (8 or 16
bytes). The Control word and speed reference
value are transmitted to the frequency converter
in the fixed portion, whereas the Status word
and current output frequency are transmitted by
the frequency converter. In the parameterizable
portion, the user selects which parameters are to be
transmitted to the frequency converter (parameter
915) and which are to be transmitted by the
frequency converter (parameter 916).
P
PO, Parameter Process Data Object
PDC: Process Data
PCV: Parameter-Characteristics-Value
PCA: Parameter-Characteristics (Bytes 1, 2)
PCA handling see section Examples
IND: Subindex (Byte 3)m (Byte 4 is not used)
PVA: Parameter value (Bytes 5 to 8)
CTW: Control
word
STW: Status
word
See section Examples
MRV: Main reference value
MAV: Main actual value (Actual output
frequency)
MG.90.G1.02 - VLT is a registered Danfoss trademark
17
VLT® 5000/ 5000 FLUX/ 6000 HVAC/
8000 AQUA PROFIBUS
■PCA processing
The master controls and monitors frequency converter
parameters through the PCA portion of the PPOs
type 1, 2 and 5 and requests a response from
the frequency converter (slave). In addition to the
parameter processing, the frequency converter can
also transmit a spontaneous message.
Requests and responses involve an acknowledgement
exchange (a so-called handshake) which cannot be
worked off in stack operation. This means that the
master, when sending a read/write request, must wait
for the response before sending a new request. A
request or response is limited to a maximum of 4
bytes, i.e. no text strings can be transmitted.
PCA - Parameter description
15 14 13 12 11 109876543210
RC MSP PNU
RC: Request/Response
Characteristics
(Sector: 0-15)
SPM: Toggle bit for spontaneous
messages
PNU: Parameter Number (Sector: 1-990)
Request and response
In the RC portion of the PCA word the requests of the
mastertotheslavearetriggered.TheothertwoPCV
fields IND and PVA must be evaluated as well.
The PVA po
rtion transmits parameter values in
word size with the bytes 7 and 8; double words
require the bytes 5-8, i.e. 32 bits.
If the request or response contains array elements,
thearraysubindexwillbeinIND(byte3). In
the event of a parameter description, IND
contains the record subindex.
RC content
Request Function
0Norequest
1 Request parameter value
2 Change parameter value (word)
3 Change parameter value (double word)
4 Request description element
5 Change description element
6 Request parameter value (array)
7 Change parameter value (array word)
8 Change parameter value (array double
word)
9 Request number of array elements
10-15 Not assigned
Response
Function
0Noresponse
1 Transmit parameter value (word)
2 Transmit parameter value (double
word)
3 Transmit description element
4 Transmit parameter value (array word)
5 Transmit parameter value (array double
word)
6 Transmit number of array elements
7 Request not executable (with error
number, see below)
8 No operating authority for PCV
interface
9 Spontaneous message (word)
10 Spontaneous message (double word)
11 Spontaneous message (array word)
12 Spontaneous message (array double
word)
13-15 Not assigned
If a request from the master is not executed by the
slave, the RC word in the PPO-Read has the value 7.
The errornumber is in bytes 7 and 8 of the PVAelement.
Error no. Meaning
0
1 Parameter value not changeable
2 Upperorlowervaluepassed
3Faultysubindex
4Noarray
5 Wrong data type
6 Setting not permitted (resettable only)
7 Description element not changeable
8 NoPPO-WriteforIR
9 Description data not available
10 Access group
11 No parameter operating authority
12 Keyword missing
13 Text not readable in cyclical traffic
14 Name not readable in cyclical traffic
15 Text array not available
16 PPO-Write missing
17 Request temporarily unexecutable
18 Other error
19 Data not readable in cyclical traffic
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