Anybus CompactCom 40 Modbus-TCP Installation and maintenance instructions

Anybus
®CompactCom™40
PROFIBUS DP-V0/DP-V1
NETWORK GUIDE
HMSI-27-210-EN 2.3 ENGLISH

Important User Information
Liability
Every care has been taken in the preparation of this document. Please inform HMS Industrial Networks AB of any
inaccuracies or omissions. The data and illustrations found in this document are not binding. We, HMS Industrial
Networks AB, reserve the right to modify our products in line with our policy of continuous product development.
The information in this document is subject to change without notice and should not be considered as a commit-
ment by HMS Industrial Networks AB. HMS Industrial Networks AB assumes no responsibility for any errors that
may appear in this document.
There are many applications of this product. Those responsible for the use of this device must ensure that all the
necessary steps have been taken to verify that the applications meet all performance and safety requirements in-
cluding any applicable laws, regulations, codes, and standards.
HMS Industrial Networks AB will under no circumstances assume liability or responsibility for any problems that
may arise as a result from the use of undocumented features, timing, or functional side effects found outside the
documented scope of this product. The effects caused by any direct or indirect use of such aspects of the product
are undefined, and may include e.g. compatibility issues and stability issues.
The examples and illustrations in this document are included solely for illustrative purposes. Because of the many
variables and requirements associated with any particular implementation, HMS Industrial Networks AB cannot as-
sume responsibility for actual use based on these examples and illustrations.
Intellectual Property Rights
HMS Industrial Networks AB has intellectual property rights relating to technology embodied in the product de-
scribed in this document. These intellectual property rights may include patents and pending patent applications in
the USA and other countries.
Anybus®CompactCom™40 PROFIBUS DP-V0/DP-V1 Network Guide HMSI-27-210-EN 2.3

Anybus®CompactCom™40 PROFIBUS DP-V0/DP-V1 Network Guide HMSI-27-210-EN 2.3
Table of Contents Page
1 Preface ............................................................................................................................... 5
1.1 About this document ......................................................................................................5
1.2 Related Documents .......................................................................................................5
1.3 Document History ..........................................................................................................5
1.4 Document Conventions ..................................................................................................5
1.5 Document Specific Conventions......................................................................................6
1.6 Abbreviations ................................................................................................................6
1.7 Trademark Information ...................................................................................................6
2 About the Anybus CompactCom 40 PROFIBUS DPV1/DPV0 .............................. 8
2.1 General.........................................................................................................................8
2.2 Features .......................................................................................................................8
3 Fieldbus Conformance and Certification.................................................................. 9
3.1 Fieldbus Conformance Notes..........................................................................................9
3.2 Certification ...................................................................................................................9
4 Basic Operation............................................................................................................. 10
4.1 General Information .....................................................................................................10
4.2 Communication Settings............................................................................................... 11
4.3 Device Identity.............................................................................................................12
4.4 Data Exchange............................................................................................................13
4.5 Parameterization Data Handling....................................................................................14
4.6 Configuration Data Handling .........................................................................................15
4.7 Set Slave Address .......................................................................................................18
4.8 Parameter Read/Write with Call ....................................................................................18
4.9 Identification & Maintenance (I&M) ................................................................................21
5 Diagnostics..................................................................................................................... 23
5.1 Standard Diagnostics ...................................................................................................23
5.2 Additional Diagnostics Information ................................................................................23
6 Anybus Module Objects .............................................................................................. 24
6.1 General Information .....................................................................................................24
6.2 Anybus Object (01h) ....................................................................................................25
6.3 Diagnostic Object (02h) ................................................................................................26
6.4 Network Object (03h) ...................................................................................................28
6.5 Network Configuration Object (04h)...............................................................................30
6.6 PROFIBUS DP-V0 Diagnostic Object (10h) ...................................................................32

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Table of Contents
7 Host Application Objects ............................................................................................ 34
7.1 General Information .....................................................................................................34
7.2 Modular Device Object (ECh)........................................................................................35
7.3 PROFIBUS DP-V1 Object (FDh) ...................................................................................36
A Categorization of Functionality ................................................................................. 41
A.1 Basic...........................................................................................................................41
A.2 Extended.....................................................................................................................41
B Implementation Details................................................................................................ 42
B.1 SUP-Bit Definition ........................................................................................................42
B.2 Anybus State Machine .................................................................................................42
B.3 Watchdog Behavior (Application Stopped) .....................................................................42
C Error Handling................................................................................................................ 43
C.1 Translation of Anybus Error Codes ................................................................................43
C.2 Other Errors ................................................................................................................43
D GSD File Customization .............................................................................................. 44
D.1 General.......................................................................................................................44
D.2 Device Identification.....................................................................................................44
D.3 Supported Hardware Features ......................................................................................45
D.4 Supported DP Features................................................................................................46
D.5 Supported Baud Rates .................................................................................................46
D.6 Maximum Responder Time for Supported Baud Rates....................................................47
D.7 Maximum Polling Frequency.........................................................................................47
D.8 I/O Related Keywords ..................................................................................................47
D.9 Definition of Modules....................................................................................................48
D.10 Parameterization Related Keywords..............................................................................53
D.11 Diagnostic Related Keywords .......................................................................................54
D.12 Identification & Maintenance Related Keywords .............................................................54
D.13 Status Diagnostics Messages .......................................................................................55
D.14 DP-V1 Related Keywords .............................................................................................56
D.15 Alarm Related Keywords ..............................................................................................56
E Technical Specification ............................................................................................... 57
E.1 Front View...................................................................................................................57
E.2 Functional Earth (FE) Requirements..............................................................................58
E.3 Power Supply ..............................................................................................................58
E.4 Environmental Specification..........................................................................................59
E.5 EMC Compliance.........................................................................................................59

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Table of Contents
F Timing & Performance ................................................................................................. 60
F.1 General Information .....................................................................................................60
F.2 Internal Timing.............................................................................................................60
G Backward Compatibility .............................................................................................. 62
G.1 Initial Considerations....................................................................................................62
G.2 Hardware Compatibility ................................................................................................62
G.3 General Software.........................................................................................................68
G.4 Network Specific — PROFIBUS....................................................................................70

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Preface 5 (72)
1 Preface
1.1 About this document
This document is intended to provide a good understanding of the functionality offered by the
Anybus CompactCom 40 PROFIBUS DPV1/DPV0. The document describes the features that
are specific to Anybus CompactCom 40 PROFIBUS DPV1/DPV0. For general information re-
garding Anybus CompactCom, consult the Anybus CompactCom design guides.
The reader of this document is expected to be familiar with high level software design and com-
munication systems in general. The information in this network guide should normally be suffi-
cient to implement a design. However if advanced PROFIBUS specific functionality is to be
used, in-depth knowledge of PROFIBUS networking internals and/or information from the offi-
cial PROFIBUS specifications may be required. In such cases, the persons responsible for the
implementation of this product should either obtain the PROFIBUS specification to gain suffi-
cient knowledge or limit their implementation in such a way that this is not necessary.
For additional related documentation and file downloads, please visit the support website at
www.anybus.com/support.
1.2 Related Documents
Document Author Document ID
Anybus CompactCom 40 Software Design Guide HMS HMSI-216–125
Anybus CompactCom M40 Hardware Design Guide HMS HMSI-216–126
Anybus CompactCom B40 Design Guide HMS HMSI-27-230
Anybus CompactCom Host Application Implementation
Guide
HMS HMSI-27-334
PROFIBUS Profile Guidelines Part 1: Identification & Main-
tenance Functions
PNO
Specification for PROFIBUS Device Description and Device
Integration Volume 1: GSD (order. no. 2.122)
PNO
1.3 Document History
Version Date Description
1.00 2014-03-25 First official revision
1.10 2014-04-28 Added information on DP-V0
1.20 2014-08-11 Major updates
1.30 2015-11-13 Minor updates
2.0 2017-01-04 Moved from FM to DOX, M12 connectors added, misc. updates
2.1 2017-02-24 Minor corrections
2.2 2017-07-10 Added appendix on backward compatibility
Minor correction
2.3 2018-05-28 Misc. corrections
1.4 Document Conventions
Ordered lists are used for instructions that must be carried out in sequence:
1. First do this
2. Then do this
Unordered (bulleted) lists are used for:
• Itemized information
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Preface 6 (72)
• Instructions that can be carried out in any order
...and for action-result type instructions:
► This action...
➨leads to this result
Bold typeface indicates interactive parts such as connectors and switches on the hardware, or
menus and buttons in a graphical user interface.
Monospaced text is used to indicate program code and other
kinds of data input/output such as configuration scripts.
This is a cross-reference within this document: Document Conventions, p. 5
This is an external link (URL): www.hms-networks.com
This is additional information which may facilitate installation and/or operation.
This instruction must be followed to avoid a risk of reduced functionality and/or
damage to the equipment, or to avoid a network security risk.
Caution
This instruction must be followed to avoid a risk of personal injury.
WARNING
This instruction must be followed to avoid a risk of death or serious injury.
1.5 Document Specific Conventions
• The terms “Anybus” or “module” refers to the Anybus CompactCom module.
• The terms “host” or “host application” refer to the device that hosts the Anybus.
• Hexadecimal values are written in the format NNNNh or 0xNNNN, where NNNN is the hex-
adecimal value.
• A byte always consists of 8 bits.
• The terms “basic” and “extended” are used to classify objects, instances and attributes.
1.6 Abbreviations
Abbreviation Meaning
API assigned packet interval
RPI requested packet interval
T target (in this case the module)
O origin (in this case the master)
1.7 Trademark Information
Anybus®is a registered trademark of HMS Industrial Networks AB.
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Preface 7 (72)
All other trademarks are the property of their respective holders.
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2 About the Anybus CompactCom 40 PROFIBUS
DPV1/DPV0
2.1 General
The Anybus CompactCom 40 PROFIBUS DPV1/DPV0 communication module provides instant
PROFIBUS conformance tested connectivity via the patented Anybus CompactCom host inter-
face. Any device that supports this standard can take advantage of the features provided by the
module, allowing seamless network integration regardless of network type.
This product conforms to all aspects of the host interface for Anybus CompactCom 40 modules
defined in the Anybus CompactCom 40 Hardware and Software Design Guides, making it fully
interchangeable with any other device following that specification. Generally, no additional net-
work related software support is needed, however in order to be able to take full advantage of
advanced network specific functionality, a certain degree of dedicated software support may be
necessary.
2.2 Features
• Supports PROFIBUS DP-V1 and DP-V0
• PROFIBUS connector (9-pin female D-Sub) or M12 connectors
• Automatic baud rate detection
• Max. read process data: 244 bytes
• Max. write process data: 244 bytes
• Max. process data (read + write, in bytes): 488 bytes
• Generic and PROFIBUS specific diagnostic support
• User Parameterization Data support
• Set Slave Address support
• ADI access via DP-V1 read/write services
• Device identity customization
• Example GSD file provided
• Support for Modular Device Mode
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3 Fieldbus Conformance and Certification
3.1 Fieldbus Conformance Notes
Using the GSD file supplied by HMS Industrial Networks AB, the module is precertified for net-
work compliance. However, since parameter changes which require deviations from the stand-
ard GSD file are necessary, a recertification is advised, though not mandatory.
For further information, please contact HMS Industrial Networks AB.
3.2 Certification
The following items are necessary to perform to obtain a certification:
Change PNO Ident Number:
The PNO Ident Number can be requested from PNO (PROFIBUS Nutzerorganisation e.V.). Re-
place the default PNO Ident Number with this. This is done by implementing the PROFIBUS
DP-V1 object (FDh), instance #1, attribute #1, and returning the PNO Ident Number when re-
ceiving a Get_Attribute request.
Add Node Address Information:
If the host application does not set a valid node address by messaging the Network Configura-
tion Object (04h), instance 1 (“Node Address”), the PROFIBUS Set Slave Address (SSA) serv-
ice is enabled.
If SSA functionality is enabled, it is mandatory to provide a mechanism for resetting the node
address to its default value (126). This is because it is possible to lock the value from the net-
work side. See Set Slave Address, p. 18 for more information.
Change Manufacturer Id, Order Id, serial number and revision information:
This is done by implementing the PROFIBUS DP-V1 object (FDh), instance #1, attributes #8 -
#12, and returning the corresponding attributes when receiving a Get_Attribute request.
The Manufacturer Id can be requested from PNO (PROFIBUS Nutzerorganisation e.V.).
Modify the GSD file:
Modify the PROFIBUS DP-V1 GSD file so that it corresponds to the changes made above.
In addition, all modules used in the application must be defined in the GSD file. For more infor-
mation, see Configuration Data Handling, p. 15.
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4 Basic Operation
4.1 General Information
4.1.1 Software Requirements
No additional network support code needs to be written in order to support the Anybus Com-
pactCom 40 PROFIBUS DPV1/DPV0, however certain restrictions must be taken into account:
• Due to the nature of the PROFIBUS networking system, at least one ADI must be mapped
to Process Data.
• Only ADIs with instance numbers less than 65026 can be accessed acyclically from the
network.
• The host application must be able to provide a response to an ADI request within the time
period specified by the GSD file (DP-V1 Related Keywords, p. 56, “C1_Response_Time-
out”), or the master will terminate the connection and reparameterize the slave. The default
value for this parameter (i.e. the time specified by the example GSD file supplied by HMS
Industrial Networks AB) is 1 (one) second.
• The order in which ADIs are mapped to Process Data is significant and must be replicated
in the PROFIBUS master when setting up the network communication (i.e. the I/O modules
must be set up in the same order, and with the same size and direction, as the mapped
ADIs). If not taken into account, the network connection establishment will fail and no com-
munication will take place.
• The use of advanced PROFIBUS specific functionality may require in-depth knowledge in
PROFIBUS networking internals and/or information from the official PROFIBUS specifica-
tion (IEC 61158). In such cases, the ones responsible for the implementation of this product
should either obtain the PROFIBUS specification to gain sufficient knowledge or limit their
implementation is such a way that this is not necessary.
4.1.2 Support for DP-V1 and DP-V0
The Anybus CompactCom PROFIBUS module supports both DP-V1 and DP-V0. At delivery
the default settings give full DP-V1 functionality. However the PROFIBUS network master can
choose to limit the functionality to DP-V0 via the parametrization telegrams during startup.
4.1.3 Electronic Data Sheet (GSD)
On PROFIBUS, the characteristics of a device is stored in an ASCII data file with the suffix GSD.
This file is used by the PROFIBUS configuration tool when setting up the network.
HMS Industrial Networks AB provides an example GSD file, which corresponds to the default
settings in the module. However, due to the flexible nature of the Anybus CompactCom con-
cept, it is possible to alter the behavior of the product in a way that invalidates the example
GSD file.
The example GSD file supports full DP-V1 functionality, another GSD file is needed if the mod-
ule is to run only DP-V0 functionality.
See also...
•Fieldbus Conformance Notes, p. 9
•GSD File Customization, p. 44
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4.2 Communication Settings
Network related communication settings are grouped in the Network Configuration Object (04h).
Node Address:
See Network Configuration Object (04h), p. 30 for more information
Baud Rate:
The baud rate is detected automatically by the module. The following baud rates are supported:
• 9.6 kbps
• 19.2 kbps
• 45.45 kbps
• 93.75 kbps
• 187.5 kbps
• 500 kbps
• 1.5 Mbps
• 3 Mbps
• 6 Mbps
• 12 Mbps
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4.3 Device Identity
By default, the Anybus CompactCom module appears as a generic HMS Industrial Networks
AB device with the following network identity:
Vendor Name “HMS Industrial Networks”
Model Name “Anybus CompactCom 40 DP-V1”
Ident Number 1815h
It is possible to customize the network identity information so that the Anybus module appears
as a vendor specific implementation rather than a generic HMS Industrial Networks AB product.
The PROFIBUS I&M-functionality (Identification & Maintenance) provides a standard way of
gathering information about an I/O device. The I&M information is accessed by the master by
means of the Call State Machine using DP-V1 read/write services.
By default, Anybus module supports I&M records 0... 4 for slot #0 (which is the device itself).
Optionally, the host application can implement the commands Get_IM_Record and Set_IM_Re-
cord’-commands (PROFIBUS DP-V1 Object (FDh), p. 36) to support all I&M records for all slots.
See also...
• PROFIBUS Profile Guidelines Part 1: Identification & Maintenance Functions
•Network Configuration Object (04h), p. 30
•PROFIBUS DP-V1 Object (FDh), p. 36
– Attribute #1, PNO Ident Number
– Command details for Get_IM_Record
– Command details for Set_IM_Record
•Device Identification, p. 44
•Identification & Maintenance Related Keywords, p. 54
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4.4 Data Exchange
4.4.1 Application Data Instances (ADIs)
ADIs can be accessed acyclically from the network using DP-V1 read/write services. The mod-
ule translates these services into object requests towards the Application Data Object. If the
host application responds with an error to such a request, the error code in the response will be
translated to DP-V1 standard.
If the Modular Device Object is implemented in the application, the addressing of ADIs is carried
out in accordance with the Modular Device Object. For more information, see Modular Device
Object (ECh), p. 35. If the Modular Device Object is not implemented, ADIs are mapped to slots
and indexes as follows:
Correlation:
ADI = slot • 255 + index + 1
slot = (ADI - 1) / 255
index = (ADI - 1) MOD 255
Examples:
ADI Slot Index
256 1 0
510 1 0
65025 254 254
The length parameter in the DP-V1 request specifies the number of bytes to read/write.
• When reading more data than the actual size of the ADI, the response will only contain the
actual ADI data, i.e. no padding on the data is performed by the module.
• When reading less data than the actual size of the ADI, only the requested amount of data
is returned by the module.
• The maximum ADI data size that can be accessed is 240 bytes for acyclic DP-V1 read/
writes and 234 bytes for acyclic read/writes using the call service.
• When writing to an ADI, the length parameter is not checked by the module, i.e. the host
application must respond with an error if the length differs from the actual size of the re-
quested ADI.
Due to technical reasons, it is generally not recommended to use ADI numbers 1... 255 since this
may cause trouble with certain PROFIBUS configuration tools.
See also..
•GSD File Customization, p. 44
•Implementation Details, p. 42
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4.4.2 Process Data
Mapping an ADI to Write Process Data results in PROFIBUS input data, and mapping an ADI to
Read Process Data results in PROFIBUS output data. If the host application tries to map more
data than PROFIBUS permits, the module will go into the EXCEPTION state (exception code
06h) after “Setup Complete”.
See also..
•GSD File Customization, p. 44
•PROFIBUS DP-V1 Object (FDh), p. 36
4.5 Parameterization Data Handling
4.5.1 General Information
The master identifies itself to the slaves by sending Parameterization Data, specifying how the
slave shall operate (i.e. Master address, PNO-ID, Sync/Freeze capabilities etc.).
DP Standard
Parameters
DP-V1 Status Bytes User Parameterization Data
Size 7 bytes 3 bytes Dynamic
Defined by IEC IEC Host application
Evaluated by Module Module Host application
Supported in the example
HMS GSD file
Yes Yes No
User Parameterization Data is not supported by default. Optionally, User Parameterization Data
can be supported by implementing the attribute Parameterization Data (#2) in the PROFIBUS
DP-V1 Object (FDh). In such case, the example GSD file supplied by HMS must be modified.
The maximum amount of User Parameterization Data that can be handled by the module is 234
bytes.
See also...
•GSD File Customization, p. 44
•PROFIBUS DP-V1 Object (FDh), p. 36(Attribute #2, Parameterization Data)
•Parameterization Related Keywords, p. 53
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4.5.2 Validation
The User Parameterization Data must be evaluated by the host application. This is handled
through the attribute Parameterization Data (#2) in the PROFIBUS DP-V1 Object (FDh), p. 36..
Attribute Parameterization Data not implemented
If the Parameterization Data contains any User Parameterization Data, the module will reject
the Parameterization Data.
Attribute Parameterization Data implemented
The application must evaluate the contents of the attribute and provide a suitable response.
• To accept the Parameterization Data, respond with no error code.
• To reject the Parameterization Data, respond with one of the following error codes:
– NOT_ENOUGH_DATA
– TOO_MUCH_DATA
– OUT_OF_RANGE
4.6 Configuration Data Handling
4.6.1 General Information
The Anybus module determines its Expected Configuration Data based on the ADI mapping
process. Alternatively, it can be specified by the host application by implementing the Get serv-
ice of the attribute configuration Data (#3) in the PROFIBUS DP-V1 Object (FDh), p. 36.
Implementing this attribute in the PROFIBUS DP-V1 Object (FDh) in the host application is
optional.
The maximum amount of configuration data that can be handled by the module is 244 bytes.
See also...
•PROFIBUS DP-V1 Object (FDh), p. 36 (Attribute #3, Configuration Data)
•I/O Related Keywords, p. 47
•Definition of Modules, p. 48
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4.6.2 Validation
Using the Chk_Cfg service, the PROFIBUS master will send the Actual Configuration Data
needed for the application to the module. The module will compare the Actual Configuration Da-
ta with the Expected Configuration Data. In case of a mismatch, the module will send the Actual
Configuration Data to the host application for further evaluation.
Attribute Configuration Data not implemented
The module will calculate the Expected Configuration Data. The way this is done will depend on
whether the application has implemented the Modular Device Object or not. For more detailed
information...
•Definition of Modules, p. 48 (Modular Device Object Implemented)
•Parameterization Related Keywords, p. 53
In case of a mismatch between the Actual Configuration Data and the Expected Configuration
Data, the module will send a remap command to the application based on the Actual Configura-
tion Data.
If the application approves the new configuration, the module will accept it and go online.
If the application discards the remap command, the module will signal configuration fault on the
network.
For backward compatibility with the Anybus CompactCom 30 series, it is also possible for the
module to approve the configuration if the following criteria are met:
• Actual Configuration Data is not in special format
• The lengths of the Actual Configuration Data and the Expected Configuration Data are
equal
• Bit 0 (ChkCfg mode) in byte 2 of the DP-V1 status is set to 1
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Attribute Configuration Data implemented
Expected Configuration Data is provided by the application. The format of the configuration data
is not specified or known by the module. The module will however calculate the total input and
output lengths based on the parts of the configuration that it can interpret. If the provided config-
uration data length does not match the length of all mapped ADIs, the module will enter EXCEP-
TION state.
If the Actual Configuration Data matches the Expected Configuration Data, the module will ap-
prove the configuration.
If the Actual Configuration Data does not match the Expected Configuration Data, and if bit 0
(ChkCfg mode) in byte 2 of the DP-V1 status is set to 1, the host application must evaluate the
contents of the Configuration Data attribute.
• To accept the Configuration Data, respond with no error code.
If the new configuration affects the Process Data mapping, it is important that the
host application updates the Process Data before responding. Failure to observe
this may cause erroneous data to be sent to the bus on the next state shift.
Preferably, choose to reject the Actual Configuration Data and adapt to it by
restarting the Anybus module and then revise the Process Data map and/or the
Expected Configuration Data. Also note that the new configuration must exist in
the GSD file of the product.
Please note that if the application accepts the Configuration Data, but the length of the Ex-
pected Configuration Data is less than the length of the Actual Configuration Data, the con-
figuration will be rejected by the module.
• To reject the Configuration Data, respond with one of the following error codes:
– NOT_ENOUGH_DATA
– TOO_MUCH_DATA
– OUT_OF_RANGE
– INVALID_STATE
– NO_RESOURCES
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4.7 Set Slave Address
The module supports the Set Slave Address service, which enables a master or configuration
tool to set the node address from the network.
This service features a flag which specifies whether or not it is allowed to change the device ad-
dress from the network again at a later stage. If the service is accepted, the module saves the
value of this flag in nonvolatile memory; the only way to restore it again is by performing a Fac-
tory Default-reset on the Network Configuration Object (consult the general Anybus Compact-
Com 40 Software Design Guide for more information). This behavior is mandatory for the
application to pass PROFIBUS network certification.
The module will accept new settings received via this service under the following conditions:
• The Device Address attribute (Network Configuration Object (04h)) is set to a value higher
than 125.
The SSA Enabled attribute (PROFIBUS DP-V1 Object (FDh))) is set to TRUE (or not
implemented).
The module is not in Data Exchange.
The module is addressed with the correct Ident Number.
No previous Set Slave Address request prevents the module from accepting the new
settings.
See also...
•PROFIBUS DP-V1 Object (FDh), p. 36 (Attribute #4, SSA Enabled)
•Supported DP Features, p. 46
It is possible to disable support for this service by implementing the SSA Enabled attribute in the
PROFIBUS DP-V1 Object (FDh). In such a case, a new GSD file must be created, and fieldbus
re-certification is necessary.
4.8 Parameter Read/Write with Call
4.8.1 General information
Parameter Read/Write with Call enables addressing of ADIs based on instance numbers rather
than Slot and Index. This is useful if the ADI implementation is primarily designed for a linear
addressing scheme as used on most other networks. It may also prove useful when using mas-
ters with limited addressing capabilities for slot 0, since such masters may otherwise have trou-
ble accessing ADI instances 1... 255.
Unlike the standard DP-V1 Read/Write service, Parameter Read/Write with Call uses the Call
application service. On the PROFIBUS telegram level, the Parameter Read with Call service re-
quest consists of a standard DP-V1 header, a Call header, and the ADI number. When received
by the module, this is translated into a standard object request towards the application data
object.
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