BEKA BA488CF User manual

Issue : 4
24 June 2010
Profibus PA
Fieldbus Display [Revision 2 ]
and Fieldbus Indicator
Fieldbus Interface Guide

This guide applies to the following models:
Multiple Variable Fieldbus Display
BA488CF - Panel mounted, Intrinsically Safe
BA484DF - Field mounted, Intrinsically Safe
BA688CF - Panel mounted, Safe Area
BA684DF - Field mounted, Safe Area
Eight Variable Fieldbus Indicator
BA444DF - Field mounted, Intrinsically Safe
BA444NDF - Field mounted, Type nL
BA448CF - Panel mounted, Intrinsically Safe
BA644DF - Field mounted, Safe Area
BA648CF - Panel mounted, Safe Area
Please note: There are significant differences between Revision 2
Fieldbus Displays (those with version 3 firmware) and prior versions.
Documentation for these earlier products is available from our website,
or by contacting our sales department.
Can’t make it work ?
Please refer to the Troubleshooting section in Appendix B for common
problems and their solutions, and Appendix C for a worked example of setting
up the Listener.
If you still need assistance, please contact us directly:
Tel: [phone]
Email: [email protected]

Contents
Introduction ...................................................................................................................................................................... 4
What’s in this Fieldbus Interface Guide......................................................................................................................... 4
What’s in the Instruction Manuals .................................................................................................................................4
Other sources of information ......................................................................................................................................... 4
Displays Vs Indicators...................................................................................................................................................... 4
General Operation ............................................................................................................................................................ 5
Profibus Introduction ..................................................................................................................................................... 5
Configuration Methods .................................................................................................................................................. 8
Fieldbus Display : Product Overview ............................................................................................................................. 9
Display........................................................................................................................................................................... 9
Analogue Input Display ................................................................................................................................................. 9
Switch Inputs ................................................................................................................................................................. 9
Switch Outputs............................................................................................................................................................... 9
Profibus Block Structure................................................................................................................................................ 9
Profibus Configuration................................................................................................................................................... 9
Fieldbus Display : Features............................................................................................................................................ 10
Standard Screens.......................................................................................................................................................... 10
Setting the Fieldbus Address........................................................................................................................................ 11
Configuring the values to be displayed........................................................................................................................ 11
Configuring Units display and Tag information .......................................................................................................... 11
Reading the keypress status ......................................................................................................................................... 12
Controlling the (optional) alarm outputs...................................................................................................................... 12
Configuring alarm setpoints......................................................................................................................................... 12
Reading the approximate ambient temparture ............................................................................................................. 12
Fieldbus Indicator : Product Overview ........................................................................................................................ 13
Display......................................................................................................................................................................... 13
Analogue Input Display ............................................................................................................................................... 13
Switch Inputs ............................................................................................................................................................... 13
Switch Outputs............................................................................................................................................................. 13
Profibus Block Structure.............................................................................................................................................. 13
Profibus Configuration................................................................................................................................................. 13
Fieldbus Indicator : Features......................................................................................................................................... 14
Setting the Fieldbus Address........................................................................................................................................ 14
Configuring the values to be displayed........................................................................................................................ 14
Reading the keypress status ......................................................................................................................................... 14
Reading the approximate ambient temparture ............................................................................................................. 14
Appendix A Profibus PA Reference Information .................................................................................................... 15
Block Identifiers........................................................................................................................................................... 16
Data Types and Structures ........................................................................................................................................... 16
Floating Point Format .................................................................................................................................................. 19
Visible String Format................................................................................................................................................... 19
AO Transducer block – 488 Display............................................................................................................................ 20
AO Transducer block – 444 Indicator.......................................................................................................................... 21
DI Transducer block – 488 Display and 444 Indicator ................................................................................................ 22
Appendix B Troubleshooting....................................................................................................................................... 23
What version do I have? .............................................................................................................................................. 24
How do I reset it to Factory Defaults? ......................................................................................................................... 24
Why does the unit always display 0.0 BAD?............................................................................................................... 24
Appendix C Using a Profibus Listener Worked Example ....................................................................................... 25
Setting up the Profibus Listener................................................................................................................................... 26

4
Introduction
This guide gives all the necessary information to use our Fieldbus Displays and Indicators on a Profibus PA installation.
Several other protocols are commonly used in industry which we may choose to support as market demand rises. This
guide and others will periodically be updated, so please come back to our website regularly for the latest information.
For hardware installation information, please refer to the separate instruction manuals available for each model.
What’s in this Fieldbus Interface Guide
•An overview of each instrument
•Adescription of the parameters that are applicable to each instrument.
•Instructions on how to use the instrument in its standard modes
What’s in the Instruction Manuals
•An overview of the instrument
•Intrinsic Safety Certification information
•System Design and Installation
•Configuration
•Maintenance
Other sources of information
Our website at www.beka.co.uk is kept up to date with the latest literature and information
After reading through this guide, if you still have a problem getting the results you need then email us at
[e-mail] and we will do our best to help you
Displays Vs Indicators
The displays and indicators are internally very similar, but present the data in totally different ways. The simpler
Indicators have a non-backlit 5 digit, 7 segment display and 31 segment bargraph and are designed to give a cost
effective indication to operators. The more comprehensive Displays have a configurable backlit dot-matrix LCD, and
have provision for external pushbuttons and alarm outputs.
The Indicator is able to operate in a “Listener” mode whereby it does not appear as a device on the network, but simply
listens for appropriate data on the segment it is connected to. All configuration must be performed locally, but thereafter
it imposes no overhead on the network. This mode is useful where timing is critical, in retrofit applications or when
node licensing costs need to be minimised.
Both products can display up to eight variables, selectable by pushbuttons on the front of the instrument. In addition, the
pushbuttons can be used for operator feedback.

5General Information
General Operation
The primary purpose of a BEKA fieldbus display is to enable local indication of up to 8 fieldbus process variables.
This is normally achieved using cyclic data writes to the AO Function blocks.
The configuration of the display can be manually carried out using the local configuration menus, or acyclic data
transfers can be sent to parameters in the custom transducer blocks using DPV1 or DPV0 user prm data.
Profibus Introduction
Profibus is a fieldbus protocol designed for communicating between host and field devices. There are several layers to
the Profibus standard: Profibus DP (Decentralised Periphery) is the high speed solution designed and optimised
especially for communication between automation systems and decentralised field devices. Profibus DP exchanges
input and output information in a cyclic manner. This cyclic data traffic is the basis of the system and is described as
Version 0 or DPV0.
Atypical automation system will read all the inputs and then use this data in conjunction with the process design
parameters to calculate the new output values. These values will then be written to the output devices. The whole cycle
will then start all over again. This sequence is described as Cyclic Data.
The time cycle required to control the process on the plant often leaves the host with some spare time that can be used
for background and other tasks. This, combined with the need of the instrument engineer to be able to configure and
maintain the field devices without going out on to the plant, led to the development in 1997 of a revised standard,
Profibus DPV1.
DPV1 provides the host with a mechanism to get data about the configuration and health of each field device. This only
happens when specifically requested, and only when the host controller has the time to be able to do it. This kind of data
transfer is known as Acyclic data.
It is important to note that Cyclic Data traffic has priority over the Acyclic Data traffic as it is used for the plant control.
The following diagram shows how the data flows from the host to the BEKA Fieldbus device:
Read
Inputs
Other
Tasks
Process
Values
Write
Outputs

6General Information
Slot 14 OUT_D
Slot 9 OUT_D
Slot 1 Module n
Slot 8 Module n
Slot 14 – DI Function Block
Slot 9 – DI Function Block
Slot 1 – AO Function Block
Slot 8 – AO Function Block
Slot 0 – Physical Block
Slot 15 – AO Transducer Block
BEKA Fieldbus DisplayHOST Controller
Display
Application
Software
Host Application capable of dealing
with Profibus DPV1 extensions
e.g. Softing Configurator, Siemens
PDM or via an OPC Server
Data transfer is acyclic when the host
has time available.
14 Slots in
Profibus Host
System
Data transfer is
cyclic and routine
Slot x Module n Slot x – AO Function Block
Module 12345678Variable
Bytes Used 0 5 12 8 15 10 13 25
**** *Set point
* * * ReadBack
* * * Pos D
* * * * Checkback
***Rcas_In
***Rcas_Out
PROFIBUS DPV1 Area
PROFIBUS
DPV0 Area
Slot 16 – DI Transducer Block

7General Information
The BEKA Fieldbus Display is shown on the right side of the diagram. It consists of 17 virtual blocks named Slot 0 to
Slot 16. Data is transferred between the host and these slots by either routine cyclic data, or occasional acyclic data.
The resource block at Slot 0 gives the host a point of reference to find out about the facilities of the unit. This is only
done occasionally, so an acyclic data transfer is used for this purpose. The 8 AO function blocks at slots 1 – 8 are where
the host places the data to be displayed. The 6 DI function blocks at slots 9 – 14 are where the display places the keypad
information. As these are constantly being updated, routine cyclic data transfers are used. The remaining two transducer
blocks at slot 15-16 are used to configure the display, again by using (occasional) acyclic data.
The 8 AO function blocks are standard Profibus blocks, the specifications of which are available from the Profibus
organisation (As such the fine detail is not repeated in this manual). Each function block has 6 variables that can be
made accessible to the host system. These are shown in the first column of this table:-
Variable Module
1
Module
2
Module
3
Module
4
Module
5
Module
6
Module
7
Module
8
Set Point     
Readback   
POS D   
Checkback    
RCas_In   
RCas_Out   
Number of bytes
used in memory map 0 5 12 8 15 10 13 25
There are defined combinations of these 6 variables available as modules which are defined in the GSD description of
the BEKA device. These modules are used to selectively show or hide the variables that are relevant to the host
application. The choice of which module to use will depend on the design of the process and is left to the user to decide,
but for simple display applications the Set Point Module, Module 2 will be adequate.
When the Fieldbus Display is first loaded on the host system, the user will find 8 slots that can be configured with the 8
different types of module. If the user configures each slot with Module 2 then the host will only be able to access the
Setpoint on each function block. Each slot on the host will then take up 5 bytes of space thus defining the memory map
that the host is able to access. Writing to the Setpoint value will cause that value to be display on the field device.
From the memory map perspective, write a 32 bit float to the first four bytes of the slot, and write a GOOD status value
(128) to the status byte. The number will then appear on the screen.
Host Display
STATUS: 1byte (8 bit unsigned)
VALUE: 4byte (32bit) float
Address
However if the user needs the more complex functions of the AO Function block, other modules can be chosen, the
choice of which will affect the memory map of the instrument seen by the host
status
Slot 8
35
status
Slot 7
30
status
Slot 6
25
status
Slot 5
20
status
Slot 4
15
status
Slot 3
10
status
Slot 2
5
status
Slot 1 value
0
IN_8
IN_7
IN_6
IN_5
IN_4
IN_3
IN_2
IN_1
Single Variable Screen
Use the up and down arrow
keys to select the input
(IN_1 to IN_8) that is
displayed

8General Information
Configuration Methods
Configuration may be performed via either DPV1 or DPV0 user prm data. However, some items must be configured
using the local menus as described in the Instruction Manual. The following table summarises what method can be used
to configure each parameter.
Item Display Indicator
Menu DPV0DPV1 DPV0 DPV1
INDATA (1 to 8)
Bargraph Yes Yes
Bargraph Minimum Yes Yes Yes Yes Yes
Bargraph Maximum Yes Yes Yes Yes Yes
Display Format Yes Yes Yes Yes Yes
Zero_Offset YesYesYesYes Yes
Gain_Factor YesYesYesYes Yes
Descriptor YesNoYes
Units YesNoYes
Status Text Yes Yes Yes
Instrument Temperature No No Read Only No Read Only
Last Variable Yes Yes Yes Yes Yes
Optional Local Alarms Yes No No

9Fieldbus Display
Fieldbus Display : Product Overview
Adetailed overview of the instrument is given in the instruction manual for each product. This should be read before
implementing any system using these instruments. However it is useful to summarise the main features of the product
before attempting to design any controlling software application.
Display
The instrument display is organised as 120 pixels horizontally by 64 pixels vertically. Each pixel is 0.7mm square, the
size of which improves the contrast and hence the readability at greater distances.
The display is also backlit by an ultra-efficient green LED module which enables the screen to be viewed in all
conditions, from bright sunlight to total darkness.
Analogue Input Display
The primary purpose of this instrument is to display process variables that exist in a system. Eleven pre-programmed
screen layouts are available to display one, two, three, four or eight variables simultaneously. A total of eight (8)
variables can be accessed by using the front panel push buttons.
Switch Inputs
There are six push buttons on the front of the panel mounted instrument, and four on the field mounted instrument. Both
models have the option of overriding these with up to six external switches which can be sized and labelled to suit the
application.
Switch Outputs
As an optional accessory (available only at the time of ordering), there can be six switch outputs available. These are
totally isolated and can be energised or de-energised independently of each other. They can be driven by alarm set-point
values that can be assigned so that they operate automatically. Note that they are not intended to be used as
conventional Profibus Alarms and should be used for indication only. They are under the control of the local application
and are actioned on received values against stored setpoints. There is no communication of status across the fieldbus.
Profibus Block Structure
There are eight Analogue Output function blocks, one for each input value. In addition there are six Digital Input
function blocks, one assigned to each key. All data is transmitted using cyclic data.
Profibus Configuration
Configuration may be performed via either DPV1 or DPV0 user prm data. However, some items must be configured
using the local menus as described in the Instruction Manual. These are summarised in the table on page 8.

10 Fieldbus Display
Fieldbus Display : Features
The following sections describes how to use the features of the display. The relevant instruction manual for the
instrument being used must be read in conjunction with these notes, as the operation and description of the menu
structure is not detailed here.
Standard Screens
There are eleven standard screens available. They are capable of displaying a selection of up to eight process variables,
together with their units of measure and tag description. Once a screen format has been chosen, each input variable can
be brought into view by pressing the up and down arrow keys.
The screen format is selected by using the local configuration menu as described in the Instruction Manual. One of
eleven standard display formats can be selected as shown in the following table:
One
Variable
Two
Variables
Four
Variables
One
+
H-Bar
Two
+
H-Bars
One
+
V-Bar
Two
+
V-Bars
Three
+
V-Bars
Four
+
V-Bars
Eight
Variables
Eight
+
Bars

11 Fieldbus Display
Setting the Fieldbus Address
Each unit is supplied from the factory at the special address 126. This address MUST be changed to one between 1 and
125 before the display can be put into service.
The address should be set by using the local configuration menu as this is the simplest procedure. There are no
hardware links or DIP switches that need to be altered.
However, it is possible to set the address via the host software’s configuration package. The exact method varies
between packages, but as an example the Siemen’s SIMATIC PDM package adopts the following approach:
1. Open the PDM with a double-click on a PA device which supports assigning addresses via network, but do not
open the newly inserted device.
2. Assign the new address with "Device > Assign address" (e.g. from old:126 to new:51).
Note:
The function "Assign address" can change the addresses of all available PA devices. This function works
independently from currently open PA devices.
Configuring the values to be displayed
The unit can be configured to display up to eight values. The screen format is selected via the local configuration menu
which is detailed in the Instruction Manual.
The AO Function Blocks AO_1 to AO_8 should be assigned to the variables that need to be displayed. The data
structure used is DS-33 Floating Point Value + Status.
If the data has a status of BAD, or a status of GOOD but with a quality sub-status of “INITIATE FAULT STATE” or
“FAULT STATE ACTIVE” then the appearance of the value will be in inverse video i.e. clear pixels on a dark
background.
If local alarm setpoints have been defined, then the displayed value will flash when that point has been reached. The
appropriate output will also be activated .
Configuring Units display and Tag information
The “Tag” and “Units” displayed on each of the standard screens can be entered remotely by writing to the
IN_DATA_1 to IN_DATA_8 parameters in the AO Transducer Block. The DS-BEKA-6 data structure has a 16 byte
Visible String DESCRIPTOR parameter which corresponds to the Tag value, and a 8 byte Visible String UNITS
parameter. Each input can therefore be given its own unique data.
Information written in this way is saved to non-volatile memory and is retained if the power is cycled.
To simplify temperature display, the ‘character (alt+096) is mapped to the degrees symbol.
For example, the string Temp ‘C is displayed as Temp °C

12 Fieldbus Display
Reading the keypress status
Each of the six keys is connected to a DI function block, making it simple to use them for operator confirmation. Each
DI mirrors the status of the key and is not latched in any way. A momentary keypress over 50mS will be ‘stretched’ to
provide a change in status for at least 400ms. Shorter keypresses are discarded.
The unit has the facility to connect external switches in addition to the front panel buttons. By selecting the appropriate
“Keys” configuration in the local menu these external switches can be simple normally open or closed contacts that can
be used for a variety of basic signalling tasks.
Controlling the (optional) alarm outputs
The outputs can only be controlled by configuring alarm set-points. It is not possible to control the outputs directly via
the fieldbus, nor is it possible to read the status.
Configuring alarm setpoints
The alarm setpoints are primarily intended for local indication uses, and the only method of setting these up is to use the
local configuration menu, as described in the Instruction Manual.
Reading the approximate ambient temparture
The Analogue Out Transducer Block has an INSTRUMENT_TEMPERATURE parameter which shows the
approximate temperature (+/- 5°C) of the display in degrees Celcius as a read-only 4-byte float.

13 Fieldbus Indicator
Fieldbus Indicator : Product Overview
Adetailed overview of the instrument is given in the instruction manual for each product. This should be read before
implementing any system using these instruments. However it is useful to summarise the main features of the product
before attempting to design any controlling software application.
Display
The instrument display is organised as 5 digits, plus sign and a bargraph. There is an additional numeric indicator
showing the selected variable. There are no backlighting options available for these indicators; a Fieldbus Display must
be used if this feature required.
Analogue Input Display
The primary purpose of this instrument is to display process variables that exist in a system. A total of eight (8)
variables can be accessed by using the front panel push buttons.
Switch Inputs
There are six push buttons on the front of the panel mounted instrument, and four on the field mounted instrument.
Neither models have the option of external switches; a Fieldbus Display must be used if this feature required.
Switch Outputs
There are no alarm outputs on these models. A Fieldbus Display must be used if this feature required.
Profibus Block Structure
There are eight Analogue Output function blocks, one for each input value. In addition there are six Digital Input
function blocks, one assigned to each key. All data is transmitted using cyclic data.
Profibus Configuration
Configuration may be performed via either DPV1 or DPV0 user prm data. However, some items must be configured
using the local menus as described in the Instruction Manual. These are summarised in the table on page 8.

14 Fieldbus Indicator
Fieldbus Indicator : Features
The following sections describes how to use the features of the display. The relevant instruction manual for the
instrument being used must be read in conjunction with these notes, as the operation and description of the menu
structure is not detailed here.
Setting the Fieldbus Address
Each unit is supplied from the factory at the special address 126. This address MUST be changed to one between 1 and
125 before the display can be put into service.
The address should be set by using the local configuration menu as this is the simplest procedure. There are no
hardware links or DIP switches that need to be altered.
However, it is possible to set the address via the host software’s configuration package. The exact method varies
between packages, but as an example the Siemen’s SIMATIC PDM package adopts the following approach:
3. Open the PDM with a double-click on a PA device which supports assigning addresses via network, but do not
open the newly inserted device.
4. Assign the new address with "Device > Assign address" (e.g. from old:126 to new:51).
Note:
The function "Assign address" can change the addresses of all available PA devices. This function works
independently from currently open PA devices.
Configuring the values to be displayed
The unit can be configured to display up to eight values. The screen format is selected via the local configuration menu
which is detailed in the Instruction Manual.
The AO Function Blocks AO_1 to AO_8 should be assigned to the variables that need to be displayed. The data
structure used is DS-33 Floating Point Value + Status.
If the data has a status of BAD, or a status of GOOD but with a quality sub-status of “INITIATE FAULT STATE” or
“FAULT STATE ACTIVE” then the value will be alternated with a the word “BAD”.
Reading the keypress status
Each of the six keys is connected to a DI function block, making it simple to use them for operator confirmation. Each
DI mirrors the status of the key and is not latched in any way. A momentary keypress over 50mS will be ‘stretched’ to
provide a change in status for at least 400ms. Shorter keypresses are discarded.
Reading the approximate ambient temparture
The Analogue Out Transducer Block has an INSTRUMENT_TEMPERATURE parameter which shows the
approximate temperature (+/- 1°C) of the display in degrees Celcius as a read-only 4-byte float.

15 PA Reference
Appendix A
Profibus PA
Reference Information

16 PA Reference
Block Identifiers
Block ID PA blocks
0Physical block
1AO_1 function block
2AO_2 function block
3AO_3 function block
4AO_4 function block
5AO_5 function block
6AO_6 function block
7AO_7 function block
8AO_8 function block
9DI_1 function block
10 DI_2 function block
11 DI_3 function block
12 DI_4 function block
13 DI_5 function block
14 DI_6 function block
15 DI custom transducer block
16 AO custom transducer block
Data Types and Structures
Data Types
The data types (1-Boolean to 10-OctetString) are used as defined in the underlying PROFIBUS specification
IEC61158-5-10.
Data Type Size Comments
1Boolean 1Trueorfalse
2Integer8 1
3Integer16 2
4Integer32 4
5Unsigned8 1
6Unsigned16 2
7Unsigned32 4
8FloatingPoint 4
9VisibleString 1,2,3.. they are one byte per character, and
include the 7 bit ASCII character set.
10 OctetString 1,2,3.. Octet strings are binary
All structures use Profibus standard definitions apart from the four special structures given below:
Data Structure Identifier
DS-BEKA-6
DS-BEKA-7
DS-BEKA-8
DS-BEKA-9
The execution time for
all blocks is 100ms

17 PA Reference
DS-BEKA-6 – 488 Display IN_DATA Structure (DPV1)
Parameter DataTypeSize
1BARGRAPH_MIN Float 4
2BARGRAPH_MAX Float 4
3DISPLAY_FORMAT Unsigned8 1
4ZERO_OFFSET Float 4
5GAIN_FACTOR Float 4
6DESCRIPTOR VisibleString16
7UNITS VisibleString8
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1One decimal place
2Two decimal places
3Three decimal places
4Four decimal places
5Auto format
DS-BEKA-7 – 444 Indicator IN_DATA Structure (DPV1)
Parameter DataTypeSize
1BARGRAPH Unsigned81
2BARGRAPH_MIN Float 4
3BARGRAPH_MAX Float 4
4DISPLAY_FORMAT Unsigned8 1
5ZERO_OFFSET Float 4
6GAIN_FACTOR Float 4
Enumeration for BARGRAPH: 0 Disabled
1Left Align
2Centre Align
3Right Align
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1One decimal place
2Two decimal places
3Three decimal places
4Four decimal places
5Auto format
DS-BEKA-8 – 488 Display IN_DATA Structure (DPV0)
Parameter DataTypeSize
1BARGRAPH_MULT Unsigned8 1
2BARGRAPH_MIN Signed16 2
3BARGRAPH_MAX Signed16 2
4DISPLAY_FORMAT Unsigned8 1
5ZERO_MULT Unsigned81
6ZERO_OFFSET Signed162
7GAIN_MULT Unsigned81
8GAIN_FACTOR Signed162
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1One decimal place
2Two decimal places
3Three decimal places
4Four decimal places
5Auto format

18 PA Reference
BARGRAPH_MULT, ZERO_MULT and GAIN_MULT are multiplying factors applied to the
corresponding Signed16 parameters to create a float.
Enumeration for Multiplying Factors: 0 0.00001
10.0001
20.001
30.01
40.1
51.0
610.0
7100.0
81000.0
910000.0
10 100000.0
The default value for all multipliers is 5 which equates to a multiplication factor of 1.0.
Size of user-prm-data = 1 + 8 * (12 + 2) +1 + 1 = 115 bytes.
DS-BEKA-9 – 444 Indicator IN_DATA Structure (DPV0)
Parameter DataTypeSize
1BARGRAPH Unsigned81
2BARGRAPH_MULT Unsigned8 1
3BARGRAPH_MIN Signed16 2
4BARGRAPH_MAX Signed16 2
5DISPLAY_FORMAT Unsigned8 1
6ZERO_MULT Unsigned81
7ZERO_OFFSET Signed162
8GAIN_MULT Unsigned81
9GAIN_FACTOR Signed162
Enumeration for BARGRAPH: 0 Disabled
1Left Align
2Centre Align
3Right Align
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1One decimal place
2Two decimal places
3Three decimal places
4Four decimal places
5Auto format
BARGRAPH_MULT, ZERO_MULT and GAIN_MULT are multiplying factors applied to the
corresponding Signed16 parameters to create a float.
Enumeration for Multiplying Factors: 0 0.00001
10.0001
20.001
30.01
40.1
51.0
610.0
7100.0
81000.0
910000.0
10 100000.0
The default value for all multipliers is 5 which equates to a multiplication factor of 1.0.
Size of user-prm-data = 1 + 8 * (13 + 2) +1 = 122 bytes.

19 PA Reference
The standard Profibus data structures used in BEKA products are given below:
DS-32 – Block Structure
Element Name Data Type (Index) Size
1Reserved Unsigned8 (5) 1
2Block Object Unsigned8 (5) 1
3Parent Class Unsigned8 (5) 1
4Class Unsigned8(5)1
5DD Reference Unsigned32 (7) 4
6DD Revision Unsigned16 (6) 2
7Profile OctetString(10)2
8Profile Revision Unsigned16 (6) 2
9Execution Time Unsigned8 (5) 1
10 Number of Parameters Unsigned16 (6) 2
11 Address of VIEW_1 Unsigned16 (6) 2
12 Number of Views Unsigned8 (5) 1
DS-33 – Value & Status – Floating Point Structure (data type 101)
This data structure consists of the values and the state of the Floating Point parameters. These parameters can be inputs
or outputs.
Element Name Data Type (Index) Size
1Value Float(8)4
2Status Unsigned8(5)1
DS-34 – Value & Status – Integer Structure (data type 102)
This data structure consists of the values and the state of the integer parameters. These parameters are inputs.
Element Name Data Type (Index) Size
1Value Unsigned8(5)1
2Status Unsigned8(5)1
DS-37 – Mode Structure
This data structure consists of bit strings for actual, permitted, and normal modes.
Element Name Data Type (Index) Size
1Actual OctetString(10)1
2Permitted OctetString(10)1
3Normal OctetString(10)1
DS-42 – Alarm Summary Structure
This data structure consists of data that summarize 16 alarms.
Element Name Data Type (Index) Size
1Current OctetString(10)2
2Unacknowledged OctetString(10)2
Unreported OctetString(10)2
3Disabled OctetString(10)2
Floating Point Format
Many values are given as 4 byte floating point numbers. This is defined in IEEE 754 as the Single-Precision format.
Visible String Format
It is very important that no non-printing characters are used in variables defined with the VisibleString format.
Specifically, only ASCII values between 0x20 and 0x7E may be used.

20 PA Reference
AO Transducer block – 488 Display
Index Parameter Type Size Store Read /
Write
0TB Block Characteristics
RESERVED
BLOCK_OBJECT
CLASS
DD_REFERENCE
DD_REVISION
PROFILE
PROFILE_REVISION
EXECUTION_TIME
NUMBER_OF_PARAMETERS
ADDRESS_OF_VIEW_1
NUMBER_OF_VIEWS
DS-32 RO
1ST_REV Unsigned162NRO
2TAG_DESC OctetString32SR/W
3STRATEGY Unsigned162SR/W
4ALERT_KEY Unsigned81SR/W
5TARGET_MODE Unsigned81SR/W
6MODE_BLK DS-373DR/W
7ALARM_SUM DS-428DRO
8FINAL_VALUE_1 DS-335DRO
9FINAL_VALUE_2 DS-335DRO
10 FINAL_VALUE_3 DS-33 5 D RO
11 FINAL_VALUE_4 DS-33 5 D RO
12 FINAL_VALUE_5 DS-33 5 D RO
13 FINAL_VALUE_6 DS-33 5 D RO
14 FINAL_VALUE_7 DS-33 5 D RO
15 FINAL_VALUE_8 DS-33 5 D RO
16 IN_DATA_1 DS-BEKA-641N R/W
17 IN_DATA_2 DS-BEKA-641NR/W
18 IN_DATA_3 DS-BEKA-641NR/W
19 IN_DATA_4 DS-BEKA-641NR/W
20 IN_DATA_5 DS-BEKA-641NR/W
21 IN_DATA_6 DS-BEKA-641NR/W
22 IN_DATA_7 DS-BEKA-641NR/W
23 IN_DATA_8 DS-BEKA-641NR/W
24 INSTRUMENT_TEMPERATURE Float 4 D RO
25 LAST_VARIABLE Unsigned8 1 N R/W
26 STATUS_TEXT Unsigned8 1 N R/W
Configuration of 488 Display AO transducer parameters with DPV0
It is possible to configure all custom parameters of the AO transducer block via DPV0 services. The configuration of
the device via DPV0 must not exceed the limit of 234 bytes for user-prm-data. For this reason DS-BEKA-8 has to be
used as this data structure does not contain strings.
The DPV0 configurable AO transducer parameters are:
AO TB parameter
user-prm-data Data Type Size Store Description
USE_DPV0_CONFIG Boolean 1 N 1 = True, 0 = False
IN_DATA_1 DS-BEKA-8 12 N The DESCRIPTOR and UNITS values are not initialised during DPV0 configuration.
IN_DATA_2 DS-BEKA-812NSeeabove
IN_DATA_3 DS-BEKA-812NSeeabove
IN_DATA_4 DS-BEKA-812NSeeabove
IN_DATA_5 DS-BEKA-812NSeeabove
IN_DATA_6 DS-BEKA-812NSeeabove
IN_DATA_7 DS-BEKA-812NSeeabove
IN_DATA_8 DS-BEKA-812NSeeabove
LAST_VARIABLE Unsigned81 N
STATUS_TEXT Unsigned81N
Usage of parameter USE_DPV0_CONFIG:
True : The device is configured via DPV0. DPV1 configuration is not possible. Acyclic writes to configuration
parameters result in an error when the value to write is different to the stored value.
False : The device is configured via DPV1. DPV0 user-prm-data is ignored during startup of the device.