Page 1
Issue : 4
24 June 2010
Profibus PA
Fieldbus Display [ Revision 2 ]
and Fieldbus Indicator
Fieldbus Interface Guide
Page 2
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: +44 (0)1462 438301
Email: support@beka.co.uk
Page 3
Contents
I
ntroduction ...................................................................................................................................................................... 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
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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
• A description 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
support@beka.co.uk 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.
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5 General 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.
A typical 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
Page 6
6 General 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 1 2 3 4 5 6 7 8 Variable
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
Page 7
7 General 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 2Module 3Module 4Module 5Module 6Module 7Module
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: 1 byte (8 bit unsigned)
VALUE: 4 byte (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
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
Page 8
8 General Information
Configuration Methods
Configuration may be performed via either DPV1 or DPV0 user prm data. However, some items must be configured
u
sing 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 DPV0 DPV1 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 Yes Yes Yes Yes Yes
Gain_Factor Yes Yes Yes Yes Yes
Descriptor Yes No Yes
Units Yes No Yes
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
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9 Fieldbus Display
Fieldbus Display : Product Overview
A detailed 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.
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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
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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
h
ardware 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
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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.
T
he 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.
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13 Fieldbus Indicator
Fieldbus Indicator : Product Overview
A detailed 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.
D
isplay
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.
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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.
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15 PA Reference
Appendix A
Profibus PA
Reference Information
Page 16
16 PA Reference
Block Identifiers
Block ID PA blocks
0 Physical block
1 AO_1 function block
2 AO_2 function block
3 AO_3 function block
4 AO_4 function block
5
AO_5 function block
6 AO_6 function block
7 AO_7 function block
8 AO_8 function block
9 DI_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
1 Boolean 1 True or false
2 Integer8 1
3 Integer16 2
4 Integer32 4
5 Unsigned8 1
6 Unsigned16 2
7 Unsigned32 4
8 FloatingPoint 4
9
VisibleString 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
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17 PA Reference
DS-BEKA-6 – 488 Display IN_DATA Structure (DPV1)
Parameter Data Type Size
1 BARGRAPH_MIN Float 4
2 BARGRAPH_MAX Float 4
3 DISPLAY_FORMAT Unsigned8 1
4 ZERO_OFFSET Float 4
5 GAIN_FACTOR Float 4
6 DESCRIPTOR VisibleString 16
7 UNITS VisibleString 8
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1 One decimal place
2 Two decimal places
3 Three decimal places
4 Four decimal places
5 Auto format
DS-BEKA-7 – 444 Indicator IN_DATA Structure (DPV1)
Parameter Data Type Size
1 BARGRAPH Unsigned8 1
2 BARGRAPH_MIN Float 4
3 BARGRAPH_MAX Float 4
4 DISPLAY_FORMAT Unsigned8 1
5 ZERO_OFFSET Float 4
6 GAIN_FACTOR Float 4
Enumeration for BARGRAPH: 0 Disabled
1 Left Align
2 Centre Align
3 Right Align
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1 One decimal place
2 Two decimal places
3 Three decimal places
4 Four decimal places
5 Auto format
DS-BEKA-8 – 488 Display IN_DATA Structure (DPV0)
Parameter Data Type Size
1 BARGRAPH_MULT Unsigned8 1
2 BARGRAPH_MIN Signed16 2
3 BARGRAPH_MAX Signed16 2
4 DISPLAY_FORMAT Unsigned8 1
5 ZERO_MULT Unsigned8 1
6 ZERO_OFFSET Signed16 2
7 GAIN_MULT Unsigned8 1
8 GAIN_FACTOR Signed16 2
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1 One decimal place
2 Two decimal places
3 Three decimal places
4 Four decimal places
5 Auto format
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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
1 0.0001
2 0.001
3 0.01
4 0.1
5 1.0
6 10.0
7 100.0
8 1000.0
9 10000.0
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 Data Type Size
1 BARGRAPH Unsigned8 1
2 BARGRAPH_MULT Unsigned8 1
3 BARGRAPH_MIN Signed16 2
4 BARGRAPH_MAX Signed16 2
5 DISPLAY_FORMAT Unsigned8 1
6 ZERO_MULT Unsigned8 1
7 ZERO_OFFSET Signed16 2
8 GAIN_MULT Unsigned8 1
9 GAIN_FACTOR Signed16 2
Enumeration for BARGRAPH: 0 Disabled
1 Left Align
2 Centre Align
3 Right Align
Enumeration for DISPLAY_FORMAT: 0 No decimal places
1 One decimal place
2 Two decimal places
3 Three decimal places
4 Four decimal places
5 Auto 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
1 0.0001
2 0.001
3 0.01
4 0.1
5 1.0
6 10.0
7 100.0
8 1000.0
9 10000.0
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.
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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
1
Reserved Unsigned8 (5)
1
2
Block Object Unsigned8 (5)
1
3
Parent Class Unsigned8 (5)
1
4
Class Unsigned8 (5)
1
5
DD Reference Unsigned32 (7)
4
6
DD Revision Unsigned16 (6)
2
7
Profile OctetString (10)
2
8
Profile Revision Unsigned16 (6)
2
9
Execution 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
1 Value Float (8) 4
2 Status 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
1 Value Unsigned8 (5) 1
2 Status 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
1 Actual OctetString (10) 1
2 Permitted OctetString (10) 1
3 Normal OctetString (10) 1
DS-42 – Alarm Summary Structure
This data structure consists of data that summarize 16 alarms.
Element Name Data Type (Index) Size
1 Current OctetString (10) 2
2 Unacknowledged OctetString (10) 2
Unreported OctetString (10) 2
3 Disabled 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.
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20 PA Reference
AO Transducer block – 488 Display
Index Parameter Type Size Store
Read /
Write
0 TB 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
1 ST_REV Unsigned16 2 N RO
2 TAG_DESC Octet String 32 S R/W
3 STRATEGY Unsigned16 2 S R/W
4 ALERT_KEY Unsigned8 1 S R/W
5 TARGET_MODE Unsigned8 1 S R/W
6 MODE_BLK DS-37 3 D R/W
7 ALARM_SUM DS-42 8 D RO
8 FINAL_VALUE_1 DS-33 5 D RO
9 FINAL_VALUE_2 DS-33 5 D RO
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-6 41 N R/W
17 IN_DATA_2 DS-BEKA-6 41 N R/W
18 IN_DATA_3 DS-BEKA-6 41 N R/W
19 IN_DATA_4 DS-BEKA-6 41 N R/W
20 IN_DATA_5 DS-BEKA-6 41 N R/W
21 IN_DATA_6 DS-BEKA-6 41 N R/W
22 IN_DATA_7 DS-BEKA-6 41 N R/W
23 IN_DATA_8 DS-BEKA-6 41 N R/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-8 12 N See above
IN_DATA_3 DS-BEKA-8 12 N See above
IN_DATA_4 DS-BEKA-8 12 N See above
IN_DATA_5 DS-BEKA-8 12 N See above
IN_DATA_6 DS-BEKA-8 12 N See above
IN_DATA_7 DS-BEKA-8 12 N See above
IN_DATA_8 DS-BEKA-8 12 N See above
LAST_VARIABLE Unsigned8 1 N
STATUS_TEXT Unsigned8 1 N
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.
Page 21
21 PA Reference
AO Transducer block – 444 Indicator
Index Parameter Type Size Store
Read /
Write
0 TB 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
1 ST_REV Unsigned16 2 N RO
2 TAG_DESC Octet String 32 S R/W
3 STRATEGY Unsigned16 2 S R/W
4 ALERT_KEY Unsigned8 1 S R/W
5 TARGET_MODE Unsigned8 1 S R/W
6 MODE_BLK DS-37 3 D R/W
7 ALARM_SUM DS-42 8 D RO
8 FINAL_VALUE_1 DS-33 5 D RO
9 FINAL_VALUE_2 DS-33 5 D RO
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-7 18 N R/W
17 IN_DATA_2 DS-BEKA-7 18 N R/W
18 IN_DATA_3 DS-BEKA-7 18 N R/W
19 IN_DATA_4 DS-BEKA-7 18 N R/W
20 IN_DATA_5 DS-BEKA-7 18 N R/W
21 IN_DATA_6 DS-BEKA-7 18 N R/W
22 IN_DATA_7 DS-BEKA-7 18 N R/W
23 IN_DATA_8 DS-BEKA-7 18 N R/W
24 INSTRUMENT_TEMPERATURE Float 4 D RO
25 LAST_VARIABLE Unsigned8 1 N R/W
Configuration of 444 Indicator 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-9 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-9 13 N
IN_DATA_2 DS-BEKA-9 13 N
IN_DATA_3 DS-BEKA-9 13 N
IN_DATA_4 DS-BEKA-9 13 N
IN_DATA_5 DS-BEKA-9 13 N
IN_DATA_6 DS-BEKA-9 13 N
IN_DATA_7 DS-BEKA-9 13 N
IN_DATA_8 DS-BEKA-9 12 N
LAST_VARIABLE Unsigned8 1 N
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.
Page 22
22 PA Reference
DI Transducer block – 488 Display and 444 Indicator
Index Parameter Type Size Store
Read /
Write
0 TB 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
1 ST_REV Unsigned16 2 N RO
2 TAG_DESC Octet String 32 S R/W
3 STRATEGY Unsigned16 2 S R/W
4 ALERT_KEY Unsigned8 1 S R/W
5 TARGET_MODE Unsigned8 1 S R/W
6 MODE_BLK DS-37 3 D R/W
7 ALARM_SUM DS-42 8 D RO
8 PRIMARY_VALUE_D1 DS-34 2 D RO
9 PRIMARY_VALUE_D2 DS-34 2 D RO
10 PRIMARY_VALUE_D3 DS-34 2 D RO
11 PRIMARY_VALUE_D4 DS-34 2 D RO
12 PRIMARY_VALUE_D5 DS-34 2 D RO
13 PRIMARY_VALUE_D6 DS-34 2 D RO
Page 23
23 Troubleshooting
Appendix B
Troubleshooting
Page 24
24 Troubleshooting
What version do I have?
Single Variable Versions:
The version number can be seen during the unit power-up cycle. At power up the unit will first turn all the LCD
segments on. It will then display the model number without options i.e. BA444 and following this it will display PNx.xx
or PLx.xx where x.xx is the firmware version. A PNx.xx version means that the unit is currently configured as a node,
a
nd a PLx.xx version means that the unit is currently configured as a listener.
Multiple Variable Versions:
There are two methods to identify the version of product that you have. The first is to watch the splash screen on power
up and note the SW number at the bottom of the screen. The second is to enter the configuration menu, scroll down to
User Info. This screen gives the model number and the software version.
How do I reset it to Factory Defaults?
The display can be reset using the main configuration menu. Please refer to the instruction manual for full details.
Why does the unit always display 0.0 BAD?
This occurs because the default failsafe is set to that setting, and the IN_n variable is not being sent a value with a good
status.
Page 25
25 Worked Example
Appendix C
Using a Profibus Listener
Worked Example
Page 26
26 Worked Example
Setting up the Profibus Listener
In order to be able to set up a BEKA Profibus listener it is necessary to have a basic understanding of how data on a
Profibus system is passed between the host and the devices. This document aims to provide that information at a very
simplified level.
A
s a general rule a Profibus PA segment will be connected to a Profibus DP network and controller, via a segment
coupler. The segment coupler adjusts the communication speed and signalling so that the PA devices are visible to the
controlling host and software.
Each device attached to the segment has a physical address between 1 and 125 with address 1 or 2 being reserved for
the controller. To make a process happen, the controller will read data from a number of instruments, it will process the
data and finally write the data out to other devices in order to keep the process running smoothly. It is the data that is
being “read from” and “written to” the devices on the segment that the listener can tap into.
In order to capture the data, we need to know how to locate it. When each device is loaded on to the segment it has a
number of “Slots” in which the plant engineer places a software module representing the data that the slot is capable of
dealing with. e.g. a SP Module consists of a 4 byte floating point number and a status byte. (known as a DS-33 data
type).
The following example shows a temperature transmitter with two slots, the first one represents the temperature read
from the external sensor, the second one represents the body temperature used for CJ compensation:
Page 27
27 Worked Example
The plant engineer has set the address to 9 and loaded a SP module into both slots on the device. The slot data for a
device is read in one go. Therefore a read of the device at address 9 with consist of 10 bytes containing a float with its
status followed by another float with its status. The first item of data will start at Address 9 index 0 while the second
value, status combination will start at Address 9 index 5. This address and index data is available to the plant engineer
on the programming workstation for the host. When data is transmitted by the host it takes the form of
Source_Address,Destination_Address and Data.
The BEKA listener uses this information to display the value that the user wants to view. The user simply sets up the
Source Address, Destination Address and the Index into the data packet. In the above example, setting a source address
of 9, a destination address of 1 (Host Controller) and an Index of 5 would point at the second DS-33 data block i.e. the
body temperature.
The following example gives the 7 steps to display a temperature value that is being read by a host at address 1 from a
temperature transmitter at address 9.
o Press P+E and the word SCAn will appear.
o Press P and the display will now show two numbers. The first is the Source Address, the second is the
Destination Address.
o Press the UP Arrow or Down Arrow until 09-01 appears. i.e the data is coming from Address 9 and being sent
to Address 1.
o Press P – The display will show the value of the data at index 0
o Press P – The display will now show IN_1 which is the display input to assign the data to.
o Press the UP Arrow or Down Arrow to change the display input to IN_2, IN_3 etc as required
o Press E – To save this configuration and move back up the menu.
o Press E – a further three times to return to the unit to operate mode.
The listener will now display live data on the screen and in this case it will show the process value.
To get the body temperature it will be necessary to edit the settings for IN-1 and change the Index to 5. The number of
decimal points, bargraph settings and display scaling can also be set up on the listener using the local configuration
menu entries.
There are many data formats available on a system. The DS-33 (Value,Status) data format is the most common one for
passing real process values about on a segment and currently this listener can only tune into that data format.
Page 28
BEKA Associates
Old Charlton Road
Hitchin
Hertfordshire
SG5 2DA
Tel: +44 (0)1462 438301
Fax: +44 (0)1462 453971
Web: www.beka.co.uk
Email: support@beka.co.uk
or sales@beka.co.uk
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