Festo CMSH User manual

CMSH
Positioner
Manual | DTM
8175982
2022-08
[8175984]

Translation of the original instructions
DTM®, FDT®, FDT Group®, HART®, PACTware® are registered trademarks of the respective trademark
owners in certain countries.

Festo — CMSH — 2022-08
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Table of contents
1 CMSH DTM and FDT frame application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 DTM and FDT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Getting to know CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.1 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.2 System requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.3 Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Functions of the FDT frame application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Setting up CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Installing CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Updating CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Open functions of the FDT frame application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Open Online mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Offline mode of the CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Online mode of the CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 ‘Dashboard’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 ‘Identifikation’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 ‘Device’ area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2 ‘HART’ area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.3 ‘Operation unit’. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 ‘Guided setup’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.1 ‘Tight close’ area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.2 ‘Automatic initialization’ area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4 ‘Settings’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4.1 ‘Basic parameterization’ tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4.2 ‘User defined setpoint curve’ tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.3 ‘Control’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.4.4 ‘Digital inputs’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.5 ‘Digital outputs’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.6 ‘Device’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.5 ‘Initialization’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.6 ‘Diagnosis’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.6.1 ‘Monitoring’ window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.6.2 ‘Activation’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.6.3 ‘Actuator’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4.6.4 ‘Armature’ area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.6.5 ‘Control deviation’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.6.6 ‘Histograms’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.6.7 ‘Partial Stroke Test’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.6.8 ‘Positioner’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.6.9 ‘Pressure monitoring’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4.6.10 ‘Temperature monitoring’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4.6.11 ‘Other diagnosis functions’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

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4.7 ‘Service’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.7.1 ‘Current device configuration’ window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.7.2 ‘Festo support’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
4.8 ‘Diagnosis’ menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5 Messages in the CMSH DTM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.1 Message groups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.2 Device status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.3 Message descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

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CMSH DTM and FDT frame application
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1 CMSH DTM and FDT frame application
1.1 DTM and FDT
A Device Type Manager (DTM) is used for parameterisation of field devices. The DTM runs in frame
applications that have been implemented according to the Field Device Tool (FDT) standard.
FDT and DTM are cross-manufacturer concepts. Application of these concepts enables access to
different field devices from different manufacturers with one program.
A HART gateway or a HART master is required for hardware communication with a HART field device.
Software-side communication is via a Communication Device Type Manager (CommDTM). A CommDTM
provides a communication path to a HART field device for a specific fieldbus protocol. FDT frame appli-
cations have their own CommDTM or equivalent interfaces. Both the device DTM and the CommDTM
must be implemented according to the FDT standard so the DTM can be used in FDT frame applica-
tions.
1.2 Getting to know CMSH DTM
1.2.1 Functions
A DTM is available for the positioner CMSH with HART communication. The functions may be displayed
differently in different FDT frame applications.
The DTM includes the following functions:
–Offline and online configuration of the device
–Upload and download device configuration
–Save device configuration
–Import and export device configuration
–Monitor device health
–Execute device-specific functions
1.2.2 System requirements
–The device DTM, the corresponding hardware with the associated driver and a CommDTM must be
installed.
–The DTM supports the FDT 1.2.x specification and conforms to the FDT style guide.
–The DTM supports the HART 7 protocol.
1.2.3 Interface
The DTM user interface is available in German and English. The height and width of the user interface
can be adjusted. Content that is not displayed in the navigation area and application area can be
displayed using the scroll bar.
Additional information can be found in the FDT style guide for the FDT Group.

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CMSH DTM and FDT frame application
1
2
3
4
5
Fig. 1: Interface
1
Navigation area
2
Identification area
3
Application area
4
Action area
5
Status area
Application and action area
All device parameters are displayed in the application area. Some device parameters can be changed.
If a device parameter has been changed, a symbol è Tab. 1 Icons in the application area after
changing a parameter appears next to the selection field or the input field. All changed device
parameters are only accepted after pressing the ‘Apply’ button in the action area.
Symbol Meaning
The parameter value can be changed.
The admissibility of the entry is constantly checked.
If a parameter value is not allowed, this symbol appears.
If a parameter value is uncertain, this symbol appears.
Tab. 1: Icons in the application area after changing a parameter

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CMSH DTM and FDT frame application
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Button Function
All changes to the DTM environment are applied.
The entire DTM environment is restored. The last saved parameter
values are displayed and the pencil icon disappears from the applica-
tion area.
The entire DTM is closed.
Tab. 2: Buttons in the action area
Status area
Status information about the DTM and the device is shown in the status area. The following informa-
tion is displayed:
–The connection status of the DTM
–The feedback of an active communication between DTM and device
–The source and state of the displayed data
–The device status according to NAMUR recommendation NE 107 of the currently displayed applica-
tion parameters
–The active user role
1.3 Functions of the FDT frame application
The FDT frame application PACTware 4.1 is used for the display. The display can vary depending on the
FDT frame application.
Function Description
Connect An attempt is made to establish a connection between DTM and the
device via the communication path defined in the project.
In the project view of the FDT frame application, all participating DTM
and the CommDTM are highlighted. If the connection could be estab-
lished successfully, the corresponding icon is displayed.
If communication with the device could not be completed successfully,
an error message appears.
Disconnect The connection is automatically disconnected when the FDT frame
application is closed.
When a CommDTM is disconnected, all DTMs connected above it are
disconnected at the same time.
Load from device If there is a connection between DTM and device, the DTM starts to
read data from the device.
Which data is read from the device is specified in the DTM. The applica-
tion area can display the data successfully read from the device.

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Setting up CMSH DTM
Function Description
Store to device If the connection has been successfully established, the DTM begins to
write data to the device.
The data written to the device is defined in the DTM.
Parameter The functions and parameters accessible via the DTM are called via this
function.
Add device This function can be used to add another device to the project view of
the FDT frame application. A catalogue of all DTM that can be used for
a CommDTM is offered.
Exchange device This function allows a device to be replaced with another equivalent
device.
Delete device This function removes the selected device from the project. In the case
of a CommDTM, all devices connected to it are also removed.
Properties <CMSH> CMSH This function is used to call up information about the selected DTM and
the field device.
Tab. 3: Functions of the FDT frame application
2Setting up CMSH DTM
2.1 Installing CMSH DTM
Requirement: a FDT frame application must be installed.
1. Download the latest DTM installation package from the support portal è www.festo.com/sp.
2. Close all running programs.
3. Run the installer and follow the installation instructions.
4. If the DTM installation package has been installed successfully, start the FDT frame application.
ÄThe FDT frame application recognizes the DTM.
5. Update the FDT frame application project view.
ÄThe newly installed DTM is visible in the project view of the FDT frame application.
2.2 Updating CMSH DTM
•Reinstall the DTM to update it è 2.1 Installing CMSH DTM.
ÄThe previously installed DTM version is available in the project view of the FDT frame
application. The old DTM version will be overwritten.
2.3 Open functions of the FDT frame application
The process is described based on the FDT frame application PACTware 4.1. The process may vary
depending on the FDT frame application.
•Right-click on the desired DTM in the project view of the FDT frame application.
ÄThe functions of the FDT frame application are listed in the context menu è 1.3 Functions of
the FDT frame application.

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Online mode of the CMSH DTM
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Alternative: select the ‘Device data’ menu in the menu bar. The menu items show the functions of the
FDT frame application.
2.4 Open Online mode
The process is described based on the FDT frame application PACTware 4.1. The process may vary
depending on the FDT frame application.
1. Double-click on the required DTM in the project view of the FDT frame application.
ÄThe DTM is opened in the FDT frame application.
2. Click on the DTM in the project view of the FDT frame application.
3. Click on the ‘Connect’ item in the context menu.
4. When the connection to the device has been established, click on the ‘Parameter’ item in the
context menu.
ÄA status message appears.
ÄThe menus of the online mode are visible in the navigation area.
3 Offline mode of the CMSH DTM
In Offline mode, all device parameters that can be edited when the FDT frame application is not
connected to a device are displayed. In addition, all device parameters that cannot be changed are
displayed.
The menus in Offline mode correspond structurally to the ‘Device’ menu in the Online mode with minor
differences in content.
The following menus of the device parameters are available in the navigation area:
–Identifikation
–Guided setup
–Settings
–Diagnosis
–Service
4 Online mode of the CMSH DTM
In Online mode, all device functions and device parameters of the connected device are displayed.
The following menus are available in the navigation area:
–Dashboard
–Device
–Diagnosis
The structure of the ‘Device’ menu corresponds to the entire menu in Offline mode with minor
differences in content.
4.1 ‘Dashboard’ menu
The ‘Dashboard’ menu shows an overview of all process variables and status information. This infor-
mation is updated cyclically.

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Online mode of the CMSH DTM
The following information is displayed in the ‘Dashboard’ menu:
–States and information about the status of the device
–Process variables for operation
–Operating conditions
2 3 4 6
5
7
8
91011
1
Fig. 2: ‘Dashboard’ menu
1
Analogue input display
2
Display for operation
3
Device status display in accordance with
NAMUR recommendation NE 107
4
Display of the initialisation status
5
Digital values of the analogue input, the
setpoint position and the actual position
7
Display of setpoint position and actual
position
8
Position diagram of setpoint position and
actual position
9
Temperature display
10
Display of the chamber pressures
11
Supply pressure display

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Online mode of the CMSH DTM
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6
Indication of the tight closure status
Device status display in accordance with NAMUR recommendation NE 107
If there are no active messages, the ‘Good’ device status is displayed. If there are several messages,
the status of the message with the highest priority is displayed here.
A list of active alerts is opened when the device status display is clicked.
The messages are assigned to one of the following 4 status messages according to
NAMUR recommendation NE 107.
Symbol Information/state
Good
Maintenance required
Out of specification
Check function
Failure
Tab. 4: Device status display in accordance with NAMUR recommendation NE 107
Display for operation
Symbol Information/state
Automatic mode
Manual operation
Active control signal at the digital input
Tab. 5: Display for operation
Display of the initialisation status
Symbol Information/state
Valid initialisation
No valid initialisation
Tab. 6: Display of the initialisation status

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Online mode of the CMSH DTM
Indication of the tight closure status
Symbol Information/state
–Tight closing effective
–The current target position specification is in the tight-closing range
Tight closing not effective
Tab. 7: Indication of the tight closure status
4.2 ‘Identifikation’ menu
Basic information about the device, HART communication and the operating unit is displayed in the
‘Identifikation’ menu.
4.2.1 ‘Device’ area
Device-specific information is displayed in this area. These parameters cannot be changed.
Fig. 3: ‘Device’ area
Parameter Description
Product series This parameter shows the name of the series.
Device description This parameter shows the assignment of the device to a device group.
Type code This parameter shows the structured order reference of Festo products.
Manufacturer This parameter shows the name of the manufacturer.
Product key This parameter shows the Festo Product Key that uniquely identifies
the product.
Material number This parameter shows a number identifying the device.

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Online mode of the CMSH DTM
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Parameter Description
Hardware version This parameter shows the current version status of the hardware. The
identification corresponds to the NAMUR recommendation NE 53.
Software version This parameter shows the current version status of the software. The
identification corresponds to the NAMUR recommendation NE 53.
Tab. 8: Parameters in the ‘Device’ area
4.2.2 ‘HART’ area
Information specific to HART is displayed in this area. Apart from the ‘Final assembly number’ param-
eter, these parameters cannot be changed.
Fig. 4: ‘HART’ area
Parameter Description
HART revision This parameter shows the major revision number of the HART protocol
supported by the device.
Device revison This parameter shows the revision number of the device.
Software revision This parameter shows the software revision number of the device.
Hardware revision This parameter shows the hardware revision number of the device.
Final assembly number This parameter shows the Final assembly number. This number can be
used to identify a device configuration.
Tab. 9: Parameters in the ‘HART’ area

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Online mode of the CMSH DTM
4.2.3 ‘Operation unit’
Information about the operator unit is displayed in this area. The content can only be entered and
changed via the DTM.
Fig. 5: ‘Operation unit’
Parameter Description
TAG This parameter shows an application-related device identifier.
Long TAG This parameter shows an application-related device identifier.
Process unit TAG This parameter shows the allocation of the positioner to the process
system.
Description This parameter shows a description of the positioner.
Message This parameter shows a custom text. The text can be up to 32 charac-
ters.
Date This parameter shows a date assigned to the device, e.g. the installa-
tion date of the device. The date is in the format dd.mm.yyyy.
Tab. 10: Parameters in the ‘Operation unit’ area
4.3 ‘Guided setup’ menu
The most important parameters for initial commissioning of a device can be set and the initialisation
can be started in the ‘Guided setup’ menu.
These parameters as well as all other parameters and functions can also be called up and edited with
the ‘Settings’ menu è 4.4 ‘Settings’ menu.

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Online mode of the CMSH DTM
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Fig. 6: ‘Guided setup’ menu
‘Device language’ parameter
The ‘Device language’ parameter defines the display language of the device.
Value Description
English Factory setting
German —
Tab. 11: ‘Device language’ parameter
‘Actuator type’ parameter
The ‘Actuator type’ parameter defines the drive type to which the positioner is attached. When
selecting a linear drive with lever kinematics for position detection, a sine correction is activated.
Value Description
rotary Factory setting
linear —
linear with lever —
Tab. 12: ‘Actuator type’ parameter

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Online mode of the CMSH DTM
‘Exhaust position’ parameter
The ‘Exhaust position’ parameter the position that is displayed for a completely exhausted working
port (2). The effective direction of the drive can be changed with this parameter.
Value Description
0% Factory setting: exhausted at setpoint position 0%
100% Exhausted at setpoint position 100%
Tab. 13: ‘Exhaust position’ parameter
vented
ventilated
Target position [%]
Ventilation status
Fig. 7: Display of the pressurisation status for the setpoint position
‘Extension modules’ parameter
The ‘Extension modules’ parameter defines the installed extension modules. If the user activates a
connected extension module from Festo, the control response of the positioner is optimised.
Value Description
none Factory setting
flow booster The control behaviour for a flow booster from Festo is optimised.
Tab. 14: ‘Extension modules’ parameter
‘Control mode’ parameter
The ‘Control mode’ parameter defines the currently effective control mode.

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Value Description
robust Factory setting: the positioner approaches the setpoint position slowly
and accurately.
fast The positioner approaches the setpoint position quickly. It may over-
shoot.
user defined The positioner regulates according to parameters specified by the user.
User-defined controller parameters: direction-dependent P, I and D
components è 4.4.3.2 ‘User defined control parameters’ area.
Tab. 15: ‘Control mode’ parameter
4.3.1 ‘Tight close’ area
Tight closing can be activated and configured in this area.
During tight closing, the valve moves into the seat with the maximum actuating force of the actuator.
The tight closing function becomes effective when the setpoint position specification reaches the
lower value or the upper value for tight closing. When leaving the tight-closing range, a hysteresis
of 1% is implemented è Fig. 9.
Fig. 8: ‘Tight close’ area
‘Tight close mode’ parameter
The ‘Tight close mode’ parameter defines the tight closing behaviour. Tight closing can be activated on
one side or for both end positions using this parameter.
Stroke limitation and tight closing cannot be active simultaneously at one end position.
Value Description
inactive Factory setting: tight closing inactive.
lower value active Tight closing active for the lower value of the tight closing limit.
upper value active Tight closing active for the upper value of the tight closing limit.
upper and lower value
active
Tight closing active for the lower and upper value of the tight closing
limit.
Tab. 16: ‘Tight close mode’ parameter

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Online mode of the CMSH DTM
Actual position [%]
Target position [%]
Lower value
Lower value
Fig. 9: Tight closing
‘Tight close lower value’ parameter
The ‘Tight close lower value’ defines the lower value of the tight closing. If the setpoint position falls
below this value, the valve is moved to the lower end position with maximum drive force.
Value range Description
0.0 … 45.0% Permissible setting range, factory setting: 2.0%
Tab. 17: ‘Tight close lower value’ parameter
‘Tight close upper value’ parameter
The ‘Tight close upper value’ defines the upper tight closing value. If the setpoint position exceeds this
value, the valve is moved to the upper end position with maximum drive force.
Value range Description
55.0 … 100.0% Permissible setting range, factory setting: 98.0%
Tab. 18: ‘Tight close upper value’ parameter
4.3.2 ‘Automatic initialization’ area
The initialisation is started and the initialisation status of the connected device is displayed in the
‘Automatic initialization’ area. The stroke range and the controller parameters are determined during
initialisation. This involves both end positions being approached in succession independently of the
pending setpoint value.

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Online mode of the CMSH DTM
19
Fig. 10: ‘Automatic initialization’ area
Initialisation process
The positioner is not initialised in delivery status.
The initialisation process is triggered with the ‘Start initialization’ button. The progress of the initiali-
sation is shown on the display during the initialisation process in the ‘State’ field. During this time, the
initialisation process can be aborted with the ‘Stop initialization’ button.
The following statuses are displayed in succession during initialisation:
–Running Init - position sensing
–Running Init - end positions
–Running Init - control parameters
After successful initialisation, the ‘State’ of the ‘Initialized’ value is displayed. If the initialisation is not
successful or if it was aborted, the ‘Not initialized’ value is displayed in the ‘State’ field
Possible causes for unsuccessful initialisation è 5.2 Device status.
4.4 ‘Settings’ menu
4.4.1 ‘Basic parameterization’ tab
The parameterisation of the positioner can be run in the ‘Parameterization’ menu under the ‘Basic
parameterization’ tab.
4.4.1.1 ‘Set value’ area
In this area, the parameters that determine the behaviour of the positioner in relation to the setpoint
value can be configured.
Fig. 11: ‘Set value’ area
‘Setpoint direction’ parameter
The ‘Setpoint direction’ parameter defines the relationship between the externally applied setpoint
value and the setpoint position. The setpoint direction is defined independently of the type of setpoint
characteristic.

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Festo — CMSH — 2022-08
Online mode of the CMSH DTM
Value Description
rising Factory setting: the setpoint position is increased with a rising setpoint
value.
falling The setpoint position is increased with a falling setpoint value.
Tab. 19: ‘Setpoint direction’ parameter
falling
rising
Target position [%]
Setpoint [%]
Fig. 12: Setpoint direction
‘Characteristic curve type’ parameter
The ‘Characteristic curve type’ parameter defines the characteristic of the transmission characteristic
curve between setpoint value and setpoint position. The transfer characteristic is used for correction
in order to ensure a linear relationship between the flow rate and the setpoint position.
Value Description
linear Factory setting: linear characteristic curve
Equal percentage characteristic 1:25 Equal-percentage characteristic curve
Equal percentage characteristic 1:33
Equal percentage characteristic 1:50
Inversely equal percentage characteristic 25:1 Inverse equal-percentage characteristic curve
Inversely equal percentage characteristic 33:1
Inversely equal percentage characteristic 50:1
user defined User-defined characteristic curve
Tab. 20: ‘Characteristic curve type’ parameter