Samson FOUNDATION 3730-5 Instruction sheet

Series 3730
Electropneumatic Positioner
Type 3730-5
Configuration and operation over FOUNDATION™ fieldbus
Configuration
Manual
KH 8384-5 EN
Firmware version K 2.04/R 1.55
Edition October 2010
Fig. 1 · Configuration and operation over F OUNDATION™ fieldbus

Note concerning this Configuration Manual
The rotary pushbutton on the positioner allows the Type 3730-5 Positioner to be operated and
configured on site. In addition, the settings can be performed over the FOUNDATION fieldbus
network or over the SAMSON SSP interface. The Mounting and Operating Instructions
EB 8384-5 EN describe the mounting, start up and on-site operation as well as configuration
over the SAMSON SSP interface using the TROVIS-VIEW software.
This Manual (KH 8384-5 EN) describes the basic principles and parameters for operation and
configuration using FOUNDATION™fieldbus.
Note: Information on the EXPERTplus diagnostics is included in the Operating Instructions
EB 8389 EN.
2KH 8384-5 EN

Contents Page
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Principle of operation. . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Application type . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Additional equipment . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1 Configuration using TROVIS-VIEW software . . . . . . . . . . . . . . 10
2.2.2 Configuration using the NI-FBUS™ Configurator . . . . . . . . . . . . 10
2.3 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3FOUNDATION™ fieldbus block model . . . . . . . . . . . . . . . 11
4 Initialization and zero calibration of the positioner. . . . . . . . . . . 12
5 Resetting the positioner . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Status classification and condensed state . . . . . . . . . . . . . . . 14
7FOUNDATION™ fieldbus parameters . . . . . . . . . . . . . . . . . 16
7.1 Resource Block (RES). . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2 Transducer Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2.1 Advanced Positioner Transducer Block (AO TRD) . . . . . . . . . . . . 17
7.3 Function blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.3.1 Analog Output Function Block . . . . . . . . . . . . . . . . . . . . . 20
7.3.2 Proportional Integral Derivative Function Block . . . . . . . . . . . . . 22
7.3.3 Discrete Output Function Block (DO1 + DO2). . . . . . . . . . . . . . 24
7.3.4 Discrete Input Function Block (DI1 + DI2) . . . . . . . . . . . . . . . . 26
7.3.5 Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . . 28
7.3.6 Multiple Analog Output Function Block . . . . . . . . . . . . . . . . . 29
7.3.7 Multiple Analog Output Function Block . . . . . . . . . . . . . . . . . 30
7.4 Other parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4.1 Stale counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4.2 Link objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.4.3 LAS functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.5 Parameter lists. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.5.1 Resource Block (RES). . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.5.2 Advanced Positioner Transducer Block (AO TRD) . . . . . . . . . . . . 45
7.5.3 Analog Output Function Block . . . . . . . . . . . . . . . . . . . . . 88
7.5.4 Proportional Integral Derivative Function Block . . . . . . . . . . . . . 96
7.5.5 Discrete Output Function Block . . . . . . . . . . . . . . . . . . . . 111
7.5.6 Discrete Input Function Block (DI1 + DI2) . . . . . . . . . . . . . . . 117
7.5.7 Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . 122
7.5.8 Multiple Analog Input Function Block . . . . . . . . . . . . . . . . . 126
7.5.9 Multiple Analog Output Function Block . . . . . . . . . . . . . . . . 129
KH 8384-5 EN 3
Contents

Revisions of positioner firmware in comparison to previous versions
Previous New
Communication K 1.11 K 1.21
Leakage sensor at binary input 2 The connection of a leakage sensor at binary input 2 (by selecting
LEAKAGE SENSOR in CONFIG_BINARY_INPUT2 parameter of
the AO Transducer Block) causes:
4Information specified in XD_ERROR_EXT parameter in the AO
Transducer Block and the generation of a diagnostic alarm
which is logged
4The state of the binary input is reported in BINARY_INPUT2
parameter in the AO Transducer Block
Diagnostic alarm
“Device not initialized“
The diagnostic alarm “Device not initialized” is generated when
the positioner is not initialized and the condensed state is set to
“Maintenance alarm”.
Display of the operating range
FINAL_VALUE_RANGE
The correction of the operating range FINAL_VALUE_RANGE
over on-site operation of the positioner (Code 8/9) is also trans-
ferred over fieldbus in firmware version K 1.21 and higher.
Inactivated internal solenoid valve A masking allows to set whether an inactivated internal solenoid
valve generates an AO block error, resulting in a block alarm.
SOLENOID_SELECT parameter The SOLENOID_SELECT parameter in firmware K 1.21 and
higher allows to set whether a “Maintenance now“ block error of
the AO Transducer Block results in an output error in the AO
Block.
TOT_VALVE_TRAV_LIM parameter New range: 1000 … 990 000 000
K 1.22
Operating range
FINAL_VALUE_RANGE
The operating range FINAL_VALUE_RANGE of the AO Trans-
ducer Block is compared on entering it with TRANSM_PIN_POS.
If the TRANSM_PIN_POS parameter is changed, the positioner
checks whether the setting and unit match the current operating
range FINAL_VALUE_RANGE. If this is not the case, the
FINAL_VALUE_RANGE parameter is set to 0 to 100 %.
VALVE_TYPE parameter The parameter of the AO Transducer Block is set depending on
the selected PIN_POS. The last setting is kept when VALVE_TYPE
is set to OFF.
FINAL_VALUE parameter The output value is scaled with FINAL_VALUE_ RANGE in firm-
ware K 1.22 and higher, and not as previously with XD_SCALE.
Display of O/S mode in
AO Transducer Block
If the AO Transducer Block is set to O/S mode, this is indicated in
the positioner display by MAN/AUTO.
K 1.23
Internal modifications
4KH 8384-5 EN
Revisions of positioner firmware

Revisions of positioner firmware in comparison to previous versions
Previous New
K 1.24
BUS_ADDRESS parameter The bus address has the default setting of 248.
Device type In the delivery state, the device is configured as a basic device.
K 1.25
Internal modifications
K 2.01
Additional function blocks – 2x DO (Discrete Output)
– 1x IS (Input Selector)
– 1x MAI (Multiple Analog Input)
– 1x MAO (Multiple Analog Output)
New functions In the DO Function Block (Discrete Output), the following new
functions are implemented:
– Discrete analysis of on/off valves
– Start partial stroke test (PST)
– Start and reset the data logger
– Reset diagnosis
– Stop diagnosis
– Move to fail-safe position
– Lock local operation
Action on fault detection If the AO Transducer Block is in O/S mode and the condensed
state changes to "Maintenance alarm", the following actions can
be started:
– Hold last value
– Move valve to fail-safe position
– Move to a predefined fault state value
K 2.02
Partial stroke test (PST) Configuration of the partial stroke test over the FF parameters is
no longer possible. Configuration using the TROVIS-VIEW soft-
ware is still possible.
K 2.03
Partial stroke test (PST) Configuration of the partial stroke test over the FF parameters as
well as using the TROVIS-VIEW software is now possible.
The partial stroke test can be started by the binary input BE2.
K 2.04
Partial stroke test (PST) Internal modifications
KH 8384-5 EN 5
Revisions of positioner firmware

1 Introduction
This section is based upon:
4Fieldbus FOUNDATION™ Specification “Function Block Application Process Part 1 – 3“
Revision 1.7 (FF-890 to FF-892)
4Fieldbus FOUNDATION™ Specification “Positioner Transducer Block“ Revision 3.0
(FF-906)
Type 3730-5 Positioner
The microprocessor-controlled positioner compares the reference variable cyclically transmitted
over the FOUNDATION™ fieldbus network to the travel or opening angle of the control valve
and issues a corresponding output signal pressure.
Special features:
4Link Master Capability
4Easy attachment to common linear actuators over SAMSON direct attachment interface,
over NAMUR rib or to control valves with rod-type yokes acc. to IEC 60534-6 or to ro-
tary actuators according to VDI/VDE 3845
4Any desired mounting position of the positioner
4Simple one-knob, menu-driven operation
4Automatic start-up
4LCD easy to read in any mounting position due to selectable reading direction
4Integrated EXPERTplus diagnostics suitable for throttling and on/off valves and with addi-
tional partial stroke test for valves in safety-instrumented systems
4Classified status alarms acc. to NAMUR Recommendation NE 107
4Control parameters can be changed online
4Automatic monitoring of zero point
4Calibrated travel sensor without gears susceptible to wear
4Permanent storage of all parameters in non-volatile EEPROM (protection against power
failure)
4Adjustable output pressure limitation
4Adjustable tight-closing function
4Binary input for DC voltage signals
4Certified according to IEC 61508/SIL
6KH 8384-5 EN
Introduction

2 Principle of operation
The electropneumatic positioner is attached to pneumatic control valves. It is used to assign the
valve position (controlled variable x) to the control signal (reference variable w). The input sig-
nal received from a control system is compared to the travel or rotational angle of the control
valve, and a pneumatic signal pressure (output variable y) is produced.
The positioner consists of a travel sensor system proportional to resistance, an analog i/p con-
verter with a downstream booster and the electronics unit with microcontroller.
When a deviation occurs, the actuator is pressurized or vented. If required, the changes in the
signal pressure can be slowed down by a volume restriction Q. The signal pressure supplied to
the actuator can be limited by software or on site to 1.4, 2.4 or 3.7 bar.
A constant air stream to the atmosphere is created by the flow regulator (9) with a fixed set
point. The air stream is used to purge the inside of the housing as well as to optimize the air ca-
pacity booster. The i/p module (6) is supplied with a constant upstream pressure by the pres-
sure regulator (8) to make it independent of the supply air pressure.
The positioner communicates and is powered using IEC 61158-2 transmission technology con-
forming to the FOUNDATION™ fieldbus specification.
KH 8384-5 EN 7
Principle of operation
w
x
Q
%
S
mm
GG
PD
Serial
Interface 16
15 BE2
BE1
112
4
13
20
17 18
19
24V DC
5
3
12
6
7
8
10
1
14
9
x
y
Fig. 2 · Functional diagram
1 Control valve
2 Travel sensor
3 PD controller
4 A/D converter
5 Microcontroller
6 i/p module
7 Pneumatic booster
8 Pressure regulator
9 Flow regulator
10 Volume restriction
11* Inductive limit switch
12* Solenoid valve
13 IEC 61158-2
interface module
14 Binary input BE1
(passive)
15* Binary input BE2 (active)
16 LCD
17* Solenoid valve control
18 Galvanic isolation
19 D/A converter
20 Serial interface (SSP)
* Option

As a standard feature, the positioner comes with a binary input used to signalize process infor-
mation over the FOUNDATION™ fieldbus network.
The extended EXPERTplus diagnostics are integrated into the positioner. They provide informa-
tion on the positioner and generate diagnostic and status messages, which allow faults to be
pinpointed quickly.
2.1 Application type
Two application types for the valve are available: Control valve and Open/Close (on/off)
valve. The manual mode (MAN) and the automatic mode (AUTO) can be selected with
both application types.
Depending on the application type that has been selected, the positioner behaves differently in
the automatic mode (AUTO) :
Control over FOUNDATION™ fieldbus is performed over the AO Function Block (control valve)
and over the DO1 Function Block (on/off valve). The application type can be set in the Resource
Block over the SELECT_DO_1 parameter or at the positioner using Code 49 - h0.
Control valve Open/Close valve
AUTO The positioner follows the reference variable
continuously.
The valve position (current position) appears in
% on the display.
Discrete analysis of the reference variable.
The valve position (current position) in %
and O/C (Open/Close) appear in alter-
nating sequence on the display.
MAN The positioner follows the reference variable entered over local operation.
Note:
–
Depending on the application type, certain diagnostic functions cannot be performed or
analyzed. Refer to EB 8389 EN on EXPERTplus valve diagnostics.
–
In manual mode, an on/off valve can be moved past 100 % of the nominal range (with
the closed position for ATO) or below 0 % of the nominal range (with the closed position
for ATC).
8KH 8384-5 EN
Principle of operation

2.2 Additional equipment
Solenoid valve
If the operating voltage for the solenoid valve (12) fails, the supply pressure for the i/p module is
vented to the atmosphere. The positioner can no longer operate and the control valve moves to
the fail-safe position determined by the actuator, regardless of the reference variable.
NOTICE
In manual mode (MAN), the manual set point is also reset to 0 %. A different manual set
point must be entered again (Code 1).
Inductive limit switch
The rotary shaft of the positioner carries an adjustable tag which actuates the installed proximity
switch.
External position sensor
In this version, only the sensor is mounted to the control valve. The positioner is located sepa-
rately from the valve. The connection of x and y signals to the valve is established by cable and
piping for air (only without inductive limit switch).
Binary inputs
Binary input BE1 (14):
The positioner has a standard binary input for DC voltage signals, which allows process infor-
mation to be exchanged over the FOUNDATION™fieldbus network.
Binary input BE2 (15):
This binary input is optional. It is an active input which connects a floating contact which is pow-
ered by the positioner. The switching state of the binary input can be indicated over the
FOUNDATION™fieldbus network.
Note: The binary inputs are configured in the DI Function Blocks.
KH 8384-5 EN 9
Principle of operation

2.2.1 Configuration using TROVIS-VIEW software
The positioner can be configured using the TROVIS-VIEW Configuration and Operator Inter-
face software.
The positioner is equipped with an additional digital SERIAL INTERFACE to connect the RS-232
or USB port of the computer to the positioner over an adapter cable.
The TROVIS-VIEW software enables the user to easily set parameters in the positioner and view
process parameters online.
The Mounting and Operating Instructions EB 8384-5 EN contain a description on how to con-
figure and operate the positioner over TROVIS-VIEW.
2.2.2 Configuration using the NI-FBUS™ Configurator
The NI-FBUS™ Configurator from National Instruments can also be used to configure the
positioner. For this purpose, an interface card must be installed in a computer to connect it to the
FOUNDATION™ fieldbus.
The integrated function blocks can be linked using the NI-FBUS™ Configurator.
2.3 Communication
The positioner is completely controlled over the digital signal transmission implemented accord-
ing to FOUNDATION™ fieldbus specification.
Data are transmitted as bit-synchronous current modulation at a rate of 31.25 kbit/s over
twisted-pair cables conforming to IEC 61158-2.
Note: In the case, complex functions are started in the positioner, which require a long calcula-
tion time or lead to a large quantity of data being stored in the volatile memory of the
positioner, the alert “busy” is issued over DD.
This alert is notafaultalarmand can simply be confirmed.
10 KH 8384-5 EN
Principle of operation

3FOUNDATION™ fieldbus block model
FOUNDATION™ fieldbus assigns all the functions and data of a device to different types of
blocks. Each type of block has a different range of tasks to fulfill in the block model.
The following types of blocks are implemented in the SAMSON Type 3730-5 Positioner:
4Resource Block (RES)
The Resource Block contains all the specific characteristics associated with a device on the
Fieldbus, for example, device name, manufacturer number and serial number.
A device can only have one Resource Block.
4Function blocks
Function blocks are responsible for the control behavior of a FOUNDATION™ fieldbus de-
vice. A FOUNDATION™ fieldbus application can be configured by connecting the inputs
and outputs of function blocks.
The following function blocks are implemented in the Type 3730-5:
– 1x Proportional Integral Derivative Function Block (PID); execution time 20 ms
– 1x Analog Output Function Block (AO); execution time 30 ms
– 2x Discrete Input Function Blocks (DI); execution time 20 ms
– 2x Discrete Output Function Blocks (DO); execution time 30 ms
– 1x Multiple Analog Input Function Block (MAI); execution time 50 ms
– 1x Multiple Analog Output Function Block (MAO); execution time 50 ms
– 1x Input Selector Function Block (IS); execution time 30 ms
4Transducer Blocks (TRD)
Each AI or AO Function Block has a Transducer Block which contains all data and de-
vice-specific parameters to link the device to the process value (sensor or final control ele-
ment).
The following Transducer Blocks (corresponding to the Function Blocks) are implemented:
– 1x Advanced Positioner Transducer Block (AO TRD)
– 2x Discrete Input Transducer Blocks (DI TRD)
– 2x Discrete Output Transducer Blocks (DO TRD)
– 1x Multiple Analog Input Transducer Block (MAI TRD)
– 1x Multiple Analog Output Transducer Block (MAO TRD)
KH 8384-5 EN 11
FOUNDATION™ fieldbus block model

4 Initialization and zero calibration of the positioner
Both an initialization and a zero calibration can be started over the XD_COMMAND parame-
ter of the AO Transducer Block. The relevant parameters for a MAX/NOM initialization and the
diagnostic functions of EXPERTplus are listed below (also refer to EB 8389 EN):
4APPLICATION_TYPE_OC_CONTROL (type of application)
4INIT_METHOD (initialization method)
4TRANS_PIN_POS (pin position)
4RATED_TRAVEL (required rated travel for NOM initialization)
4PRESSURE_LIMIT (setting of pressure limit)
4SELECT_EMERGENCY_MODE (setting when the travel sensor is defective)
4DEVICE_CHARACTERISTIC (settings for actuator and other accessories)
MODEL (actuator with or without spring return)
BOOSTER (pneumatic volume booster)
STUFFING_BOX (packing to seal the plug stem)
XD_COMMAND ("Start Initialization")
XD_COMMAND_STATE (initialization status)
Note: Read the corresponding section on starting up the positioner in the Mounting and Op-
erating Instructions EB 8384-5 EN.
12 KH 8384-5 EN
Initialization and zero calibration of the positioner

5 Resetting the positioner
The start-up and diagnostic data (in Code 36 Std) can be reset over the XD_COMMAND (41)
parameter of the AO Transducer Block.
The resetting of the device data and the wiring of the function blocks to the values stipulated in
the FOUNDATION™ fieldbus specification are performed using the DEFAULTS value in the
RESTART (16) parameter of the Resource Block (RES).
A warm start of the positioner is performed using the PROCESSOR value in the RESTART (16)
parameter of the Resource Block (RES).
The entire diagnostic data as well as the individual messages and histograms are reset over the
RESET_STATUS_MESSAGE_DIAG (147) parameter of the AO Transducer Block.
KH 8384-5 EN 13
Resetting the positioner

6 Status classification and condensed state
All status alarms are classified in the positioner to report an error that has occurred. The status
classification can be changed over the following FOUNDATION™ fieldbus parameters in the
AO Transducer Block (AO TRD):
4ERROR_OPTION_INIT_FAILURE (36):
Masking of the initialization error
4ERROR_OPTION_OPERATION_FAILURE (37):
Masking of the operational error
4ERROR_OPTION_HW_FAILURE (38):
Masking of the hardware error
4ERROR_OPTION_DATA_FAILURE (39):
Masking of the data error
4ERROR_OPTION_ENH_DIAGNOSTIC (40 bis 44):
Masking of the status and fault alarms generated by the diagnostics
To provide a better overview, the classified alarms are summarized in a condensed state
(CONDENSED_STATE (59) in the RES Block). Besides the CONDENSED_STATE parameter, the
condensed state can be issued to the discrete output OUT_D of the DI Function Blocks (DI1 +
DI2).
Possible condensed states include:
0OK
1 Maintenance
required
The positioner still performs its control task (with restrictions). A maintenance re-
quirement or above average wear has been determined. The wear tolerance will
soon be exhausted or is reducing at a faster rate than expected. Maintenance is
necessary in the medium term.
2 Maintenance
demanded
The positioner still performs its control task (with restrictions). A maintenance de-
mand or above average wear has been determined. The wear tolerance will soon
be exhausted or is reducing at a faster rate than expected. Maintenance is neces-
sary in the short term.
3 Maintenance
alarm
The positioner cannot perform its control task due to a functional fault in the device
or in one of its peripherals or an initialization has not yet been successfully com-
pleted.
7 Function check Test or calibration procedures are being performed. The positioner is temporarily
unable to perform its control task until this procedure is completed.
In addition to the condensed state, the block error alarms (BLOCK_ERR) from the Resource Block
and Transducer Block can also be assigned to the events.
In this case, the individual alarms must be classified in the ERROR_OPTION_… (Index 36 to 44)
14 KH 8384-5 EN
Status classification and condensed state

parameters in the AO Transducer Block (AO TRD) with another status for block errors. The fol-
lowing classifications are possible:
• No message
• Device needs maintenance soon
• Device needs maintenance now
The block error (BLOCK_ERR) results from the summary of classified alarms that are active.
KH 8384-5 EN 15
Status classification and condensed state

7 FOUNDATION™ fieldbus parameters
Several parameters can only be modified in certain modes (see Read/write capability in the pa-
rameter description). In this case, not the actual mode is decisive, but the target mode.
7.1 Resource Block (RES)
The Resource Block contains all the data that identify the device. It is similar to an electronic de-
vice tag. Resource Block parameters include device type, device name, manufacturer ID, serial
number as well as parameters that affect the behavior of all other blocks of the device.
Refer to page 33 for the list of parameters.
Note: All time specifications in the Resource Block are specified in the unit of 1/32 ms ac-
cording to the F
OUNDATION™ fieldbus Specification Version 1.7.
In the Device Description Library supplied by
Fieldbus FOUNDATION upon which the de-
vice description of Type 3730-5 is also based, these parameters are incorrectly specified as
the unit of ms. The specified values supplied by the device are, however, always to be inter-
preted as the unit of 1/32 ms.
16 KH 8384-5 EN
FOUNDATION™ fieldbus parameters

7.2 Transducer Blocks
Transducer Blocks link the function blocks to the input and output variables of a field device. For
example, the DI Function Blocks are linked to the physical binary inputs, an internal solenoid
valve, the current valve position or the condensed state of the positioner. This link to the various
Transducer Blocks is made over the CHANNEL parameter of the individual function blocks. The
table below shows how CHANNEL is assigned to the function blocks:
CHANNEL Function Block
1 DI1
2 DI2
3AO
4 MAI
5 MAO
6 DO1
7 DO2
The Transducer Blocks DI TRD, DO TRD, MAI TRD and MAO TRD are implemented according to
the FOUNDATION™ fieldbus specification and do not contain any manufacturer-specific pa-
rameters.
7.2.1 Advanced Positioner Transducer Block (AO TRD)
The Advanced Positioner Transducer Block (AO TRD) contains an output value from an up-
stream Analog Output Function Block. This value is used to position a control valve. The block
contains parameters to adapt the positioner to the actuator and valve as well as for valve com-
missioning and diagnostics.
Action on fault detection
The action on fault detection for the "Maintenance alarm" state in the condensed state can be
configured in the XD_FSTATE_OPT parameter as follows:
• Hold last value
• Move to fail-safe position
• Move to fault state value XD_FSTATE_VAL
The action on fault detection to transfer to O/S mode can be configured in the XD_OOS_OPT
parameter as follows:
• Hold last value
KH 8384-5 EN 17
FOUNDATION™ fieldbus parameters

• Move to fail-safe position
• Move to fault state value XD_FSTATE_VAL
The AO Transducer Block (AO TRD) can still set an output error in the AO Function Block. For
this purpose, the following events to activate an output error can be configured in the
ALARM_OPTIONS parameter:
• No (never)
• Local Override (when the AO TRD is in the LOCAL OVERRIDE mode, i.e. the positioner is
set locally in the SAFE mode or an internal solenid valve is activated)
• MAN (when the AO TRD is in MAN mode)
• Block alarm (when the AO TRD has a MAINTENANCE NOW block error)
• AO TRD fault state (when the action on fault detection is active)
• AO O/S set fault state (when the AO Function Block in the O/S mode, the valve is
moved to the FSTATE_VAL of the AO Function Block)
Parameter description (Fig. 3)
Control valve
FINAL_VALUE Reference variable of upstream AO Function Block (control valve)
FINAL_POS_VALUE Valve position after decharacterization
WORKING_SP Reference variable after scaling, characterization, end position function
(corresponds to the reference variable of the control algorithm)
WORKING_POS Actual valve position
READBACK_SELECT Select parameter which is issued to READBACK of AO Function Block.
On/off valve
FINAL_VALUE_D Discrete reference variable of upstream DO Function Block
FINAL_POS_VALUE_D Discrete valve position after taking the direction of action into account
WORKING_SP_D Reference variable after taking the direction of action into account (corre-
sponds to the reference variable of the control algorithm)
WORKING_POS_D Actual discrete valve position
Refer to page 45 for the list of parameters
18 KH 8384-5 EN
FOUNDATION™ fieldbus parameters

KH 8384-5 EN 19
FOUNDATION™ fieldbus parameters
MODE=AUTO
SetFailSafePos
AO FB
CAS_IN
READBACK
MODE
Control
Scaling
FVR FINAL_VALUE SIGNAL_ACTION
Characterization
End position function
Characterization
End position function
MODE=AUTO MODE
Open/close FINAL_VALUE_D SIGNAL_ACTION
FINAL_POS_VALUE_D SIGNAL_ACTION
WORKING_SP_D WORKING_SP
WORKING_POS_D
FINAL_POS_VALUE
RB_SELECT
SIGNAL_ACTION
WORKING_POS
DO FB
OUT_D
DI FB
OUT_D
Fig. 3 · Advanced Positioner Transducer Block (AO TRD)
Discrete valve position 1Valveclosed 2Valveopen 3 Intermediate valve position

7.3 Function blocks
7.3.1 Analog Output Function Block
The AO Function Block processes an analog signal from an upstream block (e.g. PID Function
Block) to an output value that can be used for the downstream Transducer Block (e.g. valve
positioner). It contains scaling functions and ramp functions as well as other functions. The gen-
erated output value OUT is forwarded over CHANNEL to the downstream Transducer Block.
The AO Function Block contains its set point SP depending on the mode (MODE_BLK)
• Manually entered SP (AUTO)
• Directly from an upstream function block (CAS_IN)
• Directly from a fieldbus host system (RCAS_IN)
An internal working process value PV is generated from SP, while taking into account:
• SP_HI_LIM (setpoint high limit)
• SP_LO_LIM (setpoint low limit)
• SP_RATE_DN (setpoint downward rate limit in AUTO mode)
• SP_RATE_UP (setpoint upward rate limit in AUTO mode)
• PV_SCALE (range of the process variable (PV) (start, end, unit and decimal point))
The output value OUT is generated, while taking into account:
• XD_SCALE (range of the OUT value (start, end, unit and decimal point))
• IO_OPTS (determines the input/output action of the AO TRD, e.g. action on fault detec-
tion)
Action on fault detection
Action on fault detection taken during a communication fault (BAD status)
• The last valid value is used by default.
• By selecting FAULT STATE TO VALUE in the IO_OPTS parameter, the valve moves to the
fault state value FSTATE_VAL configured in the AO Function Block.
• FSTATE_TIME defines the length of time that the AO block will wait to activate the fault
state.
Action on fault detection in OUT OF SERVICE (O/S) mode
• After the AO Function Block has moved to O/S mode, the last valid output value is kept
by default.
• By selecting AO O/S set fault state in the ALARM_OPTIONS parameter of the AO TRD,
the valve moves to the fault state value FSTATE_VAL configured in the AO Function Block.
20 KH 8384-5 EN
FOUNDATION™ fieldbus parameters