Rockwell Automation Library of Process Objects: Weigh Scale
Dosing (P_DoseWS)
Version 3.5
IMPORTANT
This manual applies to the Rockwell Automation Library of Process Objects version 3.5 or earlier.
For Rockwell Automation Library of Process Objects version 5.0, see
• PROCES-RM200
For Rockwell Automation Library of Process Objects version 4.0 or later, use the following manuals:
• PROCES-RM013 contains logic instructions
• PROCES-RM014 contains display elements
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to
familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws,
and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required
to be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the
use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or
liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or
software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation,
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IMPORTANT
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Trademarks not belonging to Rockwell Automation are property of their respective companies.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 20173
Table of Contents
Notes:
4Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Preface
Software Compatibility and
Content Revision
Table 1 - Summary of Changes
TopicPage
Visualization Files: Global Objects (.ggfx) - Process Diagnostic Objects11
For the latest compatible software information and to download the Rockwell
Automation® Library of Process Objects, see the Product Compatibility and
Download Center at
Rockwell Automation Library of Process Objects: Common
Alarm Block (P_Alarm) Reference Manual, publication
SYSLIB-RM002
Rockwell Automation Library of Process Objects: Common
Mode Block (P_Mode) Reference Manual, publication
SYSLIB-RM005
PROCES-SG001
PROCES-RM001
PROCES-RM002
VIEWME-UM004
VIEWSE-UM006
1756-PM010
Provides information to assist with equipment
procurement for your PlantPAx system.
Provides characterized recommendations for
implementing your PlantPAx system.
Provides general considerations for the PlantPAx system
library of process objects.
Provides details on how to use this software package for
creating an automation application.
Provides details on how to use this software package for
developing and running human-machine interface
(HMI) applications that can involve multiple users and
servers, distributed over a network.
Provides information for designing, configuring, and
programming Add-On Instructions.
Details how to monitor an input condition to raise an
alarm. Information includes acknowledging, resetting,
inhibiting, and disabling an alarm. Generally the
P_Alarm faceplate is accessible from the Alarms tab.
Explains how to choose the Mode (owner) of an
instruction or control strategy. The Mode instruction is
usually embedded within other instructions to extend
their functionality. It is possible to use a standalone
Mode instruction to enhance a program where modes
are wanted.
You can view or download publications at
http:/www.rockwellautomation.com/literature/. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or
Rockwell Automation sales representative.
6Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
The P_DoseWS (Weigh Scale Dosing) Add-On Instruction controls an
ingredient addition that uses a weigh scale to measure the quantity of ingredient
added. The weigh scale can be on the receiving vessel (gain in weight) or on the
sourcing vessel (loss in weight). The weigh scale can be connected via an analog
input, device network, or other connection.
Global Object
Faceplate
Add-On Instruction
Guidelines
Use this instruction in these situations:
• You want to control basic dosing (ingredient addition) with basic features,
s bulk/dribble rate selection, preact, automatic preact adjustment,
such a
and the ability to start, pause, and resume flow.
ou are measuring the quantity of ingredient added to a destination vessel
• Y
(g
ain in weight) or the quantity transferred from a source vessel (loss in
weight) by using a weigh scale. The scale provides a weight value and can
be interfaced via an analog input card, network, or other means.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 20177
Weigh Scale Dosing (P_DoseWS)
Do not use this instruction in these situations:
• You want to measure the quantity of ingredients transferred with a
flowmeter. Use the P_DoseFM instruction instead.
ou need to control precision blending. This instruction does not include
• Y
capabil
ity for controlled-rate addition, such as ratio control, digital
blending, or precision blending. Contact your Rockwell Automation
representative for a blending solution.
ou need only a totalizer (integrator). Use the built-in TOT instruction
• Y
instead.
ou need only to display a weigh scales’s weight or generate high and low
• Y
weig
ht alarms. Use the P_AIn Analog Input Add-On Instruction instead.
You could need additional logic in these situations:
ou need more complicated sequencing, including special actions when
• Y
restarting, aborting, or holding an addition. This sort of sequencing is a
good candidate for an equipment phase. Equipment phase logic can drive
the P_DoseWS instruction by using its Program mode commands and
settings.
he material transfer equipment requires complicated startup and
• T
tdown logic. You can provide this logic separately and use the
shu
P_DoseWS outputs to trigger the logic for startup and shutdown of
ingredient delivery.
8Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Functional Description
The following diagram shows the functional characteristics of the P_DoseWS
Add-On Instruction.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 20179
Weigh Scale Dosing (P_DoseWS)
The P_DoseWS instruction provides the following capabilities:
• Provides linear scaling of the input weight value from raw (input card)
units to engineering (display) units.
ses a software tare of the scale to establish the zero-quantity starting
• U
po
int for transfer. Once the scale is tared, the instruction checks for
unrequested flow, that is, an increase or decrease in scale weight before
flow is actually started, and raises a tare fault alarm if such a weight change
occurs.
rovides a rate of weight change calculation (differentiation with respect
• P
time) to generate an inferred flow rate. The calculated rate is filtered and
to
has a low cutoff, so the rate is reported as zero when the change in weight is
only from noise on the input weight signal.
rovides outputs to control associated equipment, such as pumps and
• P
valves to start and stop flow. The operator or the program can start the
ingredient addition, then pause and resume as needed.
onitors the status of controlled equipment, such as pumps and valves.
• M
Fl
ow is stopped and an alarm is raised on an equipment fault or if the
equipment fails to respond as commanded.
onitors the weight PV input quality and communication status and
• M
pr
ovides indication of uncertain or bad weight PV. Flow is stopped and an
alarm is raised on a bad PV or communication loss.
rovides program or operator entry of a quantity to deliver (setpoint) and
• P
calcu
lates the quantity remaining to deliver and percent complete during
delivery.
Required Files
Add-On Instructions are reusable code objects that contain encapsulated logic
that can streamline implementing your system. This lets you create your own
instruction set for programming logic as a supplement to the instruction set
provided natively in the ControlLogix® firmware. An Add-On Instruction is
defined once in each controller project, and can be instantiated multiple times in
your application code as needed.
Controller File
The P_DoseWS_3_5-00_AOI.L5X Add-On Instruction must be imported into
the controller project to be used in the controller configuration. The service
release number (boldfaced) can change as service revisions are created.
10Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Visualization Files
This Add-On Instruction has associated visualization files that provide a
common user interface. These files can be downloaded from the Product
Compatibility and Download Center at
The visualization file dependencies require Process Library content imports to
occur in a specific order as reflected in the following tables:
• Images
• Global Objects
• Standard Displays
• HMI Tags
• Macros
Images are external graphic files that can be used in displays. They must be
imported for FactoryTalk View to make use of them.
When PNG files are imported, they are renamed by FactoryTalk View with
a .bmp file extension, but retain a .png format.
Table 2 - Visualization Files: Images (.png)
FactoryTalk View SE SoftwareFactoryTalk View ME SoftwareDescription
All .png files in the images folderAll .png files in the images folderThese are the common icons used in the global objects and
standard displays for all Process Objects.
The Global Object files (.ggfx file type) in the following table are Process Library
display elements that are created once and referenced multiple times on multiple
displays in an application. When changes are made to a Global Object, all
instances in the application are automatically updated.
Table 3 - Visualization Files: Global Objects (.ggfx)
FactoryTalk View SE SoftwareFactoryTalk View ME SoftwareDescription
(RA-BAS) Common Faceplate Objects(RA-BAS-ME) Common Faceplate ObjectsGlobal objects used on process object faceplates.
(RA-BAS) Process Alarm Objects(RA-BAS-ME) Process Alarm ObjectsGlobal objects used for managing alarms on process
(RA-BAS) Process Diagnostic Objects(RA-BAS-ME) Process Diagnostic ObjectsDiagnostic global objects used on process object
(RA-BAS) Process Faceplate Analog Objects(RA-BAS-ME) Process Faceplate Analog ObjectsAnalog global objects used on process object faceplates.
(RA-BAS) Process Faceplate Misc Objects(RA-BAS-ME) Process Faceplate Misc ObjectsMiscellaneous global objects used on process object
(RA-BAS) Process Graphics Library(RA-BAS-ME) Process Graphics LibraryProcess global object device symbols used to build
(RA-BAS) Process Help Objects(RA-BAS-ME) Process Help ObjectsGlobal objects used for all process objects help displays.
(RA-BAS) Process Mode Objects(RA-BAS-ME) Process Mode ObjectsGlobal objects used for managing modes on process
object faceplates.
faceplates.
faceplates.
process graphics
object faceplates.
The Standard Display files (.gfx file type) in the following table are the Process
Library displays that you see at runtime.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201711
Weigh Scale Dosing (P_DoseWS)
Table 4 - Visualization Files: Standard Displays (.gfx)
FactoryTalk View SE SoftwareFactoryTalk View ME SoftwareDescription
(RA-BAS) Common-AnalogEditN/AFaceplate used for analog input data entry. The FactoryTalk
(RA-BAS) P_Alarm-Faceplate(RA-BAS-ME) P_Alarm-FaceplateThe faceplate that is used for managing alarms for
(RA-BAS) P_Alarm-Help(RA-BAS-ME) P_Alarm-HelpAlarm Help information that is accessed from the
(RA-BAS) P_DoseWS-Faceplate(RA-BAS-ME) P_DoseWS-FaceplateThe faceplate that is used for the object
(RA-BAS) P_DoseWS-Quick(RA-BAS-ME) P_DoseWS-QuickThe Quick display that is used for the object
(RA-BAS) P_Mode-Config(RA-BAS-ME) P_Mode-ConfigThe Configuration Display used to configure the
(RA-BAS) P_Mode-Help(RA-BAS-ME) P_Mode-HelpMode Help information that is accessed from the
(RA-BAS) Process Dose Family-Help(RA-BAS-ME) Process Dose Family-HelpThe Help display for Dose objects
View ME faceplates use the native analog input data entry
so no file is required.
the object.
P_AIarm faceplate.
P_Mode object.
Help faceplate.
The Channel faceplate used for the object.
Use this file if your Analog Input has an associated
P_AIChan object and you enable navigation to its
faceplate from the Analog Input faceplate.
Channel Help information that is accessed from the
P_AIChan Help faceplate.
Use this file if you use the Analog Input Channel faceplate.
HMI Tags are created in a FactoryTalk View ME application to support tab
switching on Process Library faceplates. The HMI tags may be imported via the
comma-separated values file (.csv file type) in the following table.
Table 5 - Visualization Files: HMI Tags (.csv)
FactoryTalk View SE SoftwareFactoryTalk View ME SoftwareDescription
N/AFTVME_PlantPAxLib_Tags_3_5_xx.csv
where xx = the service release number.
These tags must be imported into the
FactoryTalk View ME project to support switching tabs on
any Process Object faceplate.
12Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Controller Code
This section describes the parameter references for this Add-On Instruction.
Weigh Scale Dosing Input Structure
Input parameters include the following:
• Input data elements (Inp_) are typically used to connect field inputs from
I/O modules or signals from other objects.
nfiguration data elements (Cfg_) are used to set configurable
• Co
capabil
ities and features of the instruction.
mmand data elements (PCmd_, OCmd_, MCmd_) are used by
• Co
pr
ogram logic, operators, and maintenance personnel to request
instruction actions.
etting data elements (PSet_, OSet_, MSet_) are used by program logic,
• S
ope
rators, and maintenance personnel to establish runtime setpoints,
thresholds, and so forth. Set_ data elements (without a leading P, O, or M)
establish runtime settings regardless of role or mode.
Table 7 - P_DoseWS Input Parameters
Input ParameterData
Type
EnableInBOOL1Ladder Diagram:
Inp_WeightPVREAL0.0Weight from weigh scale (unscaled).
Inp_RunFdbkBOOL01 = Controlled equipment is delivering (running).
Inp_DribbleFdbkBOOL01 = Controlled equipment is delivering at dribble.
Inp_StopFdbkBOOL01 = Controlled equipment is confirmed stopped.
Inp_PVBadBOOL0Bad Signal Quality/Communication Status for Inputs (1 = Bad, 0 = OK). If PV is
Inp_PVUncertainBOOL0Uncertain Quality for Inputs (1 = Uncertain, 0 = OK). This is optional status for the
Inp_CtrldEqpFaultBOOL0Controlled equipment device or I/O status:
Inp_SimBOOL0Simulation input. When set to 1, the instruction simulates a working dosing action.
Inp_ResetBOOL0Input parameter used to programmatically reset alarms. When set to 1, all alarms
If the rung-in condition is true, the instruction’s Logic routine executes. If the rungin condition is false, the instruction’s EnableInFalse routine executes.
Function Block Diagram:
If true, or not connected, the instruction’s Logic routine executes. If the parameter
is exposed as a pin and wired, and the pin is false, the instruction’s EnableInFalse
routine executes.
Structured Text:
No effect. The instruction’s Logic routine executes.
read from an analog input, then this is normally read from the analog input
channel fault status.
input that can be used to drive the status of the output (Sts_PVUncertain).
0 = OK
1 = Fail
When set to 0, the instruction controls dosing normally.
requiring reset are reset.
0 = Running increases weight (Transfer In).
0 = Run full flow until complete.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201713
Weigh Scale Dosing (P_DoseWS)
Table 7 - P_DoseWS Input Parameters
Input ParameterData
Type
Cfg_UseEqpFdbkBOOL01 = Use run/dribble/stop feedback.
Cfg_AutoAdjPreactBOOL01 = Enable automatic adjustment of preact after each tolerance check.
Cfg_SetTrackBOOL1This parameter is used to set up bumpless behavior of setting parameters when
Cfg_HasChanObjBOOL01 = Tells HMI a Channel object (P_AIChan, etc.) is used for Inp_WeightPV.
Cfg_PCmdClearBOOLMode.Cfg_PCmdClear1When this parameter is 1, program commands are cleared once they are acted
Cfg_ProgDefaultBOOLMode.Cfg_ProgDefault0This parameter defines the default mode. When this parameter is 1, the mode
Cfg_ShedOnEqpFaultBOOL01 = Stop delivery and alarm on equipment fault.
Cfg_HasOverTolAlmBOOLOverTol.Cfg_Exists0These parameters determine whether the corresponding alarm exists and is
Cfg_HasUnderTolAlmUnderTol.Cfg_Exists
Cfg_HasTareFaultAlmTareFault.Cfg_Exists
Cfg_HasEqpFaultAlmEqpFault.Cfg_Exists
Cfg_OverTolResetReqdBOOLOverTol.Cfg_ResetReqd0These parameters determine whether a reset is required to clear the alarm status.
Cfg_UnderTolResetReqdUnderTol.Cfg_ResetReqd
Cfg_TareFaultResetReqdTareFault.Cfg_ResetReqd
Cfg_EqpFaultResetReqdEqpFault.Cfg_ResetReqd
Cfg_OverTolAckReqdBOOLOverTol.Cfg_AckReqd1These parameters determine whether an acknowledgement is required for an
Cfg_UnderTolAckReqdUnderTol.Cfg_AckReqd
Cfg_TareFaultAckReqdTareFault.Cfg_AckReqd
Cfg_EqpFaultAckReqdEqpFault.Cfg_AckReqd
Alias ForDefaultDescription
0 = Assume equipment state.
switching modes. When this parameter is 1, in Program mode the operator
settings track the program settings; in Operator mode the program settings track
the operator settings; and the simulation inputs match the output values
(transitions are bumpless).
When this parameter is 0, the operator settings and program settings are not
modified by this instruction. In this case, when the mode is changed, the effective
value of the setting can change depending on the program-set and operator-set
values.
IMPORTANT: The name of the Channel object in the controller must be this
object's name with the suffix ‘_Chan’. For example, if your P_DoseWS object has
the name ‘DoseWS123’, then its Channel object must be named
‘DoseWS123_Chan’.
upon. When set to 0, program commands remain set until cleared by the
application program logic.
IMPORTANT: Clearing this parameter online can cause unintended program
command execution.
defaults to Program if no mode is being requested. When this parameter is 0, the
mode defaults to Operator if no mode is being requested.
IMPORTANT: Changing this parameter online can cause unintended mode
changes.
0 = Alarm only on Equipment fault.
checked or if the alarm does not exist and is not used. When these parameters are
1, the corresponding alarm exists.
When these parameters are 1, the alarm is latched ON when the alarm occurs. After
the alarm condition returns to normal, a reset is required to clear the alarm status
(for example, OCmd_Reset, Inp_Reset, or EqpFault.OCmd_Reset are required to
clear Alm_EqpFault alarm after the alarm is set and the equipment returns to
normal). When these parameters are 0, no reset is required and the alarm status is
cleared when the alarm condition returns to normal.
IMPORTANT: If the reset clears the alarm, it also acknowledges the alarm.
alarm. When these parameters are 1, the acknowledge (ack) bit is cleared when
the alarm occurs. An acknowledge command (for example, PCmd_EqpFaultAck or
EqpFault.OCmd_Ack) is required to acknowledge the alarm. When set to 0, the
Acknowledge bit is set when an alarm occurs indicating an acknowledged alarm
and no acknowledge command is required.
14Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Table 7 - P_DoseWS Input Parameters
Weigh Scale Dosing (P_DoseWS)
Input ParameterData
Type
Cfg_OverTolSeverityINTOverTol.Cfg_Severity750These parameters determine the severity of each alarm. This drives the colors and
Cfg_PVEUMaxREAL10000.0PV (Output) maximum for scaling to engineering units.
Cfg_MaxQtyREAL1.0E+38Maximum allowed quantity to deliver (setpoint) (engineering units).
Cfg_RateTimeREAL1.0Time factor for rate (60 for /min, 3600 for /hr) (seconds).
Cfg_RateFiltTCREAL0.1Filter time constant (seconds) for calculated rate.
Cfg_TareFaultLimREAL1.0Amount (engineering units) scale can drift after tare before starting flow without
Cfg_SettleTREAL1.0Time to allow scale to settle before allowing tolerance check (seconds).
Cfg_BumpTREAL0.0Bump (manual top-off ) Time (seconds), 0.0 = use Bump command as a ‘jog’.
Cfg_AutoAdjPctREAL10.0Percentage of delivery error to auto-adjust preact (%).
Cfg_SimStartWtREAL0.0Weight to start from (tare to) in simulation (engineering units).
Cfg_SimRateREAL1.0Rate at which to deliver when running in simulation (engineering units/rate time).
Cfg_SimDribbleRateREAL0.1Rate at which to dribble when running in simulation (engineering units/rate time).
Cfg_FaultTDINT10Time for equipment feedback to follow output before fault (seconds).
Cfg_OperKeepSINT2#0000_0000Operator keeps control in Program mode:
Cfg_ProgKeepSINT2#0000_0000Program keeps control in Operator mode:
PSet_SPREAL0.0Program setting of total quantity to deliver (engineering units).
PSet_DribbleQtyProgram setting of quantity to dribble (engineering units).
PSet_PreactProgram setting of quantity before total to stop flow (engineering units).
PSet_TolHiProgram setting of high (excess) tolerance limit.
PSet_TolLoProgram setting of low (shortage) tolerance limit.
PSet_OwnerDINT0Program owner request ID (nonzero) or Release (zero).
Alias ForDefaultDescription
symbols that are used to indicate alarm status on the faceplate and global object.
The following are valid values:
1…250 = Low
251…500 = Medium
501…750 = High
751…1000 = Urgent
IMPORTANT: For FactoryTalk View software version 7.0, these severity parameters
drive only the indication on the global object and faceplate. The Alarms and Events
definition of severity drives the color and symbol that is used on the alarm banner
and alarm summary as well as the value returned by FactoryTalk Alarms and Events
display commands.
IMPORTANT: The P_DoseWS instruction supports reverse scaling; either the raw
(Input) or engineering (Scaled) range can be reversed (maximum less than
minimum).
faulting.
Bit .0 = 1 operator keeps Start/Stop
Bit .1 = 1 Operator keeps SP
Bit .2 = 1 Operator keeps Dribble/preact
Bit .3 = 1 Operator keeps Tolerances
Bit .0 = 1 Program keeps Start/Stop
Bit .1 = 1 Program keeps SP
Bit .2 = 1 Program keeps Dribble/preact
Bit .3 = 1 Program keeps Tolerances
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201715
Weigh Scale Dosing (P_DoseWS)
Table 7 - P_DoseWS Input Parameters
Input ParameterData
OSet_SPREAL0.0Operator setting of total quantity to deliver (engineering units).
OSet_DribbleQtyOperator setting of quantity to dribble (engineering units).
OSet_PreactOperator setting of quantity before total to stop flow (engineering units).
OSet_TolHiOperator setting of high (excess) tolerance limit.
OSet_TolLoOperator setting of low (shortage) tolerance limit.
PCmd_TareBOOL0When Cfg_PCmdClear is 1:
PCmd_Star
PCmd_St
PCmd_CheckT
PCmd_BumpBOOL0When PCmd_Bump is set to 1:
PCmd_AcqBOOLMode.PCmd_Acq0When Cfg_PCmdClear is 1:
PCmd_RelMode
PCmd_LockBOOL
PCmd_UnlockMode
PCmd_ResetBOOL0• Set PCmd_Reset to 1 to reset all alarms requiring reset
PCmd_O
PCmd_Under
PCmd_Tar
PCmd_EqpFaultAckEqpFault.PCmd_Ack
tFlowBOOL0When Cfg_PCmdClear is 1:
opFlow
ol
verTolAckBOOLOverTol.PCmd_Ack0• Set PCmd_<Alarm>Ack to 1 to Acknowledge alarm
TolAckUnderTol.PCmd_Ack
eFaultAckTareFault.PCmd_Ack
Type
Alias ForDefaultDescription
• Set PCmd_Tare to 1 to reset the delivered quantity to 0
• This parameter is reset automatically
When Cfg_PCmdClear is set to 0:
• S
et PCmd_Tare to 1 to reset the delivered quantity to 0
• This parameter is not reset automatically
• Set PCmd_StartFlow to 1 to start delivery
• Set PCmd_StopFlow to 1 to stop delivery
• Set PCmd_CheckTolerances to 1 to check tolerances
• These parameters reset automatically
When
Cfg_PCmdClear is 0:
• S
et PCmd_StartFlow to 1 to start delivery
• Set PCmd_StopFlow to 1 to stop delivery
• Set PCmd_CheckTolerances to 1 to check tolerances
• These parameters do not reset automatically
• If the configured bump time (Cfg_BumpT) is nonzero, then bump delivery for
the configur
– PCmd_Bump is cleared automatically
• If the configured bump time (Cfg_BumpT) is zero, then bump delivery until
PCmd_Bump is returned to 0
– PCmd_Bump is not cleared automatically
• Cfg_PCmdClear does not affect this parameter
.PCmd_Rel
Mode.PCmd_Lock0When Cfg_PCmdClear is 1:
.PCmd_Unlock
• Set PCmd_Acq to 1 to Acquire
• Set PCmd_Rel to 1 to Release
• These parameters reset automatically
When
• Set PCmd_Acq to 1 to Acquire
• Set PCmd_Acq to 0 to Release
• PCmd_Rel is not used
• These parameters do not reset automatically
• Set PCmd_Lock to 1 to Lock
• Set PCmd_Unlock to 1 to Unlock
• These parameters reset automatically
When
• Set PCmd_Lock to 1 to Lock
• Set PCmd_Lock to 0 to Unlock
• PCmd_Unlock is not used
• These parameters do not reset automatically
• This parameter is always reset automatically
• The parameter is reset automatically
ed bump time
Cfg_PCmdClear is 0:
Cfg_PCmdClear is 0:
16Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Table 7 - P_DoseWS Input Parameters
Weigh Scale Dosing (P_DoseWS)
Input ParameterData
PCmd_OverTolSuppressBOOLOverTol.PCmd_Suppress0When Cfg_PCmdClear is 1:
OCmd_TareBOOL0Operator command to tare (reset delivered quantity to 0).
OCmd_StartFlowBOOL0Operator commands to start delivery, stop/pause delivery, or check tolerances.
OCmd_StopFlow
OCmd_CheckTol
OCmd_BumpBOOL0Operator command to bump delivery for under tolerance.
MCmd_AcqBOOLMode.MCmd_Acq0Maintenance command to acquire ownership (Operator/Program/Override to
MCmd_RelBOOLMode.MCmd_Rel0Maintenance command to release ownership (Maintenance to Operator/Program/
OCmd_AcqLockBOOLMode.OCmd_AcqLock0Operator command to acquire (Program to Operator)/lock ownership.
OCmd_UnlockBOOLMode.OCmd_UnlockRel0Operator command to unlock/release (Operator to Program) ownership.
OCmd_ResetBOOL0Operator command to reset all alarms requiring reset.
OCmd_ResetAckAllBOOL0Operator command to acknowledge and reset all alarms and latched shed
TolSuppressUnderTol.PCmd_Suppress
eFaultSuppressTareFault.PCmd_Suppress
TolUnshelveUnderTol.PCmd_Unshelve
eFaultUnshelveTareFault.PCmd_Unshelve
Type
Alias ForDefaultDescription
• Set PCmd_<Alarm>Suppress to 1 to suppress alarm
• Set PCmd_<Alarm>Unsuppress to 1 to unsuppress alarm
• These parameters reset automatically
When Cfg_PCmdClear is 0:
• Set PCmd_<Alarm>Suppress to 1 to suppress alarm
• Set PCmd_<Alarm>Suppress to 0 to unsuppress alarm
• PCmd_<Alarm>Unsuppress is not used
• These Parameters do not reset automatically
et PCmd_<Alarm>Unshelve to 1 to Unshelve alarm
• The parameter is reset automatically
Maintenance).
Override)
conditions.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201717
Weigh Scale Dosing (P_DoseWS)
Table 8 - P_DoseWS Output Parameters
Weigh Scale Dosing Output Structure
Output parameters include the following:
• Output data elements (Out_) are the primary outputs of the instruction,
typically used by hardware output modules; however, they can be used by
other application logic.
alue data elements (Val_) are numeric outputs of the instruction for
• V
use b
y the HMI. Values can also be used by other application logic or
are packages.
softw
ource and Quality data elements (SrcQ_) are outputs of the instruction
• S
use
d by the HMI to indicate PV source and quality.
tatus data elements (Sts_) are bit outputs of the instruction for use by the
• S
HM
I. Status bits can also be used by other application logic.
rror data elements (Err_) are outputs of the instruction that indicate a
• E
par
ticular configuration error. If any Err_ bit is set, then the Sts_Err
configuration error summary status is set and the Invalid Configuration
indicator is displayed on the HMI.
ot Ready data elements (Nrdy_) are bit outputs of the instruction for use
• N
by the HMI for displaying the Device Not Ready indicator. Not Ready bits
can also be used by other application logic.
larm data elements (Alm_) are outputs of the instruction that indicate a
• A
par
ticular alarm has occurred.
cknowledge data elements (Ack_) are outputs of the instruction that
• A
ind
icate the corresponding alarm has been acknowledged.
eady data elements (Rdy_) are bit outputs of the instruction used by
• R
the H
MI to enable or disable command buttons and setting entry
fields.
Output ParameterData TypeAlias ForDescription
EnableOutBOOLEnable output: The EnableOut signal is not manipulated by this instruction. Its output state
Out_RunFlowBOOL1 = Deliver at full (fast) flow.
Out_DribbleFlowBOOL1 = Deliver at dribble (slow) flow.
Out_StopFlowBOOL1 = Stop delivery equipment.
Val_PVREALWeight on scale (engineering units).
Val_TareREALWeight on scale when tare command received (engineering units).
Val_QtyREALQuantity actually delivered (change in weight) (engineering units).
Val_SPREALQuantity to be delivered (setpoint) (engineering units).
Val_RemainREALQuantity yet to deliver to reach setpoint (engineering units).
Val_PctCompleteREALPercent complete (for progress bar on HMI) 0.0…100.0%.
Val_DribbleQtyREALQuantity to be delivered at slow rate (engineering units).
Val_PreactREALQuantity before SP when flow is stopped (engineering units).
18Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
always reflects
EnableIn input state.
Weigh Scale Dosing (P_DoseWS)
Table 8 - P_DoseWS Output Parameters
Output ParameterData TypeAlias ForDescription
Val_TolHiREALAllowed quantity > or < SP (engineering units).
Val_TolLo
Val_PVEUMinREALMinimum of scaled range = MIN (Cfg_PVEUMin, Cfg_PVEUMax).
Val_PVEUMaxREALMaximum of scaled range = MAX (Cfg_PVEUMin, Cfg_PVEUMax).
SrcQ_IOSINTI/O signal source and quality.
SrcQFinal dose source and quality.
GOOD 0 = I/O live and confirmed good quality
1 = I/O live and assumed good quality
2 = No feedback configured, assumed good quality
TEST 8 = Device simulated
9 = Device loopback simulation
10 = Manually entered value
UNCERTAIN 16 = Live input, off-specification
17 = Value substituted at device/bus
18 = Value substituted by maintenance (Has and not Use)
19 = Shed, using last good value
20 = Shed, using replacement value
BAD 32 = Signal failure (out-of-range, NaN, invalid combination)
33 = I/O channel fault
34 = I/O module fault
35 = Bad I/O configuration (for example, scaling parameters)
Val_CmdSINTThis shows the command being processed, returns to zero once the command secedes or fails.
Val_FdbkSINTThis shows the input from the device:
Val_StsSINTThis is the primary status, used to show the operator the ‘confirmed’ device status:
Val_FaultSINTThis is the device fault status, used to show the operator the most severe device fault:
These values are also used for Inp_OvrdCmd:
0 = None
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201719
Weigh Scale Dosing (P_DoseWS)
Table 8 - P_DoseWS Output Parameters
Output ParameterData TypeAlias ForDescription
Val_ModeSINTMode.ValThe shows the current mode of the object:
0 = No mode
2 = Maintenance
4 = Program (locked)
5 = Operator (locked)
6 = Program (unlocked, Operator is default)
7 = Operator (unlocked, Program is default)
8 = Program (unlocked, Program is default)
9 = Operator (unlocked, Operator is default)
Val_OwnerDINTCurrent object owner ID (0 = not owned).
Val_NotifySINTCurrent alarm level and acknowledgement (enumeration):
0 = No alarm
1 = Alarm cleared: a reset or acknowledge is required
2 = Low (acknowledged)
3 = Low (unacknowledged)
4 = Medium (acknowledged)
5 = Medium (unacknowledged)
6 = High (acknowledged)
7 = High (unacknowledged)
8 = Urgent (acknowledged)
9 = Urgent (unacknowledged)
Sts_TaredBOOLScale tare completed, Quantity = 0.
Sts_FlowStartingBOOL1 = Flow is starting (Out_Run is on, feedback not showing run).
Sts_FlowRunningBOOL1 = Flow is running (Out_Run is on, feedback showing run).
Sts_DribbleStartingBOOL1 = Dribble starting (Out_Dribble is on, feedback not showing dribble).
Sts_FlowDribbleBOOL1 = Flow is slowed to dribble (Out_Dribble is on, feedback showing dribble).
Sts_FlowStoppingBOOL1 = Flow is stopping (Out_Stop is on, feedback not showing stopped).
Sts_FlowStoppedBOOL1 = Flow is Stopped (Out_Stop is on, feedback showing stopped).
Sts_BumpingBOOL1 = Bump flow is active.
Sts_CompleteBOOL1 = Total delivered > (SP - preact).
Sts_InTolBOOL1 = Total delivered is within tolerances.
Sts_AvailableBOOL1 = Dosing available for control by automation (program).
Sts_PVBadBOOL1 = Weight PV and rate PV quality bad (I/O fail).
0 = OK.
Sts_PVUncertainBOOL1 = Weight PV and rate PV quality are uncertain.
0 = OK.
Sts_NotRdyBOOL1 = Device is not ready to be operated.
Nrdy_CfgErrBOOL1 = Device Not Ready:
Nrdy_PVBad
Nrdy_EqpF
Nrdy_NoMode
Sts_MaintBypBOOL1 = A maintenance bypass is active, display icon.
Sts_AlmInhBOOL1 = One or more alarms shelved, disabled or suppressed.
Sts_ErrBOOL1 = Error: bad configuration, see detail err bits for reason.
Sts_OverTolDisabledBOOLOverTol.Disabled1 = Over/Under Tolerance, Tare Fault, or Equipment Fault alarm disabled by maintenance.
Sts_UnderTolDisabledUnderTol.Disabled
Sts_TareFaultDisabledTareFault.Disabled
Sts_EqpFaultDisabledEqpFault.Disabled
Sts_OverTolShelvedBOOLOverTol.Shelved1 = Over/Under Tolerance, Tare Fault, or Equipment Fault alarm shelved by operator.
Sts_UnderTolShelvedUnderTol.Shelved
Sts_TareFaultShelvedTareFault.Shelved
Sts_EqpFaultShelvedEqpFault.Shelved
Sts_OverTolSuppressedBOOLOverTol.Suppressed1 = Over/Under Tolerance, Tare Fault, or Equipment Fault alarm suppressed by program.
Sts_UnderTolSuppressedUnderTol.Suppressed
Sts_TareFaultSuppressedTareFault.Suppressed
Sts_EqpFaultSuppressedEqpFault.Suppressed
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201721
Weigh Scale Dosing (P_DoseWS)
Table 8 - P_DoseWS Output Parameters
Output ParameterData TypeAlias ForDescription
Rdy_TareBOOL1 = Ready for OCmd Tare, StartFlow, StopFlow, CheckTol, or Bump (enables HMI button).
Rdy_StartFlow
Rdy_StopFlow
Rdy_CheckTol
Rdy_Bump
Rdy_ResetBOOL1 = At least one alarm requires reset.
Rdy_ResetAckAllBOOL1 = At least one alarm or latched shed condition requires reset or acknowledgement.
Rdy_SPBOOL1 = Ready to receive OSet_SP.
Rdy_DribPreBOOL1 = Ready to receive OSet_DribbleQty or OSet_Preact.
Rdy_TolBOOL1 = Ready to receive OSet_TolHi or OSet_TolLo.
P_DoseWSBOOLUnique parameter name for auto-discovery.
22Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Weigh Scale Dosing Local Configuration Tags
Configuration parameters that are arrayed, string, or structure data types cannot
be configured as parameters for Add-On Instructions. Configuration parameters
of these types appear as local tags to the Add-On Instruction. Local tags can be
configured through the HMI faceplates or in Studio 5000 Logix Designer®
application by opening the instruction logic of the Add-On Instruction instance
and then opening the data monitor on a local tag. These parameters cannot be
modified by using controller logic or Logix Designer export/import
functionality.
Table 9 - P_DoseWS Local Configuration Tags
Tag NameData TypeDefaultDescription
Cfg_DescSTRING_40'Dosing with Weigh
Scale'
Cfg_LabelSTRING_20'Weigh Scale Dosing' Label for graphic symbol displayed on HMI. This string appears on the graphic symbol.
Cfg_QtyEUSTRING_8'kg'Engineering units for quantity for display on HMI.
Cfg_RateEUSTRING_8'kg/sec'Engineering units for rate (flow) for display on HMI.
Cfg_TagSTRING_20'P_DoseWS'Tagname for display on HMI. This string is shown in the title bar of the faceplate.
Description for display on HMI. This string is shown in the title bar of the faceplate.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201723
Weigh Scale Dosing (P_DoseWS)
Operations
This section describes the primary operations for Add-On Instructions.
Modes
This instruction uses the following standard modes, which are implemented by
using an embedded P_Mode Add-On Instruction.
Table 10 - Modes
ModeDescription
OperatorThe Operator owns control of the device. Operator commands (OCmd_) and Operator settings
(OSet_) from the HMI are accepted.
ProgramProgram logic owns control of the device. Program commands (PCmd_) and Program settings
(PSet_) are accepted.
MaintenanceMaintenance owns control of the device and supersedes Operator, Program, and Override
control. Operator commands and settings from the HMI are accepted. Bypassable interlocks and
permissives are bypassed, and device timeout checks are not processed.
No ModeThe device is disabled and has no owner because the EnableIn input is false. The main
instruction Logic routine is not being scanned. See Execution section for more information on
EnableInFalse processing.
IMPORTANT
Instructions with Cfg_OperKeep and Cfg_ProgKeep keep some aspects of the
device operation with the operator or program regardless of whether the main
mode is Program or Operator mode.
The following standard modes are not used:
• Hand mode
• Override (Ovrd) mode
See Rockwell Automation Library of Process Objects: Common Mode Block
(P_Mode) Reference Manual, publication
SYSLIB-RM005, for more
information.
24Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Alarms
This instruction uses the following alarms, which are implemented by using
embedded P_Alarm and P_Gate Add-On Instructions.
Alarm NameP_Alarm NameP_Gate NameDescription
Equipment FaultEqpFaultNoneRaised when the Inp_CtrldEqpFault input is true, or
Over toleranceOverTolNoneRaised when the tolerance check is performed and the
Tare FaultTareFaultNoneRaised if the scale is tared, then the weight changes
Under Tolerance
(Warning)
UnderTolNoneRaised when the tolerance check is performed and the
when equipment feedback signals fail to track the
commanded state of the equipment within the
configured time. If an equipment fault is configured
as a shed fault, the flow is stopped and a reset is
required to resume flow.
quantity delivered exceeds the setpoint by more than
the High Tolerance threshold.
from the tare weight by more than the configured tare
fault threshold (Cfg_TareFaultLim) before flow is
commanded to start.
quantity delivered falls short of the setpoint by more
than the Low Tolerance threshold.
TIP: In some instances, the Bump function can be
used to make up the shortage.
Parameters of the P_Alarm object can be accessed by using the following
convention: [P_Alarm Name].[P_Alarm Parameter].
See Rockwell Automation Library of Process Objects: Common Alarm Block
(P_Alarm) Reference Manual, publication
SYSLIB-RM002, for more
information.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201725
Weigh Scale Dosing (P_DoseWS)
Simulation
When the P_DoseWS block is placed in simulation, it continues to generate its
outputs to control equipment, but the vessel weight is ignored and a simulated
weight is generated.
This operation in simulation is different from the equipment (motor, valve,
drive) instructions.
WARNING: To avoid starting equipment during simulation, the downstream
equipment instructions must be put in simulation so that their outputs are held
in the SAFE state.
Failure to do this can result in personal injury or equipment damage.
Set the Inp_Sim parameter to ‘1’ to enable simulation.
The Simulation or Loopback Test icon is displayed at the bottom left of the
faceplate to indicate the device is in simulation.
While in simulation, you can use the following parameters to control how the
weight is simulated.
• Cfg_SimStartWt - when the Tare function is used, this value is copied to
the simulated scale weight. As delivery occurs, the simulated weight
increases (transfer in) or decreases (transfer out) from this point.
fg_SimRate - the full rate to be used for delivery (in weight units/rate
• C
ti
me).
fg_SimDribbleRate - the rate to be used for dribble (in weight units/rate
• C
ti
me).
When you have finished simulation, clear the Inp_Sim parameter to ‘0’ to return
to normal operation.
Execution
The following table explains the handling of instruction execution conditions.
ConditionDescription
EnableIn false (false rung)Any commands received are discarded. All alarms are
Powerup (pre-scan, first scan)Any commands received before first scan are discarded.
Postscan (SFC transition)No SFC postscan logic is provided.
cleared. The mode is reported as No Mode. The displayed
rate is zeroed. Outputs to controlled equipment are
de-energized. Other output parameters (values and
status) hold their last value.
Embedded P_Alarm instructions are handled in
accordance with their standard powerup procedures.
Refer to the reference manual for the P_Alarm instruction
for more information.
26Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
See the Logix5000 Controllers Add-On Instructions Programming Manual,
publication
1756-PM010, for more information.
Programming Example
The following P_DoseWS example shows a simple configuration of the block
with a two-speed motor (P_Motor2Spd).
The Input to P_DoseWS (Inp_WeightPV) is taken directly from a weight/force
indicating transmitter (WIT_2). The outputs of the block (Out_RunFlow and
Out_DribbleFlow) are connected to the inputs to the motor PCmd_RunFast
and PCmd_RunSlow, respectively. The motor status outputs stopped
(Sts_Stopped), running slow (Sts_RunningSlow), running fast
(Sts_RunningFast) are connected back to the P_DoseWS block as inputs
Inp_StopFdbk, Inp_RunFdbk, and Inp_DribbleFdbk.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201727
Weigh Scale Dosing (P_DoseWS)
Display Elements
A display element (global object) is created once and can be referenced multiple
times on multiple displays in an application. When changes are made to the
original (base) object, the instantiated copies (reference objects) are
automatically updated. Use of global objects, in conjunction with tag structures
in the ControlLogix system, aid consistency and save engineering time.
Table 11 - P_DoseWS Display Elements Description
Display Element Name Display ElementDescription
GO_DoseWSVertical orientation up.
GO_DoseWS1Horizontal orientation right.
GO_DoseWS2Horizontal orientation left.
Graphic objects are provided for use on end-user process graphic displays.
Common attributes of the P_DoseWS graphic symbols include the following:
• Graphical representation of the device
• Maintenance Bypass indicator
• Status/quality indicator
• Mode indicator
• Quantity and Scale Weight values
• Label
• State text
• Progress bar (percent complete)
• Quantity and Scale Weight Engineering Units
• Color changing alarm border that blinks on unacknowledged alarm
• Alarm indicator that changes color for the severity of the alarm
28Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Alarm Border
Alarm Indicator
Status/Quality
Indicator
Quantity Value
Current Scale Weight Value
Label
Scale
Symbol
Blue Progress
Bar (Percent
Complete)
State Indicator
Tex t
Maintenance Bypass
Indicator
Device Not Ready
Indicator
Mode Indicator
Delivered Quantity and Current Scale
Weight Engineering Units Text
The overall graphic symbol includes a touch field over it that opens the object’s
faceplate. In addition, pausing the pointing device over the graphic symbol
displays a tooltip showing the object’s configured tag and description.
Graphic Representation
The label changes color based on the highest severity alarm currently active.
ColorAlarm Severity
Light blueLow alarm
YellowMedium alarm
RedHigh alarm
MagentaUrgent alarm
GrayNo active alarms
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201729
Weigh Scale Dosing (P_DoseWS)
The color of the weigh scale symbol and its state text change depending on the
commanded state of the controlled equipment.
ColorEquipment State
Dark GrayNo flow (stopped)
WhiteRunning
BlueDribble
Light BlueBumping
Status/Quality Indicators
One of these symbols appears on the graphic symbol when the described
condition is true.
Graphic SymbolDescription
Invalid configuration.
Data quality bad/failure.
Data Quality degraded: uncertain, test, simulation, substitution, or out of specification.
The input or device has been disabled.
Device not ready to operate.
TIP
When the Invalid Configuration indicator appears, you can find what
configuration setting is invalid by following the indicators. Click the graphic
symbol to open the faceplate. The Invalid Configuration indicator appears next
to the appropriate tab at the top of the faceplate to guide you in finding the
configuration error. Once you navigate to the tab, the misconfigured item is
flagged with this indicator or appears in a magenta box.
For the Dosing with Weigh Scale Instruction, the Invalid Configuration
Indicator appears under the following conditions:
• Weight Input Raw Minimum and Raw Maximum scaling parameters are
set to the same value.
eight Scaled engineering units Minimum and engineering units
• W
Ma
ximum scaling parameters are set to the same value.
ate Filter Time Constant value is less than zero.
• R
• Rate Time value is less than or equal to zero.
• Maximum Allowed Quantity Setpoint value is less than or equal to zero.
• Scale Tare Fault Limit value is less than zero.
• Simulation Starting Weight, Simulation Flow Rate, or Simulation Dribble
te value is less than or equal to zero.
a
R
30Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
• Settle Time, Bump Time, Clear Pulse Time, or Equipment Fault Check
Time is set to a value less than zero or greater than 2,147,483 seconds.
larm Minimum On Time is set to a value less than zero or greater than
• A
2,147,483 seconds
larm Severity is set to a value less than 1 or greater than 1000.
• A
.
TIP
When the Not Ready indicator appears, you can find what condition is
preventing operation by following the indicators. Click the graphic symbol to
open the faceplate. The Not Ready indicator appears next to the appropriate
tab at the top of the faceplate to guide you in finding the condition. When you
navigate to the tab, the condition preventing operation is flagged.
Fo
r the Dosing with Weigh Scale instruction, the Device Not Ready indicator
ears under the following conditions:
app
here is a configuration error.
• T
• PV quality bad or communication error.
• External equipment fault and fault or shed requires reset.
Device logic is disabled or there is no mode.
Mode Indicators
One of these symbols appears on the right side of the graphic symbol to indicate
the mode of the object instruction.
Graphic SymbolDescription
TransparentOperator mode (if the default mode is Operator and the current mode is Operator, the mode
indicator is transparent).
Operator mode (if the default mode is Program).
Operator mode locked.
TransparentProgram mode (if the default mode is Program and the current mode is Program, the mode
indicator is transparent).
Program mode (if the default mode is Operator).
Program mode locked.
Maintenance mode.
No mode.
See Rockwell Automation Library of Process Objects: Common Mode Block
(P_Mode) Reference Manual, publication
SYSLIB-RM005, for more
information.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201731
Weigh Scale Dosing (P_DoseWS)
Alarm Indicators
One of these symbols appears on the left side of the label to indicate the described
alarm condition and the alarm border and label background change color. The
alarm border and label background blink if acknowledgement of an alarm
condition is required. Once the alarm is acknowledged, the alarm border and
label background remain the color that corresponds to the severity of the alarm.
SymbolBorder and Label BackgroundDescription
No change in colorAlarm Inhibit: an alarm is suppressed by the Program,
disabled by Maintenance, or shelved by the Operator.
WhiteReturn to normal (no alarm condition), but a previous
BlueLow severity alarm.
YellowMedium severity alarm.
RedHigh severity alarm.
MagentaUrgent severity alarm.
No symbolNo change in colorNo alarm or alarm inhibit condition, and all alarms
alarm has not been acknowledged.
are acknowledged.
See Rockwell Automation Library of Process Objects: Common Alarm Block
(P_Alarm) Reference Manual, publication
SYSLIB-RM002, for more
information.
Maintenance Bypass Indicator
This symbol appears to the right of the label to indicate that a maintenance
bypass has been activated.
TIP
When the Maintenance Bypass Indicator appears, you can find what condition
was bypassed by following the indicators. Click the Graphic Symbol to open the
Faceplate. The Maintenance Bypass Indicator appears next to the appropriate
tab at the top of the Faceplate to guide you in finding the bypass. Once you
navigate to the tab, the bypassed item is flagged with this indicator.
For the P_DoseWS Instruction, the Maintenance Bypass Indicator appears when
the instruction is configured by engineering to have equipment feedback, but
maintenance personnel have selected to not use the equipment feedback.
32Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Use Global Objects
The graphic symbol for P_DoseWS can be found in the global object file
(RA-BAS) Process Graphics Library.ggfx.
1. Copy the global object from the global object file and paste it in the
display file.
2. In the display, right-click the global object and choose Global Object
Para
meter Values.
The Global Object Parameter Values dialog box appears.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201733
Weigh Scale Dosing (P_DoseWS)
The global object parameters are as follows.
ParameterRequiredDescription
#102YObject tag to point to the name of the associated object Add-On
#103YPath used for display navigation features to other objects. Include
#120NAdditional parameter to pass to the display command to open the
#121NAdditional parameter to pass to the display command to open the
#122YThese are the options for the global object display:
Instruction in the controller.
program scope if tag is a program scope tag.
faceplate. Typically used to define position for the faceplate.
faceplate. If defining X and Y coordinate, separate parameters so
that X is defined by #120 and Y is defined by #121. This lets the
same parameters to be used in subsequent display commands
originating from the faceplate.
0 = Always show faceplate
1 = Show Quick Display for users without Maintenance access
(Code C)
2 = Always show Quick Display
3. Type the tag or value in the Value column as specified in the Description
colu
mn.
4. C
TIP
lick OK.
Click the ellipsis (. . .) to browse and choose a tag.
Values for items marked ‘(optional)’ can be left blank.
34Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Quick Display
The Quick Display screen provides the means for operators to perform simple
interactions with the P_DoseWS instruction instance. From the Quick Display,
you can navigate to the faceplate for full access for operation, maintenance, and
configuration.
Navigate to Full
Faceplate Button
Faceplate
The weigh scale dosing faceplate consists of six tabs and each tab consists of one
or more pages.
The title bar of each faceplate contains the value of local configuration tags
Cfg_Tag and Cfg_Desc.
The Operator tab is displayed when the faceplate is initially opened. Click the
appropriate icon at the top of the faceplate to access a specific tab.
Maintenance
OperatorEngineering
DiagnosticsAlarms
Trends
Help
Exit
The faceplate provides the means for operators, maintenance personnel,
engineers, and others to interact with the P_DoseWS instruction instance,
including viewing its status and values and manipulating it through its commands
and settings. When a given input is restricted via FactoryTalk View security, the
required user-security code letter is shown in the tables that follow.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201735
Weigh Scale Dosing (P_DoseWS)
Operator Tab
The Faceplate initially opens to the Operator (‘Home’) tab. From here, an
operator can monitor the device status and manually operate the device when it is
in Operator mode.
The Operator tab shows the following information:
• Current mode (Operator, Program, or Maintenance)
• Requested modes indicator (appears only if the Operator or Program
mode h
section for more information.)
• D
or Com
• Qu
• Quantity delivered display
• Delivery rate display
• Tolerance check result indicator (in tolerance, over tolerance, or under
t
• Eq
dribble, or bu
• Qu
• Input Source and Quality indicator (See 'SrcQ' in the Output parameters
ta
as been superseded by another mode; see the Maintenance tab
elivery progress bar if delivering, or the delivery status (Tared, Complete,
plete at Zero)
antity remaining to deliver display
olerance; this appears after performing a tolerance check)
uipment commanded state indicator, for example, stopped, running,
mping
antity setpoint data entry field
page 19 for details).
ble on
TIP
The Tolerance Indicator shows if the delivery was in tolerance, under tolerance,
or over tolerance. This indicator is visible only when a tolerance check has been
requested after delivery is complete.
If a delivery is under tolerance (short) and the bump function is enabled, the
operator can bump the equipment to try to make up the shortfall and bring
the delivery into tolerance
36Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Mode Indicator
Weigh Scale Dosing (P_DoseWS)
Reset Acknowledge All Alarms
Command Buttons
Delivery Progress Bar
Tolerance Indicator
Scale Weight
Dosing Equipment
Commanded State
Indicator
Input Source and
Quality Indicator
Input Source and
Quality Icon
Operator Mode Unlock and Lock
Command Buttons
Tare Scale Command Button
Start Flow Command Button
Check Tolerance Command
Button
Bump Flow Command Button
Stop Flow Command Button
The following table shows the functions on the Operator tab.
Table 12 - Operator Tab Description
Button/FieldActionSecurity
Click to release Operator mode Lock.Manual device
Click to lock in Operator mode.
Click to request Program mode.
Click to request Operator mode.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201737
operation (code B)
Weigh Scale Dosing (P_DoseWS)
Table 12 - Operator Tab Description
Button/FieldActionSecurity
Click to reset and acknowledge all alarms.Acknowledge alarms
(code F)
Click to tare the scale. This sets the delivered
quantity to zero.
Click to start or resume delivery.
Click to stop (pause) delivery.
Click to perform a tolerance check on the
delivered quantity.
Click to bump flow. This function is used to
top off a delivery that has passed the preact
point but is still short of the setpoint quantity.
Setpoint quantityConfigure the quantity to deliver.
Normal operation of
devices (code A)
Alarm indicators appear on the Operator tab when the corresponding
alarm occurs.
38Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Tare Fault Alarm
Over Tolerance Alarm
Under Tolerance Alarm
Equipment Fault Alarm
Weigh Scale Dosing (P_DoseWS)
Alarm status indicators appear next to values or status indicators that are in
alarm. The following table shows the meaning of alarm status indicators on the
Operator tab.
Table 13 - Alarm Status Indicators
Graphic ObjectAlarm Status
In alarm (active alarm)
In alarm and acknowledged
Out of alarm but not acknowledged
Alarm suppressed (by program)
Alarm disabled (by maintenance)
Alarm shelved (by operator)
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201739
Weigh Scale Dosing (P_DoseWS)
Maintenance Tab
Maintenance personnel use the information and controls on the Maintenance tab
to make adjustments to device parameters, troubleshoot and temporarily work
around device problems, and disable the device for routine maintenance.
The Maintenance is divided into two pages.
Maintenance Tab Page 1
Page one of the Maintenance tab shows the following information:
• Current mode (Operator, Program, or Maintenance)
• Requested modes indicator highlights all of the modes that have been
eq
uested, and the left-most highlighted mode is the active mode
r
urrent high tolerance value
• C
• Current low tolerance value
• Dribble quantity data entry field
• Preact quantity data entry field
Mode Indicator
Requested Modes Indicator
Input Signal from
Weigh Scale
Maintenance Mode Acquire
and Release Command
Buttons
40Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
The following table shows the functions on page one of the Maintenance tab.
Click to open an upstream channel
object faceplate (for example,
P_AIChan).
IMPORTANT: 'Enable navigation to
Weight input object' on page 2 of the
Engineering tab must be enabled for
this field to be displayed.
Engineering Tab Page 2 on
(See
page 47.)
Configure the quantity in pounds left
to deliver before switching to a
reduced flow rate (dribble) for finer
control of the final quantity.
Configure the quantity before
reaching the setpoint before
commanding the delivery equipment
to stop and let the equipment react.
This helps to prevent overshooting
the delivery setpoint.
Type the high tolerance threshold.
When a tolerance check is initiated, if
the delivered quantity exceeds the
setpoint amount by more than this
amount, the delivery is over
tolerance; the over tolerance alarm is
raised if enabled.
Type the low tolerance threshold.
When a tolerance check is initiated, if
the delivered quantity falls short of
the setpoint amount by more than
this amount, the delivery is under
tolerance; the under tolerance alarm
is raised if enabled.
For the Low tolerance condition, the
operator can command a bump flow
to try to bring the quantity delivered
into tolerance.
Normal
operation of
Devices
(code A)
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201741
Check to use the available feedback
from the delivery equipment and
take the device out of Maintenance
Bypass.
Clear this checkbox to not use
feedback from the delivery
equipment and place the device in
Maintenance Feedback.
IMPORTANT: 'Delivery Equipment
has Feedback' on page 2 of the
Engineering tab must be enabled for
this field to be visible.
(See
Engineering Tab Page 2 on
page 47.)
Check to enable or disable bumpless
program/operator transition of
quantity setpoint, dribble quantity,
preact and tolerance Threshold
settings (tracking).
Equipment
maintenance
(code C)
Cfg_UseEqpFdbk
Cfg_SetTrack
42Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Maintenance Tab Page 2
Weigh Scale Dosing (P_DoseWS)
The following table lists the functions of page two of the Maintenance tab.
Percentage of
delivery error to
auto-adjust preact
(%)
Amount (Pounds)
scale can drift after
Tare before starting
flow without
faulting
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201743
Type the percentage of delivery error.
When the delivery tolerance is
checked, if no bump has occurred and
if the delivery is in tolerance, the
error (difference between delivery
setpoint and actual delivery) is
multiplied by this percentage and
applied to the preact. This lets the
preact self-tune and learn the correct
value of the preact over time.
Type the tare fault threshold. After
the scale is tared and before flow is
commanded, if the weight reported
by the scale drifts from the tare
weight by more than this amount, a
tare fault alarm is raised.
Time after output
for equipment
feedback before
Fault (seconds)
Delay after flow
stop before
enabling tolerance
check (seconds)
Type the amount of time to
command the controlled equipment
to run flow when the bump
command button is pressed. If this
value is set to zero, Bump is treated
like a Jog: flow starts when the
button is pressed and stops when the
button is released. If this value is
greater than zero, flow is bumped for
the configured time.
Type the maximum allowed feedback
time.
If equipment feedback is being used,
the instruction allows this much time
after commanding the equipment for
feedback to show the equipment in
the commanded state before raising
a fault status.
Type the amount of time in seconds
after flow is stopped for the scale
reading to settle before a tolerance
check can be commanded.
Configuration
& tuning
maintenance
(Code D)
Cfg_BumpT
Cfg_Fault
Cfg_SettleT
44Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Engineering Tab
The Engineering tab provides access to device configuration parameters and
ranges, options for device and I/O setup, displayed text, and
faceplate-to-faceplate navigation settings, for initial system commissioning, or
later system changes.
The Engineering tab is divided into three pages.
Engineering Tab Page 1
On page 1 of the Engineering tab, you can configure the description, label, tag,
weigh scale input scaling and units, and rate units for the device.
Page Control Navigation
Mode Configuration Button
Device Description,
Label, and Tag
Rate Units
Scaling And Units for
Weigh Scale Input
Units
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201745
Weigh Scale Dosing (P_DoseWS)
The following table lists the functions on page 1 of the Engineering tab.
Table 16 - Engineering Tab Page 1 Description
FunctionActionSecurityConfiguration
Click to navigate to the Configuration Mode
display.
DescriptionType the device description to be used on the
LabelType the device label to be used on the graphic
TagType the tagname to be used on the title bar of
Rate unitsType the engineering units text for the rate of
Input Weight PV
Scaling: Raw
maximum and
minimum input
Input Weight PV
Scaling: Scaled
maximum and
minimum input
UnitsType the engineering units text for the weight
Auto adjust preact
after each delivery
Running reduces
weight (transfer
out)
faceplate title bar.
symbol.
the operator faceplate and in the Tooltip.
delivery.
Type the minimum and maximum values for
the raw Input from the weigh scale. These
values are used for scaling from raw to
engineering units.
Type the minimum and maximum values for
the scaled input from the weigh scale in
engineering Units. These values are used for
scaling from raw to engineering units.
from the scale.
Check to automatically adjust the preact based
on the actual vs. setpoint quantity after each
successful delivery.
Clear this checkbox to leave the preact as
entered.
Check if the weight on the scale decreases as
delivery proceeds (material is transferred out of
the vessel being weighed).
Clear this checkbox if the weight on the scale
increases as delivery proceeds (material is
transferred into the vessel being weighed).
Engineering
configuration
(code E)
Parameters
See Mode Configuration
display on
Cfg_Desc
Cfg_Label
Cfg_Tag
Cfg_RateEU
• Cfg_InpRawMin
• Cfg_InpRawMax
• Cfg_PVEUMin
• Cfg_PVEUMax
Cfg_QtyEU
Cfg_AutoAdjPreact
Cfg_LossInWeight
page 46
Mode Configuration Display
46Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
This display lets you select the default mode for the object by selecting the
appropriate mode.
IMPORTANT
If no mode is being requested, changing the default mode changes the mode
of the instruction.
You must have FactoryTalk View security code E to select the default mode on
this display.
Engineering Tab Page 2
The following table lists the functions on page 2 of the Engineering tab.
Table 17 - Engineering Tab Page 2 Description
FunctionActionSecurityConfiguration Parameters
Slow to dribble
before complete
Clear program
commands on
receipt
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201747
Check to have the equipment
commanded to a slower dribble rate
as delivery nears completion to
improve the accuracy of quantity
delivered.
Check to clear program commands on
receipt.
Engineering
configuration
(code E)
Cfg_HasDribble
Cfg_PCmdClear
Weigh Scale Dosing (P_DoseWS)
Table 17 - Engineering Tab Page 2 Description
FunctionActionSecurityConfiguration Parameters
Delivery Equipment
has Feedback
Stop Delivery on
Equipment Fault
Enable navigation
to Weight Input
object
Maximum allowed
quantity to deliver
(setpoint)
Filter time constant
for calculated rate
(seconds)
Time factor for rate
(e.g., 60 for /min or
3600 for /hr)
(seconds)
Check, if the controlled equipment
provides feedback of its running,
dribbling, and stopped status to this
instruction. This instruction checks
that the equipment is performing the
commanded function and provides a
status (and optional alarm) if the
equipment fails to respond as
commanded within a configurable
time.
TIP: The feedback fault time is
configured on the Maintenance tab,
page 2.
When checked, 'Use Equipment
Feedback' on page 1 of the
Maintenance tab is available.
(See
Maintenance Tab Page 1 on
page 40.)
Clear this checkbox if the controlled
equipment does not provide
feedback of its status. The instruction
assumes the equipment is
performing the commanded function
and no equipment failure-to-respond
checking occurs.
Check if you want the dosing
instruction to attempt to stop the
controlled equipment if an
equipment fault is reported
(Inp_CtrldEqupFault) or detected (via
feedbacks).
Clear this checkbox if you want the
dosing instruction to keep
performing its current function, even
if an equipment fault occurs.
Check to enable navigation to the
Raw Weight’s Input channel object
faceplate.
IMPORTANT: The name of the
Channel object in the controller must
be this object's name with the suffix
‘_Chan’. For example, if your
P_DoseWS object has the name
‘DoseWS123’, then its Channel object
must be named ‘DoseWS123_Chan’.
Enter the maximum allowed quantity
to deliver. The quantity setpoint is
clamped to not exceed this value.
Enter the filter time constant for
calculated rate.
Enter the time factor for rate. If the
rate is in units per second, enter 1.0; if
the rate is in units per minute, enter
60.0; and so on.
Engineering
configuration
(code E)
Cfg_HasEqpFdbk
Cfg_ShedOnEqpfault
Cfg_HasChanObj
Cfg_MaxQty
Cfg_RateFiltTC
Cfg_RateTime
48Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Engineering Tab Page 3
Weigh Scale Dosing (P_DoseWS)
The following table lists the functions on page 3 of the Engineering tab.
Table 18 - Engineering Tab Page 3 Description
FunctionActionSecurityConfiguration Parameters
Operator keeps
control in program
mode: Start & stop
commands
Program keeps
control in operator
mode: Start & stop
commands
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201749
Check to keep control of dosing
commands, such as tare and start
flow, with the operator, even if the
instruction is in Program mode.
Clear this checkbox to have control of
dosing commands follow the
Instruction mode.
Check to keep control of dosing
commands, such as tare and start
flow, with the program, even if the
instruction is in Operator mode.
Clear this checkbox to have control of
dosing commands follow the
Instruction mode.
Engineering
configuration
(code E)
Cfg_OperKeep.0
Cfg_ProgKeep.0
Weigh Scale Dosing (P_DoseWS)
Table 18 - Engineering Tab Page 3 Description
FunctionActionSecurityConfiguration Parameters
Operator keeps
control in Program
mode: Setpoint
Program keeps
control in Operator
mode: Setpoint
Operator keeps
control in Program
mode: Dribble and
preact settings
Program keeps
control in Operator
mode: Dribble and
preact settings
Operator keeps
control in Program
mode: High/low
tolerances
Program keeps
control in Operator
mode: High/low
tolerances
Delivery rate in
Loopback Test
(Rate units)
Dribble rate in
Loopback Test
(Rate units)
Tare Weight in
Loopback Test
(Rate units)
Check to keep control of the setpoint
quantity setting with the operator,
even if the instruction is in Program
mode.
Clear this checkbox to have control of
the setpoint quantity setting follow
the Instruction mode.
Check to keep control of the setpoint
quantity setting with the program,
even if the instruction is in Operator
mode.
Clear this checkbox to have control of
the setpoint quantity setting follow
the Instruction mode.
Check to keep control of the dribble
and preact quantity settings with the
operator, even if the instruction is in
Program mode.
Clear this checkbox to have control of
the dribble and preact quantity
settings follow the Instruction mode.
Check to keep control of the dribble
and preact quantity settings with the
program, even if the instruction is in
Operator mode.
Clear this checkbox to have control of
the dribble and preact quantity
settings follow the Instruction mode.
Check to keep control of the high and
low tolerance settings with the
operator, even if the instruction is in
Program mode.
Clear this checkbox to have control of
the high and low tolerance settings
follow the Instruction mode.
Check to keep control of the high and
low tolerance settings with the
program, even if the instruction is in
Operator mode.
Clear this checkbox to have control of
the high and low tolerance settings
follow the Instruction mode.
Enter the normal running delivery
rate that is used when the P_DoseWS
instruction is in simulation
(Inp_Sim = 1).
Enter the dribble (slow) delivery rate
that is used when the P_DoseWS
instruction is in simulation
(Inp_Sim = 1).
Enter the weight that appears on the
scale after a tare when the
P_DoseWS instruction is in
simulation (Inp_Sim = 1).
Engineering
configuration
(code E)
Cfg_OperKeep.1
Cfg_ProgKeep.1
Cfg_OperKeep.2
Cfg_ProgKeep.2
Cfg_OperKeep.3
Cfg_ProgKeep.3
Cfg_SimRate
Cfg_SimDribbleRate
Cfg_SimStartWt
50Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Diagnostics Tab
The Diagnostic tab provides indications that are helpful in diagnosing or
preventing device problems, which can include specific reasons a device is 'Not
Ready', device warnings and faults, warning and fault history, and predictive/
preventive maintenance data.
The Diagnostics tab displays possible reasons the device is not ready.
The previous image indicates that the PV has bad quality or there is a
communication failure.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201751
Weigh Scale Dosing (P_DoseWS)
Trends Tab
The Trends Tab shows trend charts of key device data over time. These faceplate
trends provide a quick view of current device performance to supplement, but not
replace, dedicated historical, or live trend displays.
The Trends tab is divided into 2 pages.
Trends Tab Page 1
(Green) Delivery Rate
52Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
(Green) Delivery Quantity
Weigh Scale Dosing (P_DoseWS)
Trends Tab Page 2
(Blue) Setpoint
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201753
Weigh Scale Dosing (P_DoseWS)
Device Not
Ready Indicator
Alarm Names
Alarms Tab
The Alarms Tab shows all the available alarms for the device and their current
status. From here, Alarms can be acknowledged and reset. Click an alarm name to
open the alarm detail faceplate for that alarm where the alarm can be shelved by
the operator, disabled by maintenance, or configured by engineering.
Alarm
Severity
Indicators
Acknowledge Alarm
Command Button
Reset and Acknowledge
All Alarms Command
Button
Click an alarm name to open the P_Alarm faceplate for that alarm. From the
P_Alarm faceplate, you can configure and perform additional operations on
the alarm.
If an alarm is active, the panel behind the alarm changes color to match the
severity of the alarm. The color of the bell icon at the top of the faceplate shows
the severity of the highest active alarm, and the icon blinks if any alarm is
unacknowledged or requires reset.
Table 19 - Alarm Severity Colors
ColorDefinition
MagentaUrgent
RedHigh
YellowMedium
54Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Weigh Scale Dosing (P_DoseWS)
Table 19 - Alarm Severity Colors
ColorDefinition
BlueLow
White (bell icon)Alarm has cleared but is unacknowledged
Background (Light Gray)No alarm
The following table shows the functions on the Alarms tab.
Table 20 - Alarms Tab Description
FunctionActionSecurity
Alarm NameClick an alarm name to open the associated
P_Alarm faceplate.
Click to acknowledge the alarm.Acknowledge Alarms
Click to reset and acknowledge all alarms.
None
(Code F)
When the Reset and Acknowledge All Alarms button is enabled, the panel
behind the alarm blinks, indicating the alarm requires acknowledgement or reset.
The Alarm Acknowledge button is enabled if the alarm requires
acknowledgment. Click the button with the check mark to acknowledge the
alarm.
See Rockwell Automation Library of Process Objects: Common Alarm Block
(P_Alarm) Reference Manual, publication
SYSLIB-RM002, for
more information.
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201755
Weigh Scale Dosing (P_DoseWS)
Weigh Scale Dosing Drive Faceplate Help
The Faceplate Help is divided into two pages.
Faceplate Help Page 1
56Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
Faceplate Help Page 2
Weigh Scale Dosing (P_DoseWS)
Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 201757
Weigh Scale Dosing (P_DoseWS)
Notes:
58Rockwell Automation Publication SYSLIB-RM021G-EN-E - February 2017
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