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Predictive Valve Diagnostics using Hart protocolDavide Brambilla GE O&G DTS FPT
Masoneilan Digital Prod. Europe
Title
TEXT
� First Bullet (use “indent” function for inserting bullets)
2
AgendaAgenda
GE © 2016. All rights reserved
COMMUNICATIONS PROTOCOLS Refresh: HART
What is HART?
HART IS AN HYBRID MASTER/SLAVE COMMUNICATION PROTOCOL.
�HIGHWAY ADDRESSABLE REMOTE TRANSDUCER
�BASED ON BELL 202 FREQUENCY SHIFT KEY
�SUPERIMPOSED DIGITAL COMMUNICATION ON 4-20MA ANALOG SIGNAL
Signal 4-20mA
+0.5mA
-0.5mA
1200Hz
1
2200 Hz
0
GE © 2016. All rights reserved
COMMUNICATIONS PROTOCOLS Refresh: HART
What is HART?
HART i/O TT
Master/Slave
�Master (HART Modem) requests information from Slave (field device)
�FSK signal doesn’t disturb 4-20mA analog signal�Digital signal is based on 0 and 1
GE © 2016. All rights reserved
COMMUNICATIONS PROTOCOLS Refresh: HART
What is HART?
2 Masters (Primary and Secondary)
�Up to two masters in the same channel�No disruption�Allows handheld terminals for maintenance
GE © 2016. All rights reserved
COMMUNICATIONS PROTOCOLS Refresh: HART
What is HART?
Point to Point, Multidrop, Burst Mode.
�Point to Point for process control�Multidrop mainly for monitoring�Burst mode for continuous PV transmission
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HART is based on OSI model (7 Layers protocol)
Current HART Version is 5/6/7 (Includes WirelessHART)
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HART Commands are divided in 4 major groups
HART RefreshHART Specifications-Commands
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HART 5 or 6 or 7
Hart 5:is the 99% of installed base
Hart 6:is mainly for system intergation
Hart 7:is mainly for the wireless intergation
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Long TAG: Increase tag lenght form 8 to 32 characters
Locate Device: Flashes a messagge on device’s dysplay «0-0-0-0»
Digital Loop Check: Sets the analog and digital output. Used to check that even Hart
output valuse are outputting corretly and device is configuring
HART Software Lock: Prevents cofiguration changes by unautorized personell
Multi Variable Statuses Provides output quality information for all variables
HART 6 and 7
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Wireless: Command for enable Wirless communication
Expand manufacutrer ID: Allows new manufacturers to register devices( the
number of manufactureres increase beyond initial estimantion)
Enhanced Multi- Variable Communication (8): Increase device output capability
from 4 variables to 8.
Time Stamp: Devices must have an internal clock. This allows a user to configure
the time between measurements for wireless devices
Trends: A device can store till 12 measurment points. Tracking the trends in the
device is benefical for wirless devices used in moniotr applications.
Syncronized Sampling: A wirless feture that enable multiple devices to measure at
a specific, syncornized time.
HART 7
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Deployment for Standalone HART
HARTModem
ControlSystem
AnalogOut
1010 0101
Command signal, position, actuator pressure, etc
Safe Area Field
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Safe Area Field
SPECIALIZED
SOFTWARE
ASSETMANAGEME
NT
PDH
Command signal, position, actuator pressure, etc
Command signal, position, actuator pressure, etc
1010 0101 0011 1001 1110 1100
DCS
HART Trasparent
And/or FF
Deployment for Integrated Solution
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Legacy ControlSystem
AnalogOut
Command signal, position, actuator pressure, etc
1010 0
101
Safe Area Field
MUX
Deployment for Standalone HART Multiplexor
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LegacyControlSystem
withoutHART
nor FF IO
PDH
Field
VA Deployment…Standalone HART Wireless
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Go wireless
• Improve visibility to critical assets to help you maintain overall health of assets– Device status
– Diagnostics
– Configuration
• Reduced overall maintenance and expedited repair cost
• Cost effective alternative for retrofitting wired instrumentation
• Wireless is a bridge for non-HART DCS systems
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Installation requirements
• Gateway device
• Use PC standards (e.g. OPC) to connect data to enterprise systems … PAM, CBM, etc.
• Add wireless adapters to existing 4-20mA-only smart devices (e.g. HART)
Existing HARTDevices
Wireless Adapters
Analog Only I/O Legacy DCS
OPC & Host Applications
Specialized
software Valve
Monitor
PV Data
Valve position,transmitter variables
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NC Black Dir PWR
Red loop PWR
White RET
Yellow HART
Green GND
Loop
Power
supply
Ve
ctor
GND
(-)(+)
Field wiring( power from 4-20mA signal)
Loop powered
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Continuous and off-line diagnostics
Continuous Diagnostics: collects information while the device is in operation and alerts the host or user for further analysis if deviation found.
Off-line Diagnostics: analyzes the valve condition through a set of tests executed while the valve is not in operation. Usually requires valve movement.
Continuous Diagnostics: collects information while the device is in operation and alerts the host or user for further analysis if deviation found.
Examples:
• Travel Deviation
• Pressure too low
• Temperature too high, etc.
Examples:
• Ramp test
• Valve Signature
• Step test, etc.
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Advanced Valve diagnosticsValve signature enables predictive maintenance
•Friction•Bench Range•Response Open
•Response Closed•Actuator Pressure•Seating Analysis
•T86•Hysteresis•Dead band
•Overshoot•Resolution•Dead Time
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Friction signatures off line : Good diagnostic butCustomers claim: What if I can’t run valve offline?
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Solution:Friction on line
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GE © 2016. All rights reserved
Valve diagnostics• Condition monitoring of control valve without disturbing the operations
• Efficient maintenance management of control valve equipment
• Improve safety by avoiding unsafe situations that could result from malfunctions
• Increase process yields RemoteMonitoring
Planning
OnsiteSupport
Data
ConditionMonitoring
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Summary
• Thousand of Smart HART Device are nowadays de-facto ready to provide “Free” information.
• Very often a lot of free information are not readen
• New HART allow Unleashing the power of valve diagnostics
• Flexible solutions can be find solution for your critical assets
Thank you.Questions: [email protected]
GE © 2016. All rights reserved
Copyright
Copyright © 2015 FieldComm Group™
This document contains copyrighted material and may not be reproduced in any fashion without the written permission of the
FieldComm Group™.
TRADEMARK INFORMATION
FieldComm Group™, FOUNDATION™ Fieldbus, HART-IP™ and FDI™ are trademarks, and HART®, WirelessHART®, ROM® and SIF®
are registered trademarks of FieldComm Group, Austin, Texas, USA.
Any use of these terms hereafter in this document, or in any document referenced by this document, implies the trademark/registered trademark. All other trademarks used in this or referenced documents are trademarks of their respective companies. For more information, contact FieldComm Group at the address below.
Attention: FieldComm Group PresidentFieldComm Group
9430 Research Blvd., Ste. 1-120Austin, TX 78759, USA Voice: (512) 792-2300 Fax: (512) 792-2310http://www.fieldcommgroup.org
INTELLECTUAL PROPERTY RIGHTS
The FieldComm Group (the Group) does not knowingly use or incorporate any information or data into the HART, FOUNDATION
Fieldbus and FDI protocol standards, which the Group does not own or have lawful rights to use. Should the Group receive any notification regarding the existence of any conflicting private IPR, the Group will review the disclosure and either (A) determine there is
no conflict; (B) resolve the conflict with the IPR owner; or (C) modify the standard to remove the conflicting requirement. In no case does the Group encourage implementers to infringe on any individual's or organization's IPR.
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