Single Control Loops with Control in the FieldSingle Control Loops with Control in the Field

FFIC C fFFIC ConferenceControl in Field

15th December, 2010I d t i l A t ti I di 2010Industrial Automation India 2010NSE Complex, GoregaonMumbai (India)Mumbai (India)

SamsonSamson

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Product overviewP V lProcess Valves

Control Valves

Positioner and Accessories

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Technology – Function block model

Resource Block

Technology Function block model

Resource Block Contains all characteristic data of the deviceE.g. manufacturer, software revision,… AO

Analog Output

PIDController

Transducer BlockBuilding up the connection to the hardware (sensor/actor → I/O function blocks)

Output ControllerMAI

MultipleAnalog Input

Function BlocksDescribe the function of a device

DO 1/2Digital Output

Interface to the fieldbusManufacturer decide which types of FB are implementedThe key for Control in the Field

DI 1/2Digital Input

MAOMultipleAnalog

ISInput

Selector

The key for Control in the Field Output

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Technology – Function block modelTechnology Function block model

MLManual Loader

AO

AIAnalog Input

PID

AIAnalog Input

PID

AIAnalog Input

PID

DIDiscrete Input

MAIMultiple

AI

InputAO

Analog Output

PIDControl

AOA l

PIDControl

AOA l

PIDControl

DODiscrete Output

AOAnalog Output

Cascade Control

Analog Output

Analog Output

PID Control Manual Control

Output

For example the FBs of SAMSON type 3730-5 positioner can be used for:

AO to travel a control valveDO to close/open an on/off valve or to start a Partial Stroke TestDI to read the discrete valve position or the condensed state (NE107)MAI to read the actual valve position or time for next auto started PST

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MAI to read the actual valve position or time for next auto-started PST

Technology - Link Active Scheduler (LAS)

The LAS is managing the devices and their

Technology Link Active Scheduler (LAS)

The LAS is managing the devices and theircommunication on the bus → Network administrator

Manages the “Li e List” of all attached de ices bManages the “Live List” of all attached devices by recognition of new devices and devices that have been removed or that are not longer communicating

Generates and manages the “Schedule” for the fixed and deterministic exchange of process data

Allocation of send rights (tokens) to devices for unscheduled data exchange

Time synchronization of field devices

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Technology – LAS Redundancyec o ogy S edu da cy

HSE (Hi h S d E h

Link Master devices (with LAS function)

Basic devices (without LAS Function)

HSE (High Speed Ethernet with up to 12 MBit/s) Several Link Master devices available in one

segment, only one can become the LAS

PLC /Link Master LAS

H1 Fieldbus (IEC 61158-2 with 31,25 kBit/s)T

Power Supply /Power Conditionerwith termination

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Basic DeviceBackup Link Master (LAS) Basic Device

Technology – LAS RedundancyTechnology LAS Redundancy

HSE (Hi h S d E h

Event of failure of the primary LAS

Backup LAS will take over HSE (High Speed Ethernet

with up to 12 MBit/s) Network traffic will resume uninterrupted

→ Increased reliability and availabilityPLC /

Link Master LAS

H1 Fieldbus (IEC 61158-2 with 31,25 kBit/s)T

Power Supply /Power Conditionerwith termination

Failure / lost communication

to controller

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Basic DevicesBackup Link Master (LAS)

Single loop control in DCS & in the field

Control in the field

Single loop control in DCS & in the field

Control in the field

Loop Control in DCS

Loop Control in pressure transmitter

Loop Control in positioner

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Single loop control in DCS & in the fieldS g e oop co t o CS & t e e d

Loop control in DCSLoop control in DCS

1. AO and AI are executedstart unscheduled communication

2. PID is communicating OUT to AO(values calculated in upstream cycle)

3. AI is communicating OUT to PID4 AO is communicating BKCAL OUT to PID4. AO is communicating BKCAL_OUT to PID5. Controller is executing PID

→ AO is moving into committed position in next cycle

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Single loop control in DCS & in the field

Loop control in e g pressure transmitter

S g e oop co t o CS & t e e d

Loop control in e.g. pressure transmitter

1. AI are executedStart unscheduled communication

2. PID is executed3. PID is communicating OUT to AO4. AO is executed and moving valve into committed position5 AO is communicating BKCAL OUT to PID5. AO is communicating BKCAL_OUT to PID

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Single loop control in DCS & in the field

Loop control in positioner

S g e oop co t o CS & t e e d

Loop control in positioner

1. AI are executedstart unscheduled communication

2. AI is communicating OUT to PID3. PID is executed4. AO is executed and moving valve into committed position

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Single loop control in DCS & in the field

Loop control in positioner

S g e oop co t o CS & t e e d

Loop control in positioner

Source: ARC White paper “The business value proposition of CIF”

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Single loop control in DCS & in the field

Summary:

S g e oop co t o CS & t e e d

Summary:

High flexibility for automation strategiesRelie ed b s comm nication ith CIFRelieved bus communication with CIFRelieved controller with CIFThe faster the execution time of the function blocks the faster the loop

Improved control performance by CIFFaster sample times Shorter latency (delays) in the read-execute-write cycleE g faster reaction to control disturbancesE.g. faster reaction to control disturbances

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Single loop control in DCS & in the field

Improved control performance by CIF e g faster reaction time

S g e oop co t o CS & t e e d

Improved control performance by CIF, e.g. faster reaction time

Source: ARC White paper “The business value proposition of CIF”

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SummarySu a y

CIF provides increased reliability and availability

CIF i bili d d h d d iCIF variability depends on the used devicesDevices with more function blocks offer more flexibility

Most of the single control loops can be realized in the fieldMost of the single control loops can be realized in the field

CIF can provide better control for fast process loops like pressure and flow loopsand flow loops

In terms of speed and ability to reject disturbances

Independent study of Industrial Systems and Control Ltd. (ICS)Independent study of Industrial Systems and Control Ltd. (ICS) “Control in the Field: Analysis of Performance Benefits”

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Thank You

for your attention!

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