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5 ESSENTIAL FACTORS TO CONSIDER WHEN IMPLEMENTING PROFIBUS/PROFINET
Paul ChappleTechnical ManagerMurrelektronik Ltd
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Paul Chapple / 5 Essential Factors…
5 ESSENTIAL FACTORS
IO types & Locations
Environment
Topology and Cabling
Reaction / Cycle Times
System Life-cycle
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1. IO TYPES & LOCATIONS
Visually ‘Scan’ the installationLook for IO points, not modules
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1. IO TYPES & LOCATIONS
Group IO/Devices and Layout systemPLC / ControllerAnalogue / Digital IOMotors / Drives / HMI
Choose Profibus/Profinet slaves to suit your machine architecture
Panel mount / field mountWired / pluggable
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INFEED TABLE HEAD OUTFEED
CONTROL PANEL
28 DI
16 DO
1 valve island
2 motor
32 DI
32 DO
2 RTD
1 motor
24 DI
8 DO
4 AI (U)
2 TH K
28 DI
16 DO
1 valve island
2 motor
32DI 32DO
Paul Chapple / 5 Essential Factors…
2. ENVIRONMENT
Ambient temperatureMost industrial products ~ 0 to 55oC
Don’t forget conducted heat
HumidityChemicals / fluids (water, acid, oil, salt, cleaning agents)Explosive atmosphere (ATEX)Wash-down requirements
IP65 – hose pipe
IP67 – water proof
IP68 – more than IP67
IP69K – F&B wash-down
Shock & VibrationNoise/Interference
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Paul Chapple / 5 Essential Factors…
Most Profibus / Profinet problems are physical!
Consider suitable housing / connector styles
Profibus-DP Line (and Star Topology)
Profinet Star (and Line Topology)
3. TOPOLOGY / CABLING6
Paul Chapple / 5 Essential Factors…
Repeater
SwitchSwitch
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Best installation practices
Segregate bus / power
Use good quality cable
Pre-made connectors
Quality self-wire connectors
Equipotential Bonding
Cable Shielding
3. TOPOLOGY / CABLING7
Paul Chapple / 5 Essential Factors…
4. REACTION / CYCLE TIMES
How fast is fast enough? 12Mb/s, 100Mb/s, … …
System cycle time typically made up of :-Controller CPU scan time 10-100ms
Real time Network 1-20ms
IO Device 1-10ms
IO <1ms
Plant reaction time variable
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RT ~ 5-20msPaul Chapple / 5 Essential Factors…
4. REACTION / CYCLE TIMES
Understand application limitations, e.g. :-High node countsLong Profibus/net cablesProcess demands
Improve reaction times by:-Using high quality network cablesBest installation practices
Cable routes
Equipotential grounding / bonding
Pre-moulded cables
Reducing size/split networkIncreasing Profibus speedNetwork analysis / health check
Understand what your process actually requires, or risk adding unnecessary cost.
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Paul Chapple / 5 Essential Factors…
5. SYSTEM LIFE-CYCLE10
Reduced cabling
Fewer terminations
Expandable
Diagnostics
Pluggable
Pre-tested
Pluggable
IO Diagnostics
Bus diagnostics
Fewer failure points
Paul Chapple / 5 Essential Factors…
5. SYSTEM LIFE-CYCLE
What is critical to you?Material costTime to installTime to testTime to reinstall/commission on-siteReliabilityMaintainabilityFuture-proofAll of the above
Profibus / profinet designed for your applications
Open vendor competition / securityPluggable reduces wiring / reinstallDiagnostics speed up testing / commissioningReliability Longevity & experience
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Paul Chapple / 5 Essential Factors…
5. SYSTEM LIFE-CYCLE
Who will maintain the system?Service contract / warrantyLocal engineers
Where is the system?UK / global
Cost of down-timeReputation for reliability
Profibus/Profinet advanced diagnosticsNetwork statusSlave statusPlant statusVisualisation‘What-If’ – e.g. a sensor short-circuits
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Information in the hands of those that need it – operators/maintenance
Paul Chapple / 5 Essential Factors…
Application Focused Product
Profibus Installed nodes > 45 millionProfinet installed nodes > 4 million
Profibus products > 2,500Profinet products > 600
Wide range of product functionality / package style / suppliers, all tested / certified for interoperability
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Paul Chapple / 5 Essential Factors…
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Paul Chapple / 5 Essential Factors…
Training for network members
Training is available in a range of areas to upgrade your skills including:
Certified PROFIBUS Engineer – combining installation, commissioning and
engineering
PROFIBUS System Design Course
Certified PROFINET Engineer – combining installation, commissioning and
engineering
PROFINET Developer Course
Training can be undertaken at the PROFIBUS International Competence Centre in Manchester, on your company premises or at an off-site location of your choice
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Paul Chapple / 5 Essential Factors…
Training for network members
PROFIBUS and PROFINET training is offered through:
PROFIBUS International Competence Centre
- Manchester Metropolitan University in Manchester
or a location of your choice
(http://www.sci-eng.mmu.ac.uk/ascent/)
PROFIBUS on-site training is offered through:
PROFIBUS International Training Centre
- Verwer Training & Consultancy Ltd
(http://verwertraining.com/)
Our training partners