The presentation was authored by Giovani Godena, Igor STeiner, Janez Tancek and Marko Svetina, and presented by Steiner.
The presentation content:
ISA-S88.01 and Modular Batch Automation
ISA-S88.01 Batch Control Tools: Configuration
ISA-S88.01 Batch Control Tools: Pros&Cons
PLC Batch Control: Requirements
Concept of Tabular Recipes on PLC
PLC Batch Control: Configuration
PLC Batch Prototype: Features&Use
PLC Batch Prototype: State model
PLC Batch Further Concept Development
ISA-S88.01 defines batch control models & terminology
Separation of:
Product
Process
Equipment
Modular Batch Automation – a framework for:
Flexibility
Reusability
Complexity management
Graphical representation of recipes (SFC)
A number of ISA-S88.01 based tools
ISA 88.01Batch Control Tools Pros and Cons
Pros:
High flexibility&reusability
High level of abstraction for complexity management
Rich functionality
Cons:
Unsatisfactory reliability of the PC platform
Poor adjustment to small and medium projects
Unsatisfactory time behaviour of the PC platform
Too low expressive power of phase behaviour model
Alternative solution: Recipe execution on PLC
Already used in practice
Mostly oversimplified solutions
Too low expressive power
PLC Batch Control Requirements
PC & PLC platform
On PLC all real-time functions (incl. recipe execution)
On PC only non-real-time functions
SFC or tabular recipes representation
Two levels of recipes
Extended phase behaviour model
Simple state propagation mechanism
Portability to various PLC platforms
PLC Batch Prototype Features
Two-level recipes
Procedure, containing Unit procedures
Unit procedure, containing phases
Concurrent recipes
General recipes
Based on Unit Classes
Static Binding (on batch launching)
Extended Phase Behaviour Model
PLC Batch Control: Special Phases
We need them for:
OR branches
Special recipe transition conditions
Special phases are:
Condition
Branch (analog, digital, dialog)
Jump
…
PLC Batch Control: Phase Logic Sequences
State processing sequences:
For durative states (9): Entry, Loop, Exit, Always
For transient states (5): Transient
Transition processing (17)
Theoretical number of sequences: 58
Reduced to maximum 22 sequences
Configurable to between 1 and 22
Result: customizable level of abstraction
PLC Batch Control: State Propagation
Propagation of holding
Upwards
Downwards
Upper level recipes – fixed behaviour:
Downwards (from procedure to unit procedure): YES
Upwards (from unit procedure to procedure): NO
Lower level recipes – two phase parameters:
Propagation from phase to unit procedure
Propagation from unit procedure to phase
PLC Batch Further Concept Development
Dynamic Tables
Graphical (SFC) Recipes
General recipes with Dynamic Binding
Partner phases
Parameter value deferring
……
Leaders relevant to this article: