unicos: unified industrial control system cpc …
TRANSCRIPT
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Industrial Controls Engineering Department
UNICOS: UNIFIED INDUSTRIAL
CONTROL SYSTEM CPC (CONTINUOUS PROCESS CONTROL)
BASIC COURSE
SESSION 3: PLC BASICS
CERN EN/ICE group
UCPC 6 UNICOS-Continuous Process Control
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Industrial Controls Engineering Department
OVERVIEW
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Industrial Controls Engineering Department
Programmable Logic Controller Designed for industrial processes. Works under severe conditions. Real time system. Handles sensors and actuators (I/O).
OVERVIEW
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Industrial Controls Engineering Department
Process control Collects inputs (digital, analog) Runs the process control
Basic logic functions Complex algorithms (PID…) Safety functions
Produces actions (outputs) Provides data to the supervision layer
FUNCTIONS
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Industrial Controls Engineering Department
Reliable. Used for safety systems. Robust. Resistant to electrical noise, vibration,
impact, dust, heat. Extensive range of inputs/outputs. Extensive range of functionalities. Long term support. Long life, around 30 years.
FEATURES
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Industrial Controls Engineering Department
ETHERNET TCP/IP
INDUSTRIAL FIELDBUS
REMOTE I/O
PLC
SENSORS/ACTUATORS
DIRECT WIRING
Supervisory Control And Data Acquisition SCADA
HARDWARE OVERVIEW
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Industrial Controls Engineering Department
Device which converts the signal from one form to another.
Sensors Analog: Temperature, pressure, humidity, level,
flow, weight… Digital: Level, pushbutton (emergency stop),
position switch, photoelectric sensor… Actuators
Analog: valve, pump, heater, power supply… Digital: Signaling column, contactor, electro
valve, switch, OnOff pump…
SENSORS - ACTUATORS
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Industrial Controls Engineering Department
ETHERNET TCP/IP
INDUSTRIAL FIELDBUS
REMOTE I/O
PLC
SENSORS/ACTUATORS
DIRECT WIRING
Supervisory Control And Data Acquisition SCADA
HARDWARE OVERVIEW
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Industrial Controls Engineering Department
Communication modules I/O Modules.
Convert physical value into numeric value and vice versa.
Function modules.
PERIPHERY STATIONS
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Industrial Controls Engineering Department
I/O MODULES
Analog 16-bit signed from -32768 to 32767. Inputs: Resistance, Current, Voltage,
thermocouple… Outputs: Current, voltage.
Digital 1-bit Inputs: 120v-230v AC, 24v DC Outputs: Relay, 120v-230v AC, 24v-48v-125v
DC.
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Industrial Controls Engineering Department
PID control Flow Camera controllers Numerical controllers Counters Positioning
FUNCTION MODULES
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Industrial Controls Engineering Department
Ethernet Profibus CAN Point to Point Serial RS 232, RS 485 AS-Interface Modbus…
COMMUNICATION MODULES
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Industrial Controls Engineering Department
ETHERNET TCP/IP
INDUSTRIAL FIELDBUS
REMOTE I/O
PLC
SENSORS/ACTUATORS
DIRECT WIRING
Supervisory Control And Data Acquisition SCADA
HARDWARE OVERVIEW
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Industrial Controls Engineering Department
Industrial Network System Provides the PLC with I/Os Time deterministic. Saves cabling costs Sensitive to electromagnetic noise. Specific installation rules. Several different (incompatible) fieldbus standards.
FIELDBUS- OVERVIEW
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Industrial Controls Engineering Department
FIELBUS STANDARDS
Profibus Industry leader. 14 million nodes.
WorldFip Robust (radiation resistant)
CAN. CANOpen. CANBus Low cost Easy to implement Used for ELMB at CERN
ProfinetIO Interbus integrated (Phoenix Contact). Ethernet based fieldbus
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Industrial Controls Engineering Department
PROFIBUS
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PROFIBUS
Active nodes. Master
Passive nodes. Slaves.
PLC PLC PC
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Industrial Controls Engineering Department
ETHERNET TCP/IP
INDUSTRIAL FIELDBUS
REMOTE I/O
PLC
SENSORS/ACTUATORS
DIRECT WIRING
Supervisory Control And Data Acquisition SCADA
HARDWARE OVERVIEW
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Industrial Controls Engineering Department
SIEMENS S7-200
S7 200 (low range) Compact Low cost Small systems
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Industrial Controls Engineering Department
S7 300 (medium range) Modular Wide range of IOs Widely used Limited memory Limited range of fieldbuses
SIEMENS S7-300
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Industrial Controls Engineering Department
S7 400 (high range) Redundant architecture Large memory High performance
SIEMENS S7-400
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Industrial Controls Engineering Department
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PROCESS CYCLE
Read inputs
Copy inputs to
Input Process Image
Execute user
program
Copy Output process
Image to outputs
Write outputs
Comm tasks
Cycle time 5-500 ms
Process Cycle
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Industrial Controls Engineering Department
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Traditional ladder logic is an easy-to-use graphical programming language that implements relay-equivalent symbol. Intuitive. Limited functionalities.
PROGRAMMING LANGUAGES
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Industrial Controls Engineering Department
STL: Statement List / Instruction List - Fastest possible logic execution. Low level language (similar to assembly language)
PROGRAMMING LANGUAGES
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Industrial Controls Engineering Department
FBD : Function Block Diagram
PROGRAMMING LANGUAGES
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Industrial Controls Engineering Department
ST: Structured Text - Equations, table manipulation, complex algorithms (If/Then)
PROGRAMMING LANGUAGES
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Industrial Controls Engineering Department
SFC : Sequential Function Chart -A graphical method of representing a sequential control system (stepper).
PROGRAMMING LANGUAGES
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Industrial Controls Engineering Department
ETHERNET TCP/IP
INDUSTRIAL FIELDBUS
REMOTE I/O
PLC
SENSORS/ACTUATORS
DIRECT WIRING
Supervisory Control And Data Acquisition SCADA
HARDWARE OVERVIEW
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Industrial Controls Engineering Department
Ehternet TCP IP. Big amount of data transfer. Non deterministic. Big data transfer rates. S7 Driver on TCP IP. Siemens. OPC.
SCADA COMMUNICATION
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