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Industrial Automation Function Block library The programmer chooses the blocks in a block library, similarly to the hardware engineer who chooses integrated circuits out of the catalogue. This library indicates the pinning of each block, its semantics and the execution time. The programmer may extend the library by defining function block macros out of library elements. If some blocks are often used, they will be programmed in an external language (e.g. “C”, micro-code) following strict rules. 42/100 2.3 Programmable Logic Controllers
inary elements AND OR XOR S1 SR R Q0 R_TRIG S1 Q0 and or exclusive-or flip-flop positive edge Industrial Automation IEC 61131-3 library (extract) GT TON IN Q PT ET CTU CU RESETQ PV ET SEL GT greater than LT less than LE less equal timer on delay up counter (CTD counter down) selector The number of inputs or outputs and their type is restricted. analog elements ADD SUB MUL DIV INT PV Init The execution time of each block depends on the number of inputs and on the processor. adder subtractor multiplier divider integrator 43/100 2.3 Programmable Logic Controllers
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2005 March, HK courtesy ABB 2. Inst
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Industrial Automation The instrumen
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2.1 Instrumentation 2.1.1 Market 2.
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Industrial Automation Binary Signal
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Industrial Automation Precision: re
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Industrial Automation Variable diff
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Industrial Automation Small positio
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Industrial Automation Force measure
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courtesy Parker Motion & Control In
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Industrial Automation 2.1.3.2 Tempe
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Thermo-element (Thermocouple) two d
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•pulsed laser •load cell •pul
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Other means: Magnetic-dynamic Corio
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Industrial Automation Drives (varia
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Pumps, valves, rods,… Industrial
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Industrial Automation Transducer A
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Object measurand Transducer Industr
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Piping and Instrumentation Diagram
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Square root extraction of the input
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Connection to process, or instrumen
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Industrial Automation German IP-Pro
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Industrial Automation European Expl
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Industrial Automation Assessment Ho
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2005 March, HK set point Control of
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140 120 2 1 180 3 5 200 4 Why do we
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Industrial Automation Controllers T
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Industrial Automation Modeling: Con
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set-point (solicited) Sollwert vale
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Steam ∆P ∆f Main steam valve Ac
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Industrial Automation Two-point con
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value % 1.20 1.00 0.80 0.60 0.40 0.
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Industrial Automation A glance back
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The Watts "governor" (1791) - the f
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Industrial Automation Plant model f
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m(t), y 0 (t) 2 1.5 1 0.5 0 -0.5 co
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u 0 (t), y 0 (t) 2 1.8 1.6 1.4 1.2
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controller gain set-point u 0 error
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PID-Controller (Proportional-Integr
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time domain Laplace domain Industri
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Industrial Automation Programming e
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Industrial Automation IEC 61131-3 e
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Industrial Automation Limitations o
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