Grafcet/SFC can be converted directly to ladder logic: 0. Assign one ... button
remote control. - when the ... The behavior of the garage door controller is as
follows:
Relay-type instructions. Example: Ladder diagram. Page 12. Chap. 3 - PLC
Programming languages. IST / DEEC / API. Page 13. AND. AND of the operand
with ...
of watershed contours and is successfully applied to a set of different types of patterned ... Moreover, the cracks or contours of the polygons appear sometimes darker and other times ... the MOC instrument are not well defined in some locations due
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Resumenâ Este artÃculo presenta un enfoque para un API. Transparente basado en Lentes Mágicas. Los lentes mágicos son fi ltros móviles que se desplazan ...
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IST / DEEC / API. Grafcet/SFC can be converted directly to ladder logic: ...
GRAFCET Practice Problem 1 ... The behavior of the garage door controller is as
follows:.
IST / DEEC / API
Industrial Automation (Automação de Processos Industriais)
GRAFCET (Sequential Function Chart) 2/2 http://users.isr.ist.utl.pt/~jag/courses/api1213/api1213.html
2011-2013 Prof. José Gaspar Page 1
IST / DEEC / API
Syllabus: Chap. 3 – PLC Programming languages [2 weeks] ... Chap. 4 - GRAFCET (Sequential Function Chart) [1 week] The GRAFCET norm. Elements of the language. Modelling techniques using GRAFCET. ... Chap. 5 – CAD/CAM and CNC Machines [1 week]
Page 2
Chap. 4 - GRAFCET
IST / DEEC / ACSDC API
PLC Programming languages (IEC 1131-3) Ladder Diagram
Structured Text If %I1.0 THEN %Q2.1 := TRUE ELSE %Q2.2 := FALSE END_IF
Sequential Function Chart (GRAFCET) 1
Instruction List LD AND ANDN OR ST
%M12 %I1.0 %I1.1 %M10 %Q2.0
m
(1)
2
Right b
(2)
3
Load p
(3)
4 (2)
Left a
Page 3
IST / DEEC / API
GRAFCET vs Ladder
Grafcet/SFC can be converted directly to ladder logic: 0. Assign one Boolean variable to each step (si) and transition (tj) 1. Initialize steps and transitions 2. Check transitions 3. Perform activities for steps 4. Enable transitions Ref: [Hugh Jack 2008]
Page 4
IST / DEEC / API
1. Initialize steps and transitions
Note: L = Latch (set coil) U = Unlatch (unset coil)
Page 5
IST / DEEC / API
2. Check transitions
Page 6
IST / DEEC / API
3. Perform activities for steps
Page 7
IST / DEEC / API
4. Enable transitions
Page 8
IST / DEEC / API
GRAFCET Practice Problem 1 Draw one SFC for one stamping press that can advance and retract when a cycle button is pushed, and then stop until the button is pushed again. The press has limit switches indicating stop advancing and stop retracting. Further study: discuss the advantages of using SFC as compared with using Ladder in this problem. From [Hugh Jack 2008] Page 9
IST / DEEC / API
GRAFCET Practice Problem 2 Develop one SFC for a two person assembly station. The station has two presses that may be used at the same time, independently. Each press has a cycle button that will start the advance of the press. A bottom limit switch will stop the advance, and the cylinder must then be retracted until a top limit switch is hit. The two presses are enabled only after a common starting procedure.
From [Hugh Jack 2008]
Page 10
IST / DEEC / API
GRAFCET Practice Problem 3 Design a garage door controller using an SFC. The behavior of the garage door controller is as follows: - There is a single button in the garage and a single button remote control. When the button is pushed the door will move up or down. - There are top/bottom limit switches to stop the motion of the door. - If the button is pushed once while moving, the door will stop. A second push will start motion again in the opposite direction. - There is a light beam across the bottom of the door. If the beam is cut while the door is closing the door will stop and reverse. - There is a garage light that will be on for 5 minutes after the door opens or closes.
