programmable logic controllers with controllogix ebook
Tài liệu PLC MELSEC System Q Programmable Logic Controllers
Ngày tải lên :
15/10/2013, 16:28
... step
i
SC
Operation HOLD step (without
transition check)
i
SE
Operation HOLD step (with
transition check)
i
ST
Reset step
i
R
Sn
Block START step (with END
check)
i
Bm
Block START step (without END
check)
i
Bm
Up ... step (with END check) cannot be described immediately before the
coupling of a parallel coupling.
(The block START step (with END check) cannot be used for a wait.)
The block START step (without ... initial step
0
Coil HOLD initial step
0
SC
Operation HOLD step (without
transition check) initial step
0
SE
Operation HOLD step (with
transition check) initial step
0
ST
Reset initial step
When...
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Tài liệu Programmable logic controllers Basic level TP301 – Textbook ppt
Ngày tải lên :
22/12/2013, 18:16
... years. With this type, individual or a number of printed circuit
board modules are in a standardised housing.
The hardware design for a programmable logic controller is such that it
is able to withstand ...
This textbook explains the design of a programmable logic controller and
its interaction with peripherals.
One of the main focal points of the textbook deals with the new interna-
tional standard ... very easily realised with contacting compo-
nents. An actuated normally open contact corresponds to a logic 1-
signal and an unactuated one to a logic 0-signal. When working with
contactless components,...
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Programmable logic controllers 5ed P1
Ngày tải lên :
10/04/2014, 14:10
... answer options.
1. The term PLC stands for:
A. Personal logic computer
B. Programmable local computer
C. Personal logic controller
D. Programmable logic controller
2. Decide whether each of these statements ... washing
cycle is completed.
1.1.2 The Programmable Logic Controller
A programmable logic controller (PLC) is a special form of microprocessor-based controller
that uses programmable memory to store instructions ... Can withstand transient overloads.
Which option best describes the two statements?
A. (i) T (ii) T
B. (i) T (ii) F
C. (i) F (ii) T
D. (i) F (ii) F
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Programmable Logic Controllers...
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Programmable logic controllers 5ed P2
Ngày tải lên :
10/04/2014, 14:12
... number. Thus for the binary number
1010, we have 1 with a place value of 2
3
, 0 with a place value of 2
2
, 1 with a place value of
2
1
, and 0 with a place value of 2
0
, and so the conversion ... 1, and are described as two-state
variables or logical variables. The complete system constructed with such variable is termed
a logic system or logic gates. If the output of such a system depends ... Sequential Logic Systems
With a sequential logic system, the present output is influenced by the history of its past
inputs as well as by its present input. This is unlike a combinational logic system,...
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Programmable logic controllers 5ed P3
Ngày tải lên :
10/04/2014, 14:14
... the logic gates, counters, or
timers, or have functions defined by the user, such as a block to obtain an average value
of inputs (Figure 5.24c).
5.6.1 Logic Gates
Programs are often concerned with ... have the switch in series with the motor and supplied with electrical
power when the switch is closed. The circuit shown in Figure 5.1b is termed a ladder
diagram.
With such a diagram, the power ... 99
pressure sensors, we have an AND logic situation, since both are required if there is to be an
output from the lamp. However, we have an OR logic situation with the test switch in that
it is...
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Tài liệu Logic Design with VHDL doc
Ngày tải lên :
12/12/2013, 09:16
... 1
0
1
10
1
0
10
01
00
11
10
A
BC
C
B
A
F
A
F = AB' + BC + AC
(c) Network with hazard removed
C
E
B
A
D
F
0 1
0
1
10
1
0
10
01
00
11
10
A
BC
F = AB' + BC
1 - Hazard
(a) Network with 1-hazard
B
D
E
F
0 ns 10 ns 20 ns 30 ... [architecture-name];
DFF
CLK D
QQ'
D Q Q
+
0 0 0
0 1 0
1 0 1
1 1 1
Figure 1-10
Clocked D Flip-flop
with Rising-edge Trigger
Q = D
+
NAND:
NOR:
C = (AB)' = A' + B'
C = (A+B)'...
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Tài liệu Logic Synthesis With Verilog HDL part 1 docx
Ngày tải lên :
24/12/2013, 11:17
... designer's mind was used as the
logic synthesis tool, as illustrated in Figure 14-1
.
Figure 14-1. Designer's Mind as the Logic Synthesis Tool
with varied designer styles for the ... the logic synthesis tool to automatically generate a new gate-level
description.
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Logic synthesis tools allow technology-independent design. A high-level
description may be written without ...
The advent of computer-aided logic synthesis tools has automated the process of
converting the high-level description to logic gates. Instead of trying to perform logic
synthesis in their minds,...
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Tài liệu Logic Synthesis With Verilog HDL part 2 doc
Ngày tải lên :
24/12/2013, 11:17
...
initial is not supported
%
+
-
modulus
unary plus
unary minus
Logical !
&&
||
logical negation
logical and
logical or
Relational >
<
>=
<=
greater than
less ... typically accepted by
logic synthesis tools is given in Table 14-1
. The capabilities of individual logic synthesis
tools may vary. The constructs that are typically acceptable to logic synthesis ...
allowed, because equality with x and z does not have much meaning in logic synthesis.
While writing expressions, it is recommended that you use parentheses to group logic the
way you want it...
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Tài liệu Logic Synthesis With Verilog HDL part 3 doc
Ngày tải lên :
24/12/2013, 11:17
... remove redundant logic. Various technology independent
boolean logic optimization techniques are used. This process is called logic optimization.
It is a very important step in logic synthesis, ... internally by the logic synthesis tool in terms of internal data
structures. The unoptimized intermediate representation is incomprehensible to the user.
Logic optimization
The logic is now optimized ... timing
Logic synthesis
The RTL description of the magnitude comparator is read by the logic synthesis tool. The
design constraints and technology library for abc_100 are provided to the logic...
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Tài liệu Logic Synthesis With Verilog HDL part 4 doc
Ngày tải lên :
24/12/2013, 11:17
... RTL descriptions.
Use parentheses to optimize logic structure
The designer can control the final structure of logic by using parentheses to group logic.
Using parentheses also improves readability ... design abstraction and
control over the structure of the logic synthesis output. Designing at a very high level of
abstraction can cause logic with undesirable structure to be generated by the synthesis ... of generating random
logic. However, the final logic structure is not necessarily symmetrical. Instantiation of
basic building blocks creates symmetric designs, and the logic synthesis tool...
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Tài liệu Logic Synthesis With Verilog HDL part 5 pptx
Ngày tải lên :
24/12/2013, 11:17
... chip.
14.8 Summary
In this chapter, we discussed the following aspects of logic synthesis with Verilog HDL:
ã
Logic synthesis is the process of converting a high-level description of the ... circuit elements.
ã
A logic synthesis tool accepts an RTL description, design constraints, and
technology library and produces an optimized gate-level netlist. Translation, logic
optimization, ... blocks reduce the complexity of optimization for the logic
synthesis tool.
ã
Accurate specification of design constraints is an important part of logic synthesis.
High-level synthesis tools allow...
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