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Tài liệu Programmable logic controllers Basic level TP301 – Textbook ppt
Ngày tải lên :
22/12/2013, 18:16
... entirely different programming.
Since 1992, an international standard now exists for programmable logic
controllers and associated peripheral devices (programming and diag-
nostic tools, testing ... the logic operations shown in the previous section are not enough
to adequately describe a status in control technology.
Very often, there is a combination of different logic operations. The logic ... parts
Fig. B3.13
Truth table
Learning System for Automation and Technology
093311
Programmable logic
controllers
Basic level TP301 – Textbook
TP
IN
PT
Q
TP_1Y1
T#5s
ET
S1 1B1 1Y1
&
S1
TP
IN
PT
Q1Y1
TP_1Y1
1B1
T#5s
ET
1A1
42
53
1
1V1
1Y1
...
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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 ... inside the controller
Program
PLC
Inputs Outputs
Figure 1.3: A programmable logic controller.
www.newnespress.com
Programmable Logic Controllers 3
Pipe connections, that is, the inlet and output...
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Programmable logic controllers 5ed P2
Ngày tải lên :
10/04/2014, 14:12
... 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, ... states
of the inputs, as with the machine “interlock,” it is termed a combinational logic system.
Useful combinational logic systems, which we will meet in Chapter 5, are the AND gate, the
OR gate,...
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Programmable logic controllers 5ed P3
Ngày tải lên :
10/04/2014, 14:14
... such as those of 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 ... (Figure 5.24c).
5.6.1 Logic Gates
Programs are often concerned with logic gates. Two forms of standard circuit symbols are
used for logic gates, one originating in the United States and the other ... Processing 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...
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Programmable logic controllers 5ed P4
Ngày tải lên :
10/04/2014, 14:16
... when two different sets of input conditions are realized.
We might just program this as an AND logic gate system; however, if a number of inputs
have to be checked in order that each of the input ... one master
control relay (MCR), a second master control relay (MCR) is used with no contacts or logic
preceding it. It is said to be programmed unconditionally.
The representation used for MCRs...
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Programmable logic controllers 5ed P5
Ngày tải lên :
10/04/2014, 14:18
... count-up (CU) enable bit is 1 when the input logic makes the up-
counter rung 1 and 0 when the rung is 0. The count-down (CD) enable bit is 1 when the
input logic makes the down-counter rung 1 and ... TB
P = 10
O0,0
00010 TON T001
X001
Y020
(c) (d)
(e)
The enable bit EN is set to 1
when there is a logic path to
the timer. The done bit DN
indicates the status of the
timer and is set to 1 when ... long a
particular operation took). The Allen-Bradley timers have three Boolean bits for ladder
logic control: a timer enable bit (EN), which goes on when the timer accumulator is
incrementing,...
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CHƯƠNG 1 CÁC THIẾT BỊ LOGIC LẬP TRÌNH ĐƯỢC (Programmable Logic Device) pdf
Ngày tải lên :
19/03/2014, 21:20
... Logic Device
PLA = Programmable Logic Array (mảng logic lập trình được)
PAL = Programmable Array Logic (logic mảng lập trình được)
LCA = Logic Cell Array (Mảng tế bào logic)
* Thiết ... nạ)
P = Programmable (lập trình được, khả lập trình)
EP = Erasable and Programmable
EEP = Electrically Erasable and Programmable (xóa và lập trình bằng điện)
PLD = Programmable Logic Device ... đoạn PAL
Chú ý :
PLD (Programmable Logic Device)
1.
PLD TOÅ HÔÏP (COMBINATIONAL PLD)
1.1 Dãy logic lập trình được (PLA – Programmable Logic Array)
PLA thực hiện cùng chức năng...
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Tài liệu Kỹ thuật điện tử - Kỹ thuật số -Mạch logic thuần tự (phần1) pdf
Ngày tải lên :
23/12/2013, 06:16
... nghệ BCVT
Khoa Kỹ Thuật Điện Tử II
Bai giang Ky Thuõt Sụ
CHNG 5: MCH LOGIC TUN T
ã
Cú thể mô tả hoạt động của các mạch logic tuần tự bằng biểu đồ
trạng thái (state diagram):
–
Vòng tròn mô ... MẠCH LOGIC TUẦN TỰ
Các dạng xung kích CK
Học viện công nghệ BCVT
Khoa Kỹ Thuật Điện Tử II
Bài giảng Kỹ Thuật Số
Flip-flop RS chính phụ (MS- Master- Slave)
CHƯƠNG 5: MẠCH LOGIC ... Q\
0 0 Cấm
CHƯƠNG 5: MẠCH LOGIC TUẦN TỰ
S=0, R=0
Cả 2 cổng NAND đều có ngõ vào là 0 nên ngõ ra là 1, đây là
điều kiện không mong muốn vì đã quy ước Q và Q\ có trạng
thái logic ngược nhau.
Vì vậy...
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