By W. Bolton (Auth.)
, Pages vii-ix
1 - Programmable good judgment controllers
, Pages 1-16
2 - Input—output devices
, Pages 17-43
3 - quantity systems
, Pages 44-52
4 - I/O processing
, Pages 53-79
5 - Ladder and sensible block programming
, Pages 80-107
6 - IL, SFC and ST programming methods
, Pages 108-131
7 - inner relays
, Pages 132-153
8 - bounce and call
, Pages 154-158
9 - Timers
, Pages 159-172
10 - Counters
, Pages 173-188
11 - Shift registers
, Pages 189-196
12 - facts handling
, Pages 197-209
13 - Designing systems
, Pages 210-249
14 - Programs
, Pages 250-275
Appendix - Symbols
, Pages 276-280
, Pages 281-287
, Pages 288-292
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Extra resources for Programmable Logic Controllers
Such a resistance change can be transformed by signal conditioning to give suitable on-off signals. 41 Liquid level monitoring Problems Questions 1 to 10 have four answer options: A, B, C or D. Choose the correct answer from the answer options. 1 Decide whether each of these statements is True (T) or False (F). A limit switch: (i) Can be used to detect the presence of a moving part. (ii) Is activated by contacts making or breaking an electrical circuit. A B C D (i) T (i) T (i) F (i) F (ii) T (ii) F (ii) T (ii) F Decide whether each of these statements is True (T) or False (F).
A negative number of 10110 would be written as 110110. However, this is not the most useful way of writing negative numbers for ease of manipulation by computers. 2 One's and two's complements A more useful way of writing signed negative numbers is to use the two's complement method. A binary number has two complements, known as the one's complement and the two's complement. The one's complement of a binary number is obtained by changing all the ls in the unsigned number into 0s and the 0s into Is.
This is based on the use of the 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. With a number represented by this system, the digit position in the number indicates the weight attached to each digit, the weight increasing by a factor of 10 as we proceed from fight to left. Hence we have: ... 103 thousands Denary 1000 102 hundreds 100 101 tens 10 10~ units 1 Counting can, however, be done to any base. The denary system is just convenient because we have ten fingers. If we had only two then our system for everyday counting would probably have been different.
Programmable Logic Controllers by W. Bolton (Auth.)