An Introduction to Python and Computer Programming by Yue Zhang

By Yue Zhang

This ebook introduces Python programming language and basic ideas in algorithms and computing. Its audience comprises scholars and engineers with very little historical past in programming, who have to grasp a pragmatic programming language and study the elemental considering in laptop science/programming. the most contents come from lecture notes for engineering scholars from all disciplines. This ebook introduces the underlying Python implementation of quantity, string, checklist, tuple, dict, functionality, type, example and module gadgets in a constant and easy-to-understand approach, making task, functionality definition, functionality name, mutability and binding environments comprehensible inside-out. by means of giving the abstraction of implementation mechanisms, this publication builds a pretty good figuring out of the Python programming language.

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I/O address assignment. Device Internal Description TMR1 CR1 CR2 TMR1 TMR2 CR3 1000 — — 1001 1002 1003 Used to trap TMR1 Same as SOL1 (030) Same as SOL2 (031) Timer TMR1 Timer TMR2 Replace CR3 Table 9. Internal address assignment. Register 4000 4001 4002 4003 Description Preset timer count for 3 sec Accumulated count timer 1001 Preset timer count for 2 sec Accumulated count timer 1002 Table 10. Register assignment. 1 TMR2 1002 CR3 1003 005 TMR2 PS2 1002 005 CR3 1003 SOL3 032 SOL3 032 Figure 24.

The internal address assignment table records the locations and descriptions of internal outputs, registers, timers, counters, and MCRs. - The register address assignment table lists all of the available PLC registers. • Certain parts of the system should be left hardwired for safety reasons. Elements such as emergency stops and master start push buttons should be left hardwired so that the system can be disabled without PLC intervention. • Special cases of input device programming include the program translation of normally closed input devices, fenced MCR circuits, circuits that allow bidirectional power flow, instantaneous timer contacts, and complicated logic rungs.

If the stop push button is pressed, the motor will turn OFF. Note that the stop push button is wired as normally closed to the input module. Also, the starter coil’s overloads are wired in series with the coil. In a PLC wiring diagram, the PLC is connected to power lines L1 and L2 (see Figure 28). The field inputs are connected to L1 on one side and to the module on the other. The common, or return, connection from the input module goes to L2. The output module receives its power for switching the load from L1.

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