A first look at Dylan.Classes,functions,and modules by Strassman S.

By Strassman S.

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The medium (64 to 1024 I/O), large (512 to 4096 I/O), and very large (2048 to 8192 I/O) PLCs complete the segmentation. Figure 1-14 shows several PLCs that fall into this category classification. The A, B, and C overlapping areas in Figure 1-13 reflect enhancements, by adding options, of the standard features of the PLCs within a particular segment. These options allow a product to be closely matched to the application without having to purchase the next larger unit. com 22 SECTION Introductory 1 Concepts Introduction to Programmable Controllers CHAPTER 1 (a) Courtesy of PLC Direct, Cumming, GA Courtesy of Mitsubishi Electronics, Mount Prospect, IL covers, in detail, the differences between PLCs in overlapping areas.

5 3 2 6 BCD Output To PLC 0101 0011 0010 0111 Figure 2-14. A 4-digit TWS using a 16-bit register to store BCD values. EXAMPLE 2-1 Illustrate how a PLC’s 16-bit register containing the BCD number 7815 would connect to a 4-digit, seven-segment display. Indicate the most significant digit and the least significant digit of the sevensegment display. SOLUTION Figure 2-15 illustrates the connection between a 16-bit register and a 4-digit, seven-segment display. The BCD output from the PLC register or word is sent to the seven-segment indicator through an output interface during the write, or update, section of the scan.

Aluminum Making. Controllers monitor the refining process, in which impurities are removed from bauxite by heat and chemicals. The system grinds and mixes the ore with chemicals and then pumps them into pressure containers, where they are heated, filtered, and combined with more chemicals. POWER Plant Power System. The programmable controller regulates the proper distribution of available electricity, gas, or steam. In addition, the PLC monitors powerhouse facilities, schedules distribution of energy, and generates distribution reports.

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