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Address 0001 0002 0003 0004 0005 0006 0007 0008 0009 000A 000B 000C 000D 000E 000F 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 001A TABLE 9.2 Command DB 10 FE 00 CA 14 00 FE 01 C2 00 00 3E 00 D3 11 C3 00 00 3E 01 D3 11 C3 00 00
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Description Port I (address 10) to the actuator Compare accu = 0000 0000 If accu = 0000 0000 jump to address 14 If accu does not = 0000 0000 jump to address 00 If accu does not = 0000 0001 jump to address 00 Load 000 000 into accu Bring accu to port O (address 11) Jump to address 00
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Load 0000 0001 into accu Bring accu to port O (address 11) Jump to address 00
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Once the program has been developed and tested, there is no further need to use a keyboard and display. Thus, these components can now be disconnected from the system. They do not need to be reconnected until program editing becomes necessary. The editing task and program statement change is usually designated to a qualified administrator or by the Information Technology personnel. It always is a good practice to transfer a completed program from a RAM to a memory whose contents are retained even when the supply
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voltage is switched off. An electrically programmable ROM (EPROM) could be used. Therefore, the RAM is replaced by an EPROM chip on the PC board. Sometimes it is necessary to develop extensive programs, thus, comprehensive knowledge and considerable experience are needed. Programs in machine code, as a hexadecimal sequence of alphanumerics, are very complex, difficult to read and document, and hard to test.
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A microcomputer interactive development system consists of the following key elements as illustrated in Fig. 9.5: Software Bulk storage (floppy disk, permanent disk, or other storage) Monitor Keyboard for interaction and data entry Printer In principle, there are two methods of developing the communication software for an interactive control system: The interactive system is located near and directly connected to the installation workstation so that the development may take place directly at the machine under real conditions. The interactive system is located away from the installation workstation. In this case, the installation must be totally or partially simulated, otherwise the system must be connected to the installation from time to time.
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FIGURE 9.5
Microcomputer interactive development system.
Communications
Input device Additional input devices e.g. mouse Interface Keyboard Interface Floppy disk Interface Output device Monitor Interface Printer Plotter Interface Personal computer RAM
Data address control bus ROM Microprocessor Input/Output alignment 24V 5V A D Process interface D A 5V 24V M
Sensors
Actuators
FIGURE 9.6
Microcomputer standard modules.
When the development of the interactive system has been completed, the system will contain a precise image of the hardware and the software, such as programming, memory size, ports, and number of inputs and outputs. The microcomputer system can then be either built as a printed circuit according to customer specifications or assembled from standard modules (Fig. 9.6).
9.5 The Personal Computer as a Single-Board Computer
The personal computer is not a completely new development in computer evolution. It simply represents a new stage in the development of single-board computers. A single-board computer can play a key role in developing active communication and interfaces for workstations since it can be effectively integrated with process computer peripherals using the following steps: 1. Inclusion of a single-board computer and power supply into a housing 2. Replacement of the simple switch or hexadecimal input by a keyboard similar to that of a typewriter 3. Replacement of the simple LED or seven-segment display by a screen with 24 lines and 40 or 80 characters per line
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4. Addition of external mass storage for programs and data (cassette recorder or floppy disk) 5. Connection to a printer or other peripheral device 6. Integration of an interpreter for high-level programming language A microcomputer system with this configuration is often referred to as a personal computer, which is misleading terminology. Although the microprocessor and single-board computer were initially developed for control purposes, the nomenclature directed interest toward purely commercial applications. The personal computer (or single-board computer) is similar to any peripheral device that requires interfacing to communicate with a central control unit to perform control functions. The personal computer s input and output signals must also be adapted and made available to peripheral devices. Control technology employs a variety of signal forms and levels (e.g., with both analog and binary signals and voltages that may be as high as 24 V). The microcomputer operates with internal voltage levels of 0 and 5 V. Thus, interfacing must provide voltage-level conversion and D/A and A/D conversion. Figure 9.6 is a block diagram of a personal computer and its interfacing to process computer peripherals.
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