Page 533 - Sensors and Control Systems in Manufacturing

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Cha p te r
Ni ne

Next, the computer requires the PLC to switch ON the mixing
motor and to open the bleed valve D. Once the reservoir has been
emptied, the cycle is complete.
A new cycle is now started up with the same or modified refer-
ence values. Data communication between the PLC regulator and the
computer is carried out serially via V-24 interfaces. Computer and
printers communicate via a parallel interface, and computer and
floppy disk, via a parallel IEC interface.

Further Reading
Boyes, G. S., (ed.), Synchro and Resolver Conversion, Memory Devices Ltd., Surrey,
U.K., 1980.
Burr-Brown Corp., “Wiring and Noise Considerations,” The Handbook of Personal
Computer Instrumentation, 4th ed., sec 7, Burr-Brown, Tucson, 1989.
Cole, R., Computer Communications, Macmillan, London, 1986.
Grant, D., “Applications of the AD537 IC Voltage-to-Frequency Converter,” applica-
tion note, Analog Devices Inc., Norwood, Mass., 1980.
Hagill, A. L., “Displacement Transducers Based on Reactive Sensors in Transformer
Ratio Bridge Circuits,” Journal Phys. E: Instrum., 16: 597–606 (1982).
Higham, E. H., Pneumatic Instrumentation in Instrument Technology: Instrumentation
Systems, Butterworths, London, 1987.
Hilburn, J. L., and D. E. Johnson, Manual of Active Filter Design, 2d ed., McGraw-
Hill, New York, 1983.
Huang, S. M., A. L. Scott, and M. S. Green, “Electronic Transducers for Industrial
Measurement of Low Value Capacitances,” Journal of Phys. E: Sci. Instrum., 21:
242–250 (1988).
Netzer, Y., “Differential Sensor Uses Two Wires,” Electronic Design News, 167, March
31, 1982.
Oliver, B. M., and J. M. Cage, “Electronic Measurements and Instrumentations,”
McGraw-Hill, New York, 1971.
Paiva, M. O., “Applications of the 9400 Voltage to Frequency, Frequency to Voltage
Converter,” application note 10, Teledyne Semiconductor, Mountain View,
Calif., 1989.
Tompkins, W. J., and J. G. Webster (eds.), Interfacing Sensors to IBM PC, Prentice-Hall,
Englewood Cliffs, N.J., 1988.