Strasbaugh nTellect (Model 7AF) Wafer Grinder
5 - 6 Version 1.2 - June 2004
I/O AND INTERFACE SYSTEM
The I/O and interface system hardware used in the machine form an industry standard
optically isolated I/O system. This system incorporates brain boards, driver modules,
and a host computer interface card to read or drive all digital and analog signals.
Digital inputs are 24 volt DC; outputs are 24 volt DC. Digital outputs are used to
turn on or off solenoids and enable servo amplifiers throughout the machine. Digital
inputs are such switches and sensors as the control panel push buttons and limit
switches. Analog inputs and outputs are used for devices that have a range of values
represented by varying voltage or current levels. A high speed interface adapter card
resides in one expansion slot of the control computer. It interfaces the computer
motherboard to the I/O bus, allowing input and output instructions from the control
computer for a specific I/O point. Shown in the engineering drawings, there are a total
of five I/O racks. Four racks are mounted on the pull out shelf above the control
computer (behind door 7); the single analog rack is mounted behind door 8. They are
identified as digital or analog inputs and outputs. Each I/O mounting rack has a brain
board. The I/O mounting racks hold the individual I/O driver modules; several types
of driver module types are used on these racks. They are individually listed and
identified with accompanying part numbers on the engineering drawings. All five I/O
mounting racks and the interface adapter card inside the control computer are chained
together with a single 50 conductor ribbon cable. This establishes a communication
bus line between all I/O mounting racks and the control computer. The control
software makes all decisions and instructions concerning the individual I/O points.
The brain boards of the mounting racks implement the instructions.
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