Maintenance Model 6DS-SP Planarizer
5 - 6 Version 4.0 - February 1998
I/O AND INTERFACE SYSTEM
The I/O and interface system hardware used in the machine form an industrial
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 and outputs are of one of two possible voltage
levels, either zero volts or +24 volts, to represent a device condition as either
"on" or "off". Digital outputs are used to turn on or off solenoids and relays
throughout the machine. Digital inputs monitor such switches and sensors as the
control panel pushbuttons and bridge limit switches. Analog inputs and outputs
are used for devices that have a range of values represented by varying voltage
or current levels (for example, the spindle force load cells, the slurry pH
transmitters, and the DC motor drive boards).
A high speed interface adapter card resides in one expansion slot of the control
computer, interfacing the computer motherboard to the I/O bus and conveying
input and output instructions from the control computer for specific I/O points. As
shown in engineering drawing 217946EM, six I/O racks are mounted on the
machine back panel located inside the right side electrical cabinet. They are
identified as the Digital I/O Mounting Racks 1MR, 2MR, 3MR, and 4MR, the 8
Analog I/O Mounting Rack, and the 16 Analog I/O Mounting Rack. 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 modules are used on the racks. The
modules are individually listed and identified with accompanying part numbers on
engineering drawing 217946EM. All six I/O mounting racks and the interface
adapter card inside the control computer are chained together with a single 50
conductor ribbon cable, establishing a communication bus line between all I/O
mounting racks and the control computer. The control computer makes all
software decisions and provides instructions concerning the individual I/O points.
The brain boards of the six mounting racks implement the instructions.
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