IB-11B012 INDUSTRIAL INDEXING SYSTEMS, INC.
USER'S GUIDE MOTION CONTROL SYSTEM, MSC-250
A - 2 GLOSSARY AUGUST 1998
Encoder: A type of feedback device which converts mechanical motion
into electrical signals to indicate actuator position. The
encoder typically produces an electrical pattern based on the
interruption of a light source as a printed pattern is rotated
between the source and a sensor. The interruptions are
sensed and converted to electrical pulses. Actuator shaft
position is determined by counting these pulses.
Feedback Device: Device which monitors shaft position by sending signals to the
controller as the shaft rotates.
Flag: A bit in memory used by the programmer to evaluate action to
be taken. A program branch may be executed depending on
the true or false result of a bit test.
Gain: A multiplication factor. When used with the MSC-250
controller, it is the factor used to increase or decrease the
apparent number of counts per revolution.
High True: A binary coded decimal condition where the binary digit "1" is
the high logic voltage.
Home: Absolute 0.00 or the point from which all absolute points are
measured.
Host Computer: A computer system whose function is to monitor and
coordinate the processes of other devices. A host computer
will typically coordinate motion control functions as well as their
interaction with other machine processes.
Index: To move the motor shaft an incremental distance from the
current position.
Initialize: To execute a series of Macroprogram instructions to teach a
MSC axis controller an absolute zero reference.
I/O: Input/Output. (Pertaining to all equipment and activity that
transfers information into or out of a computer or similar device
⎯ such as the MSC-250 controller.)
Least Significant Bit: The bit that carries the lowest value or weight in the binary
notation for a numeral. The right-most bit in the binary word
(notation).
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