INDUSTRIAL INDEXING SYSTEMS, INC. IB-11B012
MOTION CONTROL SYSTEM, MSC-250 USER'S GUIDE
AUGUST 1998 GLOSSARY A - 1
APPENDIX A - GLOSSARY
Actuator: 1. A device used to supply a signal causing the controller to
initiate the specified sequences.
2. A device (such as a motor) which creates mechanical
motion by converting various forms of energy to mechanical
energy.
ASCII: American Standard Code for Information Interchange
BAUD: The number of bits per second that can be transmitted in
computer communications.
BCD: Binary Coded Decimal System. A system of number
representation in which each digit of a decimal number is
represented by a binary number.
Check Sum: A sum of digits or numbers used in a summation check. (A
summation check is an error-detecting procedure involving
adding together all the digits of some number and comparing
this sum to a previously computed value of the same sum.)
Closed Loop: A regulating device in which the actuator position is sensed,
and a signal proportional to this position (feedback position) is
compared with a signal proportional to the desired actuator
position (command position). The difference between these
signals is the error signal. The error signal causes a change in
the actuator so as to force this difference to be zero.
Communications: The transmission of information from one device to another.
The information can take many forms such as command
signals, device status, and fault conditions.
Comparator: A device where the feedback signal is subtracted from the
command signal. The difference output of the comparator is
called the error signal.
Controller: The device which receives data from various input devices and
issues commands to the drive.
Daisy Chain: A means of connecting devices to a central processor by
input/output buses which transmit in both directions
simultaneously.
Edge triggered: An electronic circuit which must sense the initial change in a
voltage before it is actuated.
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