Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 161)

Glossary
Appendix D
DĆ3
Half duplex: A mode of data transmission capable of
communicating in two directions, but only in one direction at a
time.
Hardware: The mechanical, electrical, and electronic devices
which compose a programmable controller and its application.
Hexadecimal numbering system: A numbering system that
uses the numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and the letters A, B, C,
D, E, F to represent numbers and codes. Base 16.
Information: Data that has been processed into a meaningful
form. It adds to a representation and tells the recipient
something that was not known before. Information Should be
timely, accurate, and complete; it reduces uncertainty. Contrast
with data.
Integer: Any positive or negative counting number or zero.
Intelligent terminal: A computer-oriented terminal that has
built-in, data-checking capabilities and a small memory.
Special functions may also be built into the terminal to perform
certain checks on the data or to handle certain kinds of
transactions.
Interfacing: A method of interconnecting the 1775-S4B
scanner with various devices through the use of cables.
I/O: Input/Output
I/O chassis: An assembly used to house I/O modules.
Jumper: A short length of conductor used to make a
connection between terminals.
Ladder diagram mode: Direct operation of the 1775-S4B
scanner through the ladder diagram program. The MSG
instruction can be used to print out or execute a procedure at an
RS-232-C device connected to the 1775-S4B scanner’s channel 5
connector.
Ladder diagram programming: A method of writing a PLC-
3 application program in a format similar to a relay ladder
diagram.
LED: Light-Emitting Diode.
LIST: A menu-driven program that is used to set the operating
parameters for the PLC-3 programmable controller.