Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 200)

Glossary
Appendix B
BĆ7
the application cycle, certain data files are compared to the data table.
whenever a discrepancy is detected, a printed report describes the type of
problem and its location.
False
As related to PC instructions, a disabling logic state. Fault
Any malfunction which interferes with normal application operation.
Feedback
The signal or data sent to the PC from a controlled machine or process to denote
its response to the command signal.
Fence Codes
Special user-programmed PC instructions which control and delimit specific
program areas such as fault zones and conditional ignore zones.
Force Off Function
A feature which allows the user to de-energize, independent of the PC program,
any input or output by means of the program panel.
Force On Function
A feature which allows the user to energize, independent of the PC program,
any input or output by means of the program panel.
Get Byte Instruction
A PC instruction which accesses either the upper or lower 8-bit byte of an
addressed 16 bit data table word. This instruction functions only with limit test
instructions.
Hard Contact
Any type of physical switch contacts. Contrasted with electronic switching
devices, such as triacs and transistors.
Hard Copy
Any form of printed document such as ladder diagram program listing, paper
tape, or punched cards.
Hardware
The mechanical, electrical and electronic devices which compose a
programmable controller and its application.
Image Table
An area in PC memory dedicated to I/O data. Ones and zeroes (“1” and “0”)
represent on and off, respectively, conditions. During every I/O scan, each input
controls a bit in the input image table; each output is controlled by a bit in the
output image table.
Immediate Input Instruction
A PC instruction that immediately transfers input data from selected input