Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 200)

Glossary

Appendix B

B7

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

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 200