Allen-Bradley GuardLogix 5580

Rockwell Automation Publication 1756-RM012B-EN-P - April 2018 103
Glossary
The following terms and abbreviations are used throughout this manual. For
definitions of terms that are not listed here, see the Allen-Bradley Industrial
Automation Glossary, publication AG-7.1
.
1oo1 (one-out-of-one) Identifies the programmable electronic controller architecture. 1oo1 is a
single-channel system.
1oo2 (one-out-of-two) Identifies the programmable electronic controller architecture. 1oo2 is a
dual-channel system.
accept edits Action that is taken to accept and download online edit changes. See also
pending edits
.
Add-On Instruction An instruction that you create as an add-on to the Logix instruction set. Once
defined, an Add-On Instruction can be used like any other Logix instruction
and can be used across various projects. An Add-On Instruction is composed of
parameters, local tags, logic routine, and optional scan-mode routines.
assemble edits You assemble edits when you have made online edit changes to the controller
program and want the changes to become permanent, because you no longer
need the ability to test, untest, or cancel the edits.
Average frequency of a dangerous
failure (PFH)
The probability of a system to have a dangerous failure occur per hour.
cancel edits Action that is taken to reject and delete any unassembled online edit changes.
CIP (Common Industrial Protocol) An industrial communication protocol that is used by Logix5000-based
automation systems on EtherNet/IP, ControlNet, and DeviceNet
communication networks.
CIP Safety (Common Industrial
Protocol – safety certified)
SIL 2-rated or SIL 3-rated version of CIP.
configuration signature A number that uniquely identifies the configuration of a device. The
configuration signature is composed of an ID number, date, and time.
detected failure A failure that diagnostic tests, proof tests, operator intervention, or through
normal operation detect.
diagnostic coverage (DC) The ratio of the dangerous detected failure rate to the dangerous failure rate.
European norm. (EN) The official European standard.
get system value (GSV) A user application instruction that retrieves specified controller status
information and places it in a destination tag.
hardware fault tolerance The HFT equals n, where n+1 faults could cause the loss of the safety function.
An HFT of 1 means that 2 faults are required before safety is lost.