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symbolic addressing A method of addressing that provides an ASCII interpretation of the tag name.
system reaction time The worst case time from a safety-related event as input to the system or as a
systematic capability (SC) A confidence that the systematic safety integrity meets the requirements of the
task A scheduling mechanism for executing a program. A task provides scheduling
test edits Once online edits have been accepted, there are two versions of user logic
timeout multiplier This value determines the number of messages that can be lost before declaring
undetected failure A failure that is undetected by diagnostic tests, proof tests, operator
untest edits Once online edits have been accepted, there are two versions of user logic
valid connection Safety connection is open and active, with no errors.
fault within the system, until the time that the system is in the safe state. System
reaction time includes sensor and actuator Reaction Times, Input and Output
Reaction Times (including network connection delays), and the Controller
Reaction Time.
specified safety integrity level (SIL). (from IEC 61508-4)
and priority information for a set of one or more programs that execute based
on a certain criteria. Once a task is triggered (activated), all programs assigned
(scheduled) to the task execute in the order in which they are displayed in the
controller organizer.
residing in controller memory. The Test Edits command in the Studio 5000
Logix Designer application causes the controller to execute the new, edited
version of user logic. The original, unedited version of user logic is still in
controller memory, but is not executed. See
a connection error. See also
intervention, or through normal operation.
residing in controller memory. The Untest Edits command in the Studio 5000
Logix Designer application causes the controller to execute the original,
unedited version of user logic. The new, edited version of user logic is still in
controller memory, but is not executed. See
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
untest
edits.
network delay
multiplier.
test
edits.
Glossary
107
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