Terminology – Rockwell Automation 1791ES-IB16 Guard I/O EtherNet/IP Safety Modules User Manual
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Rockwell Automation Publication 1791ES-UM001D-EN-P - May 2013
Preface
You can view or download publications at
ttp://www.rockwellautomation.com/literature/
. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or
Rockwell Automation sales representative.
About the Specifications and
Dimensions in This Manual
Product specifications and accessories can change at any time based on
improvements and other reasons. Consult with your Rockwell Automation
representative to confirm actual specifications of purchased product. Dimensions
and weights are nominal and are not for use for manufacturing purposes, even
when tolerances are shown.
Terminology
Refer to the table for the meaning of common terms.
GuardLogix Safety Application Instructions Safety Reference Manual, publication
Provides reference information describing the GuardLogix Safety Application Instruction
Set.
Ethernet Design Considerations Reference Manual, publication
Describes the required media components and how to plan for and install these required
components.
ODVA Media Planning and Installation Manual, publication
ODVA.org
Describes the required media components and how to plan for and install these required
components.
Resource Description
Term
Definition
Connection
Logical communication channel for communication between nodes. Connections are maintained and controlled between masters and slaves.
EDS
Acronym for electronic data sheet, a template that RSNetWorx software uses to display the configuration parameters, I/O data profile, and connection-type
support for a given I/O module. These are simple text files used by RSNetWorx software for you to identify products and commission them on a network.
L-
Output +24V DC common.
M
Sinking output common channel, output switches to the common voltage.
MTBF
Acronym for mean time between failure, the average time between failure occurrences.
ODVA
Acronym for Open DeviceNet Vendor Association, a nonprofit association of vendors established for the promotion of CIP networks.
P
Sourcing output channel, output switches to the plus voltage.
PFD
Acronym for probability of failure on demand, the average probability of a system to fail to perform its design function on demand.
PFH
Acronym for probability of failure per hour, the probability of a system to have a dangerous failure occur per hour.
Proof test
Periodic test performed to detect failures in a safety-related system so that, if necessary, the system can be restored to an as-new condition or as close as
practical to this condition.
S+
Output +24V DC.
SNN
Acronym for safety network number, which uniquely identifies a network across all networks in the safety system. You are responsible for assigning a
unique number for each safety network or safety sub-net within a system.
Standard
Devices or portions of devices that do not participate in the safety function.