
Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016
9
Preface
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
See this table for the meaning of common terms.
Term
Definition
1732ES modules
Also known as ArmorBlock® Guard I/O™ EtherNet/IP Safety Modules.
1791ES modules
Also known as CompactBlock™ Guard I/O EtherNet/IP Safety Modules.
Connection
Logical communication channel for communication between nodes. Connections are maintained and controlled between masters and slaves.
DLR
Acronym for Device Level Ring, a type of network topology.
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-
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.
NAT
Acronym for network address translation, a service that lets modules reuse IP addresses throughout a network.
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+
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.
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