6 Rockwell Automation Publication 750-UM002H-EN-P - February 2017
Preface
Conventions
In this manual, configuration parameters are listed by number followed by the
name in brackets. For example, P24 [OverSpd Response].
Terminology
This table defines abbreviations used in this manual.
Abbreviation Full Term Definition
1oo2 One out of Two Refers to the behavioral design of a dual-channel safety system.
CAT. Category Classification of the safety-related parts of a control system in respect of their resistance to faults and
their subsequent behavior in the fault condition, and which is achieved by the structural arrangement
of the parts, fault detection, and/or by their reliability (source EN ISO 13849-1).
CL Claim Limit The maximum SIL rating that can be claimed for a Safety-Related Electrical Control System subsystem
in relation to architectural constraints and systematic safety integrity (source IEC 62061).
EN European Norm The official European Standard.
ESD Emergency Shutdown Systems A system, usually independent of the main control system, that is designed to safely shut down an
operating system.
HFT 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.
HIM Human Interface Module A module used to configure a device.
IEC International Electrotechnical Commission The International Electrotechnical Commission (IEC) is the world’s leading organization that prepares
and publishes International Standards for all electrical, electronic and related technologies.
IGBT Insulated Gate Bi-polar Transistors Typical power switch used to control main current.
ISO International Organization for Standardization The International Organization for Standardization is an international standard-setting body
composed of representatives from various national standards organizations.
PELV Protective Extra Low Voltage An electrical system where the voltage cannot exceed ELV under normal conditions, and under single-
fault conditions, except earth faults in other circuits.
PFD Probability of Dangerous Failure on Demand The average probability of a system to fail to perform its design function on demand.
PFH Probability of Dangerous Failure per Hour The probability of a system to have a dangerous failure occur per hour.
PL Performance Level EN ISO 13849-1 safety rating
SELV Safety Extra Low Voltage Circuit A secondary circuit that is designed and protected so that, under normal and single fault conditions, its
voltages do not exceed a safe value.
SIL Safety Integrity Level A measure of a products ability to lower the risk that a dangerous failure could occur.
STO Safe Torque Off The Safe Torque Off (STO) function is used to prevent unexpected motor rotation in the event of an
emergency while the drive remains connected to the power supply. When STO is activated, the torque
power cannot reach the drive, thus stopping and preventing any motor shaft rotation.
To Next Page
Loading...
Need help?
General
