Publication 1752-UM001A-EN-P - October 2006
Overview 17
Safety Concept of the
Controller
The SmartGuard 600 controller is certified for use in safety
applications up to and including Safety Integrity Level (SIL) 3,
according to IEC 61508, and Category (CAT) 4, according to EN 954-1,
in which the de-energized state is the safety state. Safety application
requirements include evaluating the probability of failure rates (PFD
and PFH), system reaction-time calculations, and functional
verification tests that fulfill SIL 3 criteria. You must read, understand,
and fulfill these requirements prior to operating a SmartGuard 600
controller-based SIL 3 or CAT 4 safety system.
The controller uses the following mechanisms to support the integrity
of safety data.
• Safety network number (SNN) — A unique number that
identifies the safety network. Each DeviceNet sub-network that
contains safety nodes must have one unique SNN.
• Configuration signature — The combination of an ID number,
date, and time that uniquely identifies a specific configuration
for a safety device.
• Configuration lock (or safety-lock) — After the configuration
data has been downloaded and verified, you can lock the
controller’s configuration to prevent it from being modified.
• Password protection — The controller’s configuration can be
protected by the use of an optional password. If you set a
password, download, locking, unlocking, resetting, and
changing the status of the controller requires a password to
perform.
Additional Resources
Refer to the SmartGuard Controllers Safety Reference Manual,
publication 1752-RM001, for information on SIL 3 and CAT 4 safety
system requirements, including functional verification test intervals,
system reaction time, and PFD/PFH values.
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